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fluid drive cooling fan
2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power
stearing unit. The fan drive is activated by what and where is it located??. Where or what sends the signal ??? located?? The fan runs and will cool ,, but only when the temp guage goes over the half way mark . At this temp the jeep is starting to experenceing over heating problems. |
Re: fluid drive cooling fan
Me thinks you do not understand all that you know.
The fan is driven by the fan belt, and is mounted to the pulley affixed to the water pump. The fan is not directly attached to the pulley, it is physically mounted to a viscous couple, and the couple is attached to the pulley that is driven by the fan belt. The viscous couple is designed to firmly secure the fan to the pulley when the air flow througbh the radiator is decreased and the resulting air temp rises at the fan itself. As the vehicle speed increases, the air flow also increases and the temp drops and the fan is released to essentially spin freely. (It does not actually spin freely, but the difference is such that it makes no difference for this discussion.) What you are really noticing is that as you drive slowly in stop-n-go traffic, the temp climbs, and as the traffic flow increases, the engine temp drops again. This is a sign that the viscous coupler (fan clutch) is worn out. Without getting bogged down on specifics, the viscous material expands with heat and presses stuff together inside the coupler to lock the fan to the pulley and provide a positive drive. Another school of though says that the viscous material is forced through holes inside the coupling, and as the viscous material heats up it gets thicker and can not pass through the holes and therefore provides a positive drive force for the fan. No matter which theory you like, the viscous material is not doing its job, and you need a new fan clutch to resolve your problem. When you pull into the driveway and shut off the hot engine, and open the hood, you should find the fan to be difficult to turn by hand. A few hours later, the fan should be easy to turn. If it turns the same, then the clutch is bad and you need a new one. There is no link between the fan drive and the power steering. You are correct, sort of, that the fan is "fluid drive", but it is really not fluid as much as it is more like a jell. The jelly thickens or expands or both to lock a clutch that then drives the fan. Otherwise the fan spins because of the friction but is not physically "driven." <ncflnc@yahoo.com> wrote in message news:1192699324.591587.21110@k35g2000prh.googlegro ups.com... > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. > |
Re: fluid drive cooling fan
Me thinks you do not understand all that you know.
The fan is driven by the fan belt, and is mounted to the pulley affixed to the water pump. The fan is not directly attached to the pulley, it is physically mounted to a viscous couple, and the couple is attached to the pulley that is driven by the fan belt. The viscous couple is designed to firmly secure the fan to the pulley when the air flow througbh the radiator is decreased and the resulting air temp rises at the fan itself. As the vehicle speed increases, the air flow also increases and the temp drops and the fan is released to essentially spin freely. (It does not actually spin freely, but the difference is such that it makes no difference for this discussion.) What you are really noticing is that as you drive slowly in stop-n-go traffic, the temp climbs, and as the traffic flow increases, the engine temp drops again. This is a sign that the viscous coupler (fan clutch) is worn out. Without getting bogged down on specifics, the viscous material expands with heat and presses stuff together inside the coupler to lock the fan to the pulley and provide a positive drive. Another school of though says that the viscous material is forced through holes inside the coupling, and as the viscous material heats up it gets thicker and can not pass through the holes and therefore provides a positive drive force for the fan. No matter which theory you like, the viscous material is not doing its job, and you need a new fan clutch to resolve your problem. When you pull into the driveway and shut off the hot engine, and open the hood, you should find the fan to be difficult to turn by hand. A few hours later, the fan should be easy to turn. If it turns the same, then the clutch is bad and you need a new one. There is no link between the fan drive and the power steering. You are correct, sort of, that the fan is "fluid drive", but it is really not fluid as much as it is more like a jell. The jelly thickens or expands or both to lock a clutch that then drives the fan. Otherwise the fan spins because of the friction but is not physically "driven." <ncflnc@yahoo.com> wrote in message news:1192699324.591587.21110@k35g2000prh.googlegro ups.com... > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. > |
Re: fluid drive cooling fan
Me thinks you do not understand all that you know.
