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I own a 2001 Montero, and recently the temperature gauge started acting up. I immediately replaced the thermostat, which wasn't the problem. I took it in to the shop, and they replaced the temperature sensor. Five minutes after leaving the shop, the temp gauge pegged to Hot again, and then immediately back down. The shop tells me that temps are normal when hooked to the scanner, even when it's pegged on hot. They kept it for a day to run some tests, but are dumfounded. They don't know what the problem is, or how to rectify it. Please help.

Thanks,
Matt
 

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if the engine is indeed NOT overheating, your issue is probably a failing instrument cluster ECM. Ive dealt with that issue a few times in the past.

first thing to do is 100 percent verify that the car is not overheating.

it is NOT normal for the gauge to move when a scan tool is plugged in.
 

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<div class='quotetop'>QUOTE (jamess @ Oct 20 2008, 01:54 PM) <{POST_SNAPBACK}></div>
I have a 2001 Pajero 3.2 D with the same problem - did you solve yours?[/b]
Had the exact problem on my 2001 Pajero 3.2 did GLX that you have. First I replaced the thermostat, Then the temp. sender unit, but the problem remained. Then I cheked the waterpump, borrowed another radiator. Finally took the instrument cluster and replaced it with another from 2003 Pajero 3.2 did, and finally the problem is solved. I assume that the problem is in the temerature gauge.

Check this out, http://www2.pajeroclub.com.au/forum/showthread.php?t=3014
 
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