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