The fan is driven by the fan belt, and is mounted to the pulley affixed to the water pump. The fan is not directly attached to the pulley, it is physically mounted to a viscous couple, and the couple is attached to the pulley that is driven by the fan belt. The viscous couple is designed to firmly secure the fan to the pulley when the air flow througbh the radiator is decreased and the resulting air temp rises at the fan itself. As the vehicle speed increases, the air flow also increases and the temp drops and the fan is released to essentially spin freely. (It does not actually spin freely, but the difference is such that it makes no difference for this discussion.) What you are really noticing is that as you drive slowly in stop-n-go traffic, the temp climbs, and as the traffic flow increases, the engine temp drops again. This is a sign that the viscous coupler (fan clutch) is worn out. Without getting bogged down on specifics, the viscous material expands with heat and presses stuff together inside the coupler to lock the fan to the pulley and provide a positive drive. Another school of though says that the viscous material is forced through holes inside the coupling, and as the viscous material heats up it gets thicker and can not pass through the holes and therefore provides a positive drive force for the fan. No matter which theory you like, the viscous material is not doing its job, and you need a new fan clutch to resolve your problem. When you pull into the driveway and shut off the hot engine, and open the hood, you should find the fan to be difficult to turn by hand. A few hours later, the fan should be easy to turn. If it turns the same, then the clutch is bad and you need a new one. There is no link between the fan drive and the power steering. You are correct, sort of, that the fan is "fluid drive", but it is really not fluid as much as it is more like a jell. The jelly thickens or expands or both to lock a clutch that then drives the fan. Otherwise the fan spins because of the friction but is not physically "driven." <ncflnc@yahoo.com> wrote in message news:1192699324.591587.21110@k35g2000prh.googlegro ups.com... > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. > |
Re: fluid drive cooling fan
http://www.----------.com/temp/WJfan.pdf Good luck.
God Bless America, Bill O|||||||O mailto:-------------------- <ncflnc@yahoo.com> wrote in message news:1192699324.591587.21110@k35g2000prh.googlegro ups.com... > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. > |
Re: fluid drive cooling fan
http://www.----------.com/temp/WJfan.pdf Good luck.
God Bless America, Bill O|||||||O mailto:-------------------- <ncflnc@yahoo.com> wrote in message news:1192699324.591587.21110@k35g2000prh.googlegro ups.com... > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. > |
Re: fluid drive cooling fan
http://www.----------.com/temp/WJfan.pdf Good luck.
God Bless America, Bill O|||||||O mailto:-------------------- <ncflnc@yahoo.com> wrote in message news:1192699324.591587.21110@k35g2000prh.googlegro ups.com... > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. > |
Re: Re: fluid drive cooling fan
On Thu, 18 Oct 2007 18:29:22 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: >What you are really noticing is that as you drive slowly in stop-n-go >traffic, the temp climbs, and as the traffic flow increases, the engine temp >drops again. This is a sign that the viscous coupler (fan clutch) is worn >out. Unless they have there fluid leaks out from seal failure or the bearing in them goes bad and it woobles around, they do not "wear out" as there is not else to wear out in them. What does happen to them is that the bimetal coil on the front of them ages and when it does it raise the engagement temp and the clutch is considered worn out then by many. Actually the coil is adjustable and if it has aged to the point that it does not engage properly you can tweak it back into running order. I have been doing this for over 25 years now and I have only actualy replaced one clutch because of bearing/seal failure during this time and it was about 20 years old too. Below is a link on how to adjust them if you are interested. http://forum.snoman.com/viewtopic.php?t=79 ----------------- TheSnoMan.com |
Re: Re: fluid drive cooling fan
