Question about 2002 Mitsubishi Montero

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Temperature Gauge Is Pegging at HOT

I have a 2002 Mitsubishi Montero XLS. The other day the temperature gauge went from normal temp to Max HOT. The radiator is still cool enough to touch, it is not boiling over, and there is still coolant in the resivour. The gauge would go back down to normal in a few minutes, but now it immediately climbs to Max Hot within 1-2 minutes of turning the car on.

Any help would help since there are no repair manuals available on this year as of yet.

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  • ellswrt Jul 23, 2008

    This gets better and better! I replaced the CPU board and it fixed the temp gauge problem, but now I have no speedometer or odometer. Evidentally, if you replace the CPU, you have to send the new CPU AND the Instrument Cluster back to the factory to be reset with your current mileage and your gauges reset. This is another $300+ process or so I'm being told.



    Anyone out there that has had this problem before, and if so, is there an alternate fix??

  • cornelmitite Aug 19, 2008



    I have a 2002 Mitsubishi Montero Limited.
    The other day the temperature gauge went from normal temp to Max HOT.
    The radiator is still cool enough to touch, it is not boiling over, and
    there is still coolant in the resivour. The gauge would go back down to
    normal in a few minutes, but now it immediately climbs to Max Hot
    within 1-2 minutes of turning the car on.

  • donwithuop Aug 24, 2008

    I have a 2001 Montero with the same problem. I replaced the fan clutch and the temperate sensor. I am about to replace the water pump, but I doubt that fixes the problem. My vehicle does not seem to be atually getting hot, but the temp gauge jumps to "H" within seconds of starting sometimes. It does go back down to normal and usually jumps when I am at a stop light. How much is a CPU?

  • Anonymous Aug 24, 2008

    radiator fans is not working

  • c2camfan Sep 06, 2008

    Same problem on 2002 Montero XLS. Since manuals are impossible to acquire, I subscribed to ALLDATAdiy.com (not as good as a Haynes or Chilton's, but better than nothing). From there I was able to get the resistance tolerances for the gauge sending unit and computer temperature sending unit.

    The temp gauge sender should have a resistance of 73 ohm at 176 degrees. Since the thermostat is 180, I figured once the engine warmed up, it would be close to that value. The resistance started out at ~700 ohms and gradually dropped to 50 ohms and was still dropping. But it had no wild fluctuations, so assumed it was ok. The computer temp sending unit has a resistance of .26k ohms to .38k ohms. It was rock solid at .24k.

    Initially I had replaced the thermostat prior to finding this thread regarding the CPU board problem. Now after checking the resistance, I still wasn't confident that the gauge sending unit was ok (dropping down to less than 50 and still dropping - who knew how the firmware was programmed to translate that data?). Therefore, I went to Carquest and got a new gauge sending unit. Put it in and as you can expect, the problem is still occurring. However, the resistance value of the new one is a rock solid 59.4 ohms. So I question the reliability of the other unit, even though it didn't fix the problem.

    AllDATAdiy also mentions a multi-function thermal sensor/switch. Unfortunately, the site does not show where this sensor is located, so I cannot even test.

    At this point, I do not feel like taking it in to the dealership and spending money to have my dashboard sent to Michigan (bad design in my opinion that they can't reset/recalibrate at dealership), so I'm going to just buy a separate temperature gauge to mount under the dash. At least I will have peace of mind on the actual temperature. Although I have a feeling at some point in the future I will be replacing the circuit board in question since other gauges in the cluster will probably begin flaking out as well.




  • Anonymous Mar 24, 2014

    enternal temp gauge max out but engine does not get hot?

  • William Bruton
    William Bruton Jul 04, 2014

    I just got my Montero back today after having it sit at the dealership for a week. I too had to have it sent to Michigan for re-calibration/reprogramming. The cost was $100.00. The dealership charged me $95.00 to uninstall and reinstall the computer. The part (MR532787) costs $225.27. The only thing now is that the miles to empy gauge where the compass and clock is read 367 miles to empty. I had 1/3 tank of gas in the tank. I filled up and the number didn't change. I;mtrying to find a way to reset the gause. Maybe I'll take the battery cable off tomorrow and re-connect after maybe 30 minutes to see if it rectifies it

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Same problem on 2002 Montero XLS. Since manuals are impossible to acquire, I subscribed to ALLDATAdiy.com (not as good as a Haynes or Chilton's, but better than nothing). From there I was able to get the resistance tolerances for the gauge sending unit and computer temperature sending unit.

The temp gauge sender should have a resistance of 73 ohm at 176 degrees. Since the thermostat is 180, I figured once the engine warmed up, it would be close to that value. The resistance started out at ~700 ohms and gradually dropped to 50 ohms and was still dropping. But it had no wild fluctuations, so assumed it was ok. The computer temp sending unit has a resistance of .26k ohms to .38k ohms. It was rock solid at .24k.

Initially I had replaced the thermostat prior to finding this thread regarding the CPU board problem. Now after checking the resistance, I still wasn't confident that the gauge sending unit was ok (dropping down to less than 50 and still dropping - who knew how the firmware was programmed to translate that data?). Therefore, I went to Carquest and got a new gauge sending unit. Put it in and as you can expect, the problem is still occurring. However, the resistance value of the new one is a rock solid 59.4 ohms. So I question the reliability of the other unit, even though it didn't fix the problem.

AllDATAdiy also mentions a multi-function thermal sensor/switch. Unfortunately, the site does not show where this sensor is located, so I cannot even test.

