On Tue, 2 Oct 2007 20:00:29 -0400, "doane_nut" <nospam@nospam.com>
wrote:

>The relays often fail, and seems to me when ours failed with the fan on we
>also needed a new fan as the motor was drawing more current then it should.
>Bearings probably going out. Our '99 has been in the shop at least 3 times
>for this issue. It is not the sensor, but usually the relay, which they get
>plenty of lab or for changing as it is behind the headlight and I believe
>the bumper fascia needs to be removed. Does not sound like a "rip-off", just
>a common expensive Jeep malady.


It seems to me that if the relay sticks that easily then it is under
rated for the job and fails with time. Relays can arc a lot under high
current and DC loads and if the contacts are not sized properly for
this load they will fail with time. If this is really such a common
problem, they should have fixed it with a higher capacity relay rather
that keep sticking you with replacing a marginally rated one. I have
had a lot of cars over the years with electric fans and never had the
first one with control relay issues even after 11 years of service.
Properly sized the fuse will blow before the relay would burn and they
fact that no one mentions fuses blowing tends to support a design flaw
with a improperly sized/rated relay. (likley to save a few pennies
when building them)
-----------------
TheSnoMan.com

 

the realy can be replaced in less than a hour when atech of experance is used and
the front cover does not have to come off can you say ripped

"P.Schuman" wrote:

> today when I went to the store,
> I noticed that the electric colling fan was running
> after I turned off the Jeep Grand Cherokee 2001 -
> ok... maybe it needed to run.
> but it was still running when I came back.
> So, I drove to the dealer... $$
> They had to replace the fan (said it was shorted) + relay (said overheated) .
>
> I would think that the sensor was the only culprit ?
> Where and how is the fan regulated, on/off, and the relay ?
> If the fan was "running" just fine, why did it need replacing ?
>
> relay package - 5017491-AB $86
> cooling fan - CBG4F250 $60
>
> Anyway - the ONLY way to get at all these parts
> was from the FRONT grill/bumper and that took a couple hours total...
> SO - for a $60-$80 fan - it cost almost $400 in labor !!

 

the realy can be replaced in less than a hour when atech of experance is used and
the front cover does not have to come off can you say ripped

"P.Schuman" wrote:

> today when I went to the store,
> I noticed that the electric colling fan was running
> after I turned off the Jeep Grand Cherokee 2001 -
> ok... maybe it needed to run.
> but it was still running when I came back.
> So, I drove to the dealer... $$
> They had to replace the fan (said it was shorted) + relay (said overheated) .
>
> I would think that the sensor was the only culprit ?
> Where and how is the fan regulated, on/off, and the relay ?
> If the fan was "running" just fine, why did it need replacing ?
>
> relay package - 5017491-AB $86
> cooling fan - CBG4F250 $60
>
> Anyway - the ONLY way to get at all these parts
> was from the FRONT grill/bumper and that took a couple hours total...
> SO - for a $60-$80 fan - it cost almost $400 in labor !!

 

the realy can be replaced in less than a hour when atech of experance is used and
the front cover does not have to come off can you say ripped

"P.Schuman" wrote:

> today when I went to the store,
> I noticed that the electric colling fan was running
> after I turned off the Jeep Grand Cherokee 2001 -
> ok... maybe it needed to run.
> but it was still running when I came back.
> So, I drove to the dealer... $$
> They had to replace the fan (said it was shorted) + relay (said overheated) .
>
> I would think that the sensor was the only culprit ?
> Where and how is the fan regulated, on/off, and the relay ?
> If the fan was "running" just fine, why did it need replacing ?
>
> relay package - 5017491-AB $86
> cooling fan - CBG4F250 $60
>
> Anyway - the ONLY way to get at all these parts
> was from the FRONT grill/bumper and that took a couple hours total...
> SO - for a $60-$80 fan - it cost almost $400 in labor !!

 

the realy can be replaced in less than a hour when atech of experance is used and
the front cover does not have to come off can you say ripped

"P.Schuman" wrote:

> today when I went to the store,
> I noticed that the electric colling fan was running
> after I turned off the Jeep Grand Cherokee 2001 -
> ok... maybe it needed to run.
> but it was still running when I came back.
> So, I drove to the dealer... $$
> They had to replace the fan (said it was shorted) + relay (said overheated) .
>
> I would think that the sensor was the only culprit ?
> Where and how is the fan regulated, on/off, and the relay ?
> If the fan was "running" just fine, why did it need replacing ?
>
> relay package - 5017491-AB $86
> cooling fan - CBG4F250 $60
>
> Anyway - the ONLY way to get at all these parts
> was from the FRONT grill/bumper and that took a couple hours total...
> SO - for a $60-$80 fan - it cost almost $400 in labor !!