On Thu, 18 Oct 2007 18:29:22 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: >What you are really noticing is that as you drive slowly in stop-n-go >traffic, the temp climbs, and as the traffic flow increases, the engine temp >drops again. This is a sign that the viscous coupler (fan clutch) is worn >out. Unless they have there fluid leaks out from seal failure or the bearing in them goes bad and it woobles around, they do not "wear out" as there is not else to wear out in them. What does happen to them is that the bimetal coil on the front of them ages and when it does it raise the engagement temp and the clutch is considered worn out then by many. Actually the coil is adjustable and if it has aged to the point that it does not engage properly you can tweak it back into running order. I have been doing this for over 25 years now and I have only actualy replaced one clutch because of bearing/seal failure during this time and it was about 20 years old too. Below is a link on how to adjust them if you are interested. http://forum.snoman.com/viewtopic.php?t=79 ----------------- TheSnoMan.com |
Re: Re: fluid drive cooling fan
On Thu, 18 Oct 2007 18:29:22 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: >What you are really noticing is that as you drive slowly in stop-n-go >traffic, the temp climbs, and as the traffic flow increases, the engine temp >drops again. This is a sign that the viscous coupler (fan clutch) is worn >out. Unless they have there fluid leaks out from seal failure or the bearing in them goes bad and it woobles around, they do not "wear out" as there is not else to wear out in them. What does happen to them is that the bimetal coil on the front of them ages and when it does it raise the engagement temp and the clutch is considered worn out then by many. Actually the coil is adjustable and if it has aged to the point that it does not engage properly you can tweak it back into running order. I have been doing this for over 25 years now and I have only actualy replaced one clutch because of bearing/seal failure during this time and it was about 20 years old too. Below is a link on how to adjust them if you are interested. http://forum.snoman.com/viewtopic.php?t=79 ----------------- TheSnoMan.com |
Re: fluid drive cooling fan
On Oct 18, 5:22 am, ncf...@yahoo.com wrote:
> 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. This is an oil driven fan, on a PWM circuit, commanded by the PCM. If the engine is overheating, the first thing you should do/have done is a block check for combustion gases. I've done head gaskets on a couple of these for this concern. Good luck. |
Re: fluid drive cooling fan
On Oct 18, 5:22 am, ncf...@yahoo.com wrote:
> 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. This is an oil driven fan, on a PWM circuit, commanded by the PCM. If the engine is overheating, the first thing you should do/have done is a block check for combustion gases. I've done head gaskets on a couple of these for this concern. Good luck. |
Re: fluid drive cooling fan
On Oct 18, 5:22 am, ncf...@yahoo.com wrote:
> 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > stearing unit. The fan drive is activated by what and where is it > located??. > > Where or what sends the signal ??? located?? > > The fan runs and will cool ,, but only when the temp guage goes over > the half way mark . > > At this temp the jeep is starting to experenceing over heating > problems. This is an oil driven fan, on a PWM circuit, commanded by the PCM. If the engine is overheating, the first thing you should do/have done is a block check for combustion gases. I've done head gaskets on a couple of these for this concern. Good luck. |
Re: fluid drive cooling fan
On cars that didn't change their coolant, hopefully.
God Bless America, Bill O|||||||O mailto:-------------------- http://www.----------.com/ "juiceman" <juiceman5150@gmail.com> wrote in message news:1192756499.336687.296200@k35g2000prh.googlegr oups.com... > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > > If the engine is overheating, the first thing you should do/have done > is a block check for combustion gases. I've done head gaskets on a > couple of these for this concern. > > Good luck. > > |
Re: fluid drive cooling fan
On cars that didn't change their coolant, hopefully.
God Bless America, Bill O|||||||O mailto:-------------------- http://www.----------.com/ "juiceman" <juiceman5150@gmail.com> wrote in message news:1192756499.336687.296200@k35g2000prh.googlegr oups.com... > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > > If the engine is overheating, the first thing you should do/have done > is a block check for combustion gases. I've done head gaskets on a > couple of these for this concern. > > Good luck. > > |
Re: fluid drive cooling fan
On cars that didn't change their coolant, hopefully.