At this point, I do not feel like taking it in to the dealership and spending money to have my dashboard sent to Michigan (bad design in my opinion that they can't reset/recalibrate at dealership), so I'm going to just buy a separate temperature gauge to mount under the dash. At least I will have peace of mind on the actual temperature. Although I have a feeling at some point in the future I will be replacing the circuit board in question since other gauges in the cluster will probably begin flaking out as well.

Posted on Sep 06, 2008

  • dauzatb Sep 07, 2011

    I just had the exact same problem. Thought it was the thermostat, replaced with seal & blew the air out. Still showed over heating, called Mitsubishi service said they have had to replace the CPU gauge boards on many Montero's and they require programming before installation nice so I ordered a new one and had it programmed & I am required to send the old CPU back for a core charge. Total cost for this repair $867.94 computers are expensive

  • William Bruton
    William Bruton Jul 04, 2014

    I just got my Montero back today after having it sit at the dealership for a week. I too had to have it sent to Michigan for re-calibration/reprogramming. The cost was $100.00. The dealership charged me $95.00 to uninstall and reinstall the computer. The part (MR532787) costs $225.27. The only thing now is that the miles to empy gauge where the compass and clock is read 367 miles to empty. I had 1/3 tank of gas in the tank. I filled up and the number didn't change. I;mtrying to find a way to reset the gause. Maybe I'll take the battery cable off tomorrow and re-connect after maybe 30 minutes to see if it rectifies it

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I fixed mine simple, look on youtube. There is a small resistor that is dry soldered. its on the back of the instrument cluster simple touch with a soldering iron and works like a dream.
Dont pay all the money just find the video and hey preto your done. Took me 20mins. Nick

Posted on Sep 24, 2015

My friend got the same problem in his SUV.but when i fix that,i don't really think that i furtunately found the problem.you don't need to worry to spend a lot of money just to fix that very small problem that can coz you a lot of head ache. just do this way. 1) open the circuit board and check if there's electrecal line discolored.(if does,you need to check it carefully if the is line was cut or still intact). 2) just retight the screwbolt connected to the temperature indicator. or clean the screwbolt befor you tighten it. 3) if it is doesn't work,replace the two or three resistor connected in the indicator .(it doesn't cost you a $1.)
that's all what i did,then everything runs ok.it looks like unbelievable isn't it? but try it,there's nothing to lost you.i did this not only once.
pls.send me an email if this remedy works on your car.(mydrum15@yahoo.com)

Posted on Oct 07, 2008

Same problem, I've been told by the dealer it isn't running hot, but it has a faulty circuit board...can be replaced for $300 w/ labor...I am still trying to find the part online and some info on how to replace it once I have it....so any info on that would be great

Posted on Jul 17, 2008

  • davebowen366 May 02, 2011

    Hello there to all that is having the problem with the montero very common on these enough to know about them worked at a mits dealer for over 8 years and can tell you its the cpu behind the gauge cluster most mits dealers if they are doing their job right will have that part in stock but they do need to send the gauge cluster out for the new burn in cluster of mileage, but to save you the labor if you pull the gauge cluster itself go buy the part then you can have them send it out for you that alone will save you about 100.00-150.00 depending on what they charge

  • William Bruton
    William Bruton Jul 04, 2014

    I just got my Montero back today after having it sit at the dealership for a week. I too had to have it sent to Michigan for re-calibration/reprogramming. The cost was $100.00. The dealership charged me $95.00 to uninstall and reinstall the computer. The part (MR532787) costs $225.27. The only thing now is that the miles to empy gauge where the compass and clock is read 367 miles to empty. I had 1/3 tank of gas in the tank. I filled up and the number didn't change. I;mtrying to find a way to reset the gause. Maybe I'll take the battery cable off tomorrow and re-connect after maybe 30 minutes to see if it rectifies it.

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Did the negative battery terminal removal able to reset the instrument CPU?

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I have a 2002 Mitsubishi Montero Limited. The other day the temperature gauge went from normal temp to Max HOT. The radiator is still cool enough to touch, it is not boiling over, and there is still coolant in the resivour. The gauge would go back down to normal in a few minutes, but now it immediately climbs to Max Hot within 1-2 minutes of turning the car on.

Jul 22, 2008 | 2002 Mitsubishi Montero

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Still Pegged at Max Hot even with new Tstat


Glad to hear the water pump is working!

Have you checked the seal of the radiator cap?

Another possibilty I forgot to mention is the fan clutch. This is what engages and disengages the fan. If it is working you should hear a 'click' sound as it engages and disengages.

c39c3b5.jpg

Jul 05, 2008 | 2002 Mitsubishi Montero

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Still Pegged at Max Hot even with new Tstat


Good Day again,

Sorry to hear it wasn't the thermostat, Other possible causes inlcudes low coolant, water pump and or waterpump belt, radiator blockage, and radiator cap not maintaining pressure. Check you coolant level first, fill if it's low, typically if it was the pump you would devolop a coolant leak as the pressure builds in the pump assembly. Check the belt though, any squeaks while running? Also if the seal in the raditor cap is bad then no pressure can build. To test the pump remove the raditaor cap (ensure the motor is COLD!!) and start the motor w/o the cap installed, watch the coolant level as it is should be going down slowly as it pumps through the system. Also check the seal on the raditor cap for any cracks's or visible damage.

The temp sensor is a possibilty but a rare one at that.

Hope this helps again

Jul 04, 2008 | 2002 Mitsubishi Montero

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