Mike Romain wrote:
> jojo wrote:
>> On a trip this week I noticed that when I stopped the jeep got hot. I
>> turned the fan to 2nd position and all was well. Observation is that
>> while driving there is enough airflow to enable the AC to keep things
>> cool. When stopped, the fan must be turned up. Is it more likely that
>> the fan switch has failed on lowest setting or more likely that the fan
>> is faulty? Any input? (Yeah, I know, take the doors off, but it's 100+
>> here).
>>
>>
>
> OK....................
>
> First off, "Take the doors off" on an XJ? Inquiring minds just gotta
> ask, How?
>
> You are describing a failure of the viscus fan clutch on the radiator
> fan or a failed electric booster fan on the XJ long rad.
>
> Both are easy to check. First on a hot engine, have someone shut it
> down while watching the main fan to see if it stops almost instantly.
> If it freewheels on a hot engine, the clutch is toast.
>
> Then turn on the AC on a hot running engine and the auxiliary fan should
> turn on.
Taking the doors of an XJ is actually pretty simple - 6 bolts per door. Of
course, you have to figure out a way to keep the now empty hinges out of
the way.....
I think he's talking about the insdie temperature - he's getting hot, not
the Jeep. Two potential issues. First, you may be low on refrgerant.
Second, and related, is that at a stop (idle) the compressor is limited in
how much gas it can supply for cooling. If you can bump the RPM from idle
to 1100 - 1200 RPM and feel a difference in the outlet temp that may be
the
root cause. A broken or poorly working fan (electric or engine driven)
just compounds things by not cooling the high pressure/temp of the system.
Some systems barely work at parked idle - that's the nature of the beast.
--
Will Honea
whonea@[EMAIL PROTECTED]
Posted from http://www.teranews.com
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