God Bless America, Bill O|||||||O mailto:-------------------- http://www.----------.com/ "juiceman" <juiceman5150@gmail.com> wrote in message news:1192756499.336687.296200@k35g2000prh.googlegr oups.com... > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > > If the engine is overheating, the first thing you should do/have done > is a block check for combustion gases. I've done head gaskets on a > couple of these for this concern. > > Good luck. > > |
Re: fluid drive cooling fan
"juiceman" <juiceman5150@gmail.com> wrote in message news:1192756499.336687.296200@k35g2000prh.googlegr oups.com... > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > Could you give us the Reader's Digest description of what you just said. I'm not familiar with an "oil driven fan," and the part about the PWM circuit has me scratching my head. |
Re: fluid drive cooling fan
"juiceman" <juiceman5150@gmail.com> wrote in message news:1192756499.336687.296200@k35g2000prh.googlegr oups.com... > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > Could you give us the Reader's Digest description of what you just said. I'm not familiar with an "oil driven fan," and the part about the PWM circuit has me scratching my head. |
Re: fluid drive cooling fan
"juiceman" <juiceman5150@gmail.com> wrote in message news:1192756499.336687.296200@k35g2000prh.googlegr oups.com... > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > Could you give us the Reader's Digest description of what you just said. I'm not familiar with an "oil driven fan," and the part about the PWM circuit has me scratching my head. |
Re: fluid drive cooling fan
On Thu, 18 Oct 2007 02:22:04 -0700, ncflnc@yahoo.com wrote:
>2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power >stearing unit. The fan drive is activated by what and where is it >located??. > >Where or what sends the signal ??? located?? > >The fan runs and will cool ,, but only when the temp guage goes over >the half way mark . > >At this temp the jeep is starting to experenceing over heating >problems. WJ's w/4.7 V8's and WK 5.7 and Diesel use a Radiator Mounted Hydraulic Powered Fan. The Power Steering Pump has two rotors and two circuits, one dedicated for the Fan and one for Power Steering. The Hydraulic Fan is driven by a Gerotor type motor and there is a solenoid on it which shifts displacement, effectively changing the speed from a low range to a high range. Even with this arrangement, Fan Speed is proportional to Engine Speed because of pump in the PS runs according to the accessory drive belt ratio. The Fan is controlled by the Engine Controller and responds to Coolant Temperature and AC Head Pressure to turn on or change ranges. My '01 4.7 WJ consistently ran coolant temperatures indicated at the halfway mark on the gauge. No problems ever, tremendous amounts of airflow from the fan. The biggest problem I had was groaning in the high pressure oil lines after the isolators got old and hard. Blockage of course (bugs, debris, cottonwood fuzz etc.) will reduce airflow a lot, even with a powerful fan leading to overheating. 4.7's also have an inlet side T'Stat and '00's and '01's had some problems with the coolant chamber mixing hot and cold and the correct function of the T'Stat. The 4.7 also has a coolant bleed screw on the top of the T'Stat housing because it is higher than the radiator fill neck and will trap air. Remember to bleed out the air after changing coolant or if you've let the CRS bottle run low and it aspirates air into the system. reboot --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000782-2, 10/18/2007 Tested on: 10/19/2007 12:28:54 AM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com |
Re: fluid drive cooling fan
On Thu, 18 Oct 2007 02:22:04 -0700, ncflnc@yahoo.com wrote:
