Tom R

I switched the relay for the electric fan (40) with the ignition relay (also
40).


"bllsht" <nospam@invaliddot.net> wrote in message
news:29q5b09l80o8uit5gr9et3hr5fudnofp92@4ax.com...
> In message <Gctsc.24027$fF3.612160@bgtnsc05-news.ops.worldnet.att.net>,
"Tom R"
> wrote:
>
> >I already tested the fan & relay, they both are OK. I switched out the
> >Coolant Temperature Sensor today and still no luck.
>
> The fan staying on before total failure sure sounds like a relay problem
to me.
> How did you test it?
>
> If the old fan motor was so worn that it was running slow, it probably
smoked
> the relay.
>
> >
> >Now I am wondering now if it could be the thermostat. I know the CTS is
in
> >the same housing as the thermostat, but is it upstream of the thermostat?
> >
> >Tom R.
> >
> >"Snow" <snowball_2004@msn.com> wrote in message
> >news:848sc.9996$sr3.117197@news20.bellglobal.com. ..
> >> Well assuming its the same layout as my 4.0 , the electric fan gets
its
> >> signal from the temp sensor on the thermostat housing, the gauge gets
its
> >> signal from a sending unit on the after left hand side of the engine.
the
> >> gauge and fan don't share the sensor/sending units. Sounds to me
like
> >> either your temp sensor (on the t-stat housing) or the relay for it has
> >bit
> >> the dust. Eliminate the fan by connecting it directly to the battery,
if
> >it
> >> spins then you know its good.
> >>
> >> Snow... "Don Cherry for Prime Minister"
> >>
> >>
> >> "Tom R" <tomr@noreply.com> wrote in message
> >> news:ec6sc.19789$fF3.505534@bgtnsc05-news.ops.worldnet.att.net...
> >> > 1999 Grand Cherokee w/ 4.0L. The electric cooling fan was going
through
> >a
> >> > slow death (decreasing RPM's) so I recently replaced.
> >> >
> >> > The new fan worked fine for several days then it ran constantly after
> >the
> >> > engine was shut off. For several days I just unplugged the fan so it
> >would
> >> > not drain my battery. Now when I plug it back in, it does not work at
> >all,
> >> > even when the temperature guage reads 210+.
> >> >
> >> > The temperature guage, thermostat and relay appear to working
correctly.
> >> >
> >> > Does the electric fan take its signal from the temperature sensor at
the
> >> > thermostat or is there another sensor that could be causing the
problem?
> >> >
> >> > Any suggestions?
> >> >
> >> > - Tom R
> >> >
> >> >
> >> >
> >>
> >>
> >
> >
>

Tom R

I have not been able to locate the electric fan fuse. I cannot find a fuse
labeled for the electric fan either in the relay box next to the battery or
in the junction box under the dashboard on the driver's side. Is there
another location or does the fan relay share a fuse with something else.
BTW, I have a 99 Grand Cherokee.

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40B119D0.421F2E5C@***.net...
> http://www.----------.com/coolingFan.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Tom R wrote:
> >
> > 1999 Grand Cherokee w/ 4.0L. The electric cooling fan was going through
a
> > slow death (decreasing RPM's) so I recently replaced.
> >
> > The new fan worked fine for several days then it ran constantly after
the
> > engine was shut off. For several days I just unplugged the fan so it
would
> > not drain my battery. Now when I plug it back in, it does not work at
all,
> > even when the temperature guage reads 210+.
> >
> > The temperature guage, thermostat and relay appear to working correctly.
> >
> > Does the electric fan take its signal from the temperature sensor at the
> > thermostat or is there another sensor that could be causing the problem?
> >
> > Any suggestions?
> >
> > - Tom R

Tom R

I have not been able to locate the electric fan fuse. I cannot find a fuse
labeled for the electric fan either in the relay box next to the battery or
in the junction box under the dashboard on the driver's side. Is there
another location or does the fan relay share a fuse with something else.
BTW, I have a 99 Grand Cherokee.

