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Unread 03-31-2013, 10:28 AM   #16
AZ Jeff
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2000 XJ Cherokee 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,305
Quote:
Originally Posted by Motorcharge View Post
I've since replaced the radiator and aux fan. Backflushed the system prior to installing the new radiator and backflushed the heater core again on it's own. New rad is in, aux fan works. Same situation. Put an IR gun on it today, it's definitely not running hot or anywhere close to what the gauge is reading.
So now you have confirmed you have a guage problem. As others suggested, the cheaper of the two major elements of the temperature guage system is the sender. Get a new one, and preferably from Mopar, as it's most likely to be properly calibrated to work with a known good guage correctly.

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Unread 03-31-2013, 11:21 AM   #17
Paradise XJ
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1990 XJ Cherokee 
 
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Location: Paradise, CA, Northern California
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When you replaced the sender...did you put any thread sealer, teflon tape or RTV on the threads? Since the one wire sender grounds at the head, putting goop on the threads can give you an errant/unreliable reading.

I would personally stay away from installing a sender in the t-stat housing. Just my opinion that it's just a hack job. Fix it right IMHO.
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Unread 03-31-2013, 12:36 PM   #18
Motorcharge
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The one I've replaced is the one in the back of the cylinder head. I didnt put anything on it prior to putting it in.
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Unread 03-31-2013, 09:52 PM   #19
AZ Jeff
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2000 XJ Cherokee 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
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Quote:
Originally Posted by Motorcharge View Post
The one I've replaced is the one in the back of the cylinder head. I didnt put anything on it prior to putting it in.
That's correct. It's NPT, so it's self-sealing if the threads are clean.
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1992 XJ -- stock (RIP)
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