>2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power >stearing unit. The fan drive is activated by what and where is it >located??. > >Where or what sends the signal ??? located?? > >The fan runs and will cool ,, but only when the temp guage goes over >the half way mark . > >At this temp the jeep is starting to experenceing over heating >problems. WJ's w/4.7 V8's and WK 5.7 and Diesel use a Radiator Mounted Hydraulic Powered Fan. The Power Steering Pump has two rotors and two circuits, one dedicated for the Fan and one for Power Steering. The Hydraulic Fan is driven by a Gerotor type motor and there is a solenoid on it which shifts displacement, effectively changing the speed from a low range to a high range. Even with this arrangement, Fan Speed is proportional to Engine Speed because of pump in the PS runs according to the accessory drive belt ratio. The Fan is controlled by the Engine Controller and responds to Coolant Temperature and AC Head Pressure to turn on or change ranges. My '01 4.7 WJ consistently ran coolant temperatures indicated at the halfway mark on the gauge. No problems ever, tremendous amounts of airflow from the fan. The biggest problem I had was groaning in the high pressure oil lines after the isolators got old and hard. Blockage of course (bugs, debris, cottonwood fuzz etc.) will reduce airflow a lot, even with a powerful fan leading to overheating. 4.7's also have an inlet side T'Stat and '00's and '01's had some problems with the coolant chamber mixing hot and cold and the correct function of the T'Stat. The 4.7 also has a coolant bleed screw on the top of the T'Stat housing because it is higher than the radiator fill neck and will trap air. Remember to bleed out the air after changing coolant or if you've let the CRS bottle run low and it aspirates air into the system. reboot --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000782-2, 10/18/2007 Tested on: 10/19/2007 12:28:54 AM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com |
Re: fluid drive cooling fan
On Thu, 18 Oct 2007 02:22:04 -0700, ncflnc@yahoo.com wrote:
>2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power >stearing unit. The fan drive is activated by what and where is it >located??. > >Where or what sends the signal ??? located?? > >The fan runs and will cool ,, but only when the temp guage goes over >the half way mark . > >At this temp the jeep is starting to experenceing over heating >problems. WJ's w/4.7 V8's and WK 5.7 and Diesel use a Radiator Mounted Hydraulic Powered Fan. The Power Steering Pump has two rotors and two circuits, one dedicated for the Fan and one for Power Steering. The Hydraulic Fan is driven by a Gerotor type motor and there is a solenoid on it which shifts displacement, effectively changing the speed from a low range to a high range. Even with this arrangement, Fan Speed is proportional to Engine Speed because of pump in the PS runs according to the accessory drive belt ratio. The Fan is controlled by the Engine Controller and responds to Coolant Temperature and AC Head Pressure to turn on or change ranges. My '01 4.7 WJ consistently ran coolant temperatures indicated at the halfway mark on the gauge. No problems ever, tremendous amounts of airflow from the fan. The biggest problem I had was groaning in the high pressure oil lines after the isolators got old and hard. Blockage of course (bugs, debris, cottonwood fuzz etc.) will reduce airflow a lot, even with a powerful fan leading to overheating. 4.7's also have an inlet side T'Stat and '00's and '01's had some problems with the coolant chamber mixing hot and cold and the correct function of the T'Stat. The 4.7 also has a coolant bleed screw on the top of the T'Stat housing because it is higher than the radiator fill neck and will trap air. Remember to bleed out the air after changing coolant or if you've let the CRS bottle run low and it aspirates air into the system. reboot --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000782-2, 10/18/2007 Tested on: 10/19/2007 12:28:54 AM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com |
Re: fluid drive cooling fan
On Fri, 19 Oct 2007 01:51:34 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: > >"juiceman" <juiceman5150@gmail.com> wrote in message >news:1192756499.336687.296200@k35g2000prh.googleg roups.com... >> >> This is an oil driven fan, on a PWM circuit, commanded by the PCM. >> > >Could you give us the Reader's Digest description of what you just said. > >I'm not familiar with an "oil driven fan," and the part about the PWM >circuit has me scratching my head. > > pulse width modulated 'Tis a way of controling speed using essentially a square wave signal with varying on-times. -- Old Crow "Yol Bolson!" '82 FLTC-P "Miss Pearl" '95 YJ Rio Grande BS#133, SENS, TOMKAT, MAMBM -- Posted via a free Usenet account from http://www.teranews.com |