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40B119D0.421F2E5C@***.net...
> http://www.----------.com/coolingFan.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Tom R wrote:
> >
> > 1999 Grand Cherokee w/ 4.0L. The electric cooling fan was going through
a
> > slow death (decreasing RPM's) so I recently replaced.
> >
> > The new fan worked fine for several days then it ran constantly after
the
> > engine was shut off. For several days I just unplugged the fan so it
would
> > not drain my battery. Now when I plug it back in, it does not work at
all,
> > even when the temperature guage reads 210+.
> >
> > The temperature guage, thermostat and relay appear to working correctly.
> >
> > Does the electric fan take its signal from the temperature sensor at the
> > thermostat or is there another sensor that could be causing the problem?
> >
> > Any suggestions?
> >
> > - Tom R

Tom R

I have not been able to locate the electric fan fuse. I cannot find a fuse
labeled for the electric fan either in the relay box next to the battery or
in the junction box under the dashboard on the driver's side. Is there
another location or does the fan relay share a fuse with something else.
BTW, I have a 99 Grand Cherokee.

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40B119D0.421F2E5C@***.net...
> http://www.----------.com/coolingFan.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Tom R wrote:
> >
> > 1999 Grand Cherokee w/ 4.0L. The electric cooling fan was going through
a
> > slow death (decreasing RPM's) so I recently replaced.
> >
> > The new fan worked fine for several days then it ran constantly after
the
> > engine was shut off. For several days I just unplugged the fan so it
would
> > not drain my battery. Now when I plug it back in, it does not work at
all,
> > even when the temperature guage reads 210+.
> >
> > The temperature guage, thermostat and relay appear to working correctly.
> >
> > Does the electric fan take its signal from the temperature sensor at the
> > thermostat or is there another sensor that could be causing the problem?
> >
> > Any suggestions?
> >
> > - Tom R

Tom R

I have not been able to locate the electric fan fuse. I cannot find a fuse
labeled for the electric fan either in the relay box next to the battery or
in the junction box under the dashboard on the driver's side. Is there
another location or does the fan relay share a fuse with something else.
BTW, I have a 99 Grand Cherokee.

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40B119D0.421F2E5C@***.net...
> http://www.----------.com/coolingFan.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Tom R wrote:
> >
> > 1999 Grand Cherokee w/ 4.0L. The electric cooling fan was going through
a
> > slow death (decreasing RPM's) so I recently replaced.
> >
> > The new fan worked fine for several days then it ran constantly after
the
> > engine was shut off. For several days I just unplugged the fan so it
would
> > not drain my battery. Now when I plug it back in, it does not work at
all,
> > even when the temperature guage reads 210+.
> >
> > The temperature guage, thermostat and relay appear to working correctly.
> >
> > Does the electric fan take its signal from the temperature sensor at the
> > thermostat or is there another sensor that could be causing the problem?
> >
> > Any suggestions?
> >
> > - Tom R

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I just put up the XJ because the trouble shooting should be the
same. My newer WJ manual only shows a hydraulically driven fan motor:
http://www.----------.com/WJcoolFan.jpg
God Bless America, ßill O|||||||O
mailto:--------------------
Tom R wrote:
>
> I have not been able to locate the electric fan fuse. I cannot find a fuse
> labeled for the electric fan either in the relay box next to the battery or
> in the junction box under the dashboard on the driver's side. Is there
> another location or does the fan relay share a fuse with something else.
> BTW, I have a 99 Grand Cherokee.

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I just put up the XJ because the trouble shooting should be the
same. My newer WJ manual only shows a hydraulically driven fan motor:
http://www.----------.com/WJcoolFan.jpg
God Bless America, ßill O|||||||O
mailto:--------------------
Tom R wrote:
>
> I have not been able to locate the electric fan fuse. I cannot find a fuse
> labeled for the electric fan either in the relay box next to the battery or
> in the junction box under the dashboard on the driver's side. Is there
> another location or does the fan relay share a fuse with something else.
> BTW, I have a 99 Grand Cherokee.

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I just put up the XJ because the trouble shooting should be the
same. My newer WJ manual only shows a hydraulically driven fan motor:
http://www.----------.com/WJcoolFan.jpg
God Bless America, ßill O|||||||O
mailto:--------------------
Tom R wrote:
>
> I have not been able to locate the electric fan fuse. I cannot find a fuse
> labeled for the electric fan either in the relay box next to the battery or
> in the junction box under the dashboard on the driver's side. Is there
> another location or does the fan relay share a fuse with something else.
> BTW, I have a 99 Grand Cherokee.

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I just put up the XJ because the trouble shooting should be the
same. My newer WJ manual only shows a hydraulically driven fan motor:
http://www.----------.com/WJcoolFan.jpg
God Bless America, ßill O|||||||O
mailto:--------------------
Tom R wrote:
>
> I have not been able to locate the electric fan fuse. I cannot find a fuse
> labeled for the electric fan either in the relay box next to the battery or
> in the junction box under the dashboard on the driver's side. Is there
> another location or does the fan relay share a fuse with something else.
> BTW, I have a 99 Grand Cherokee.

bllsht

40? I'm thinking you're talking about the 40 amp maxi fuses in the power
distribution center. If not, what is this 40 you refer to?



In message <B8Hsc.26419$fF3.679331@bgtnsc05-news.ops.worldnet.att.net>, "Tom R"
wrote:

>I switched the relay for the electric fan (40) with the ignition relay (also
>40).
>
>
>"bllsht" <nospam@invaliddot.net> wrote in message
>news:29q5b09l80o8uit5gr9et3hr5fudnofp92@4ax.com.. .
>> In message <Gctsc.24027$fF3.612160@bgtnsc05-news.ops.worldnet.att.net>,
>"Tom R"
>> wrote:
>>
>> >I already tested the fan & relay, they both are OK. I switched out the
>> >Coolant Temperature Sensor today and still no luck.
>>
>> The fan staying on before total failure sure sounds like a relay problem
>to me.
>> How did you test it?
>>
>> If the old fan motor was so worn that it was running slow, it probably
>smoked
>> the relay.
>>
>> >
>> >Now I am wondering now if it could be the thermostat. I know the CTS is
>in
>> >the same housing as the thermostat, but is it upstream of the thermostat?
>> >
>> >Tom R.
>> >
>> >"Snow" <snowball_2004@msn.com> wrote in message
>> >news:848sc.9996$sr3.117197@news20.bellglobal.com. ..
>> >> Well assuming its the same layout as my 4.0 , the electric fan gets
>its
>> >> signal from the temp sensor on the thermostat housing, the gauge gets
>its
>> >> signal from a sending unit on the after left hand side of the engine.
>the
>> >> gauge and fan don't share the sensor/sending units. Sounds to me
>like
>> >> either your temp sensor (on the t-stat housing) or the relay for it has
>> >bit
>> >> the dust. Eliminate the fan by connecting it directly to the battery,
>if
>> >it
>> >> spins then you know its good.
>> >>
>> >> Snow... "Don Cherry for Prime Minister"
>> >>
>> >>
>> >> "Tom R" <tomr@noreply.com> wrote in message
>> >> news:ec6sc.19789$fF3.505534@bgtnsc05-news.ops.worldnet.att.net...
>> >> > 1999 Grand Cherokee w/ 4.0L. The electric cooling fan was going
>through
>> >a
>> >> > slow death (decreasing RPM's) so I recently replaced.
>> >> >
>> >> > The new fan worked fine for several days then it ran constantly after
>> >the
>> >> > engine was shut off. For several days I just unplugged the fan so it
>> >would
>> >> > not drain my battery. Now when I plug it back in, it does not work at
>> >all,
>> >> > even when the temperature guage reads 210+.
>> >> >
>> >> > The temperature guage, thermostat and relay appear to working
>correctly.
>> >> >
>> >> > Does the electric fan take its signal from the temperature sensor at
>the
>> >> > thermostat or is there another sensor that could be causing the
>problem?
>> >> >
>> >> > Any suggestions?
>> >> >
>> >> > - Tom R
>> >> >
>> >> >
>> >> >
>> >>
>> >>
>> >
>> >
>>
>