Re: fluid drive cooling fan
On Fri, 19 Oct 2007 01:51:34 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: > >"juiceman" <juiceman5150@gmail.com> wrote in message >news:1192756499.336687.296200@k35g2000prh.googleg roups.com... >> >> This is an oil driven fan, on a PWM circuit, commanded by the PCM. >> > >Could you give us the Reader's Digest description of what you just said. > >I'm not familiar with an "oil driven fan," and the part about the PWM >circuit has me scratching my head. > > pulse width modulated 'Tis a way of controling speed using essentially a square wave signal with varying on-times. -- Old Crow "Yol Bolson!" '82 FLTC-P "Miss Pearl" '95 YJ Rio Grande BS#133, SENS, TOMKAT, MAMBM -- Posted via a free Usenet account from http://www.teranews.com |
Re: fluid drive cooling fan
On Fri, 19 Oct 2007 01:51:34 GMT, "Jeff Strickland"
<crwlr@verizon.net> wrote: > >"juiceman" <juiceman5150@gmail.com> wrote in message >news:1192756499.336687.296200@k35g2000prh.googleg roups.com... >> >> This is an oil driven fan, on a PWM circuit, commanded by the PCM. >> > >Could you give us the Reader's Digest description of what you just said. > >I'm not familiar with an "oil driven fan," and the part about the PWM >circuit has me scratching my head. > > pulse width modulated 'Tis a way of controling speed using essentially a square wave signal with varying on-times. -- Old Crow "Yol Bolson!" '82 FLTC-P "Miss Pearl" '95 YJ Rio Grande BS#133, SENS, TOMKAT, MAMBM -- Posted via a free Usenet account from http://www.teranews.com |
Re: fluid drive cooling fan
how about checking cooling system level first then fault codes but thats too
simple ay! juiceman wrote: > On Oct 18, 5:22 am, ncf...@yahoo.com wrote: > > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > > stearing unit. The fan drive is activated by what and where is it > > located??. > > > > Where or what sends the signal ??? located?? > > > > The fan runs and will cool ,, but only when the temp guage goes over > > the half way mark . > > > > At this temp the jeep is starting to experenceing over heating > > problems. > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > > If the engine is overheating, the first thing you should do/have done > is a block check for combustion gases. I've done head gaskets on a > couple of these for this concern. > > Good luck. |
Re: fluid drive cooling fan
how about checking cooling system level first then fault codes but thats too
simple ay! juiceman wrote: > On Oct 18, 5:22 am, ncf...@yahoo.com wrote: > > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > > stearing unit. The fan drive is activated by what and where is it > > located??. > > > > Where or what sends the signal ??? located?? > > > > The fan runs and will cool ,, but only when the temp guage goes over > > the half way mark . > > > > At this temp the jeep is starting to experenceing over heating > > problems. > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > > If the engine is overheating, the first thing you should do/have done > is a block check for combustion gases. I've done head gaskets on a > couple of these for this concern. > > Good luck. |
Re: fluid drive cooling fan
how about checking cooling system level first then fault codes but thats too
simple ay! juiceman wrote: > On Oct 18, 5:22 am, ncf...@yahoo.com wrote: > > 2001 GC Jeep 4.7,,,,cooling fan motor is fluid drive ,, from the power > > stearing unit. The fan drive is activated by what and where is it > > located??. > > > > Where or what sends the signal ??? located?? > > > > The fan runs and will cool ,, but only when the temp guage goes over > > the half way mark . > > > > At this temp the jeep is starting to experenceing over heating > > problems. > > This is an oil driven fan, on a PWM circuit, commanded by the PCM. > > If the engine is overheating, the first thing you should do/have done > is a block check for combustion gases. I've done head gaskets on a > couple of these for this concern. > > Good luck. |
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