Question about 2002 Mitsubishi Montero

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Still Pegged at Max Hot even with new Tstat

Any other ideas on fixing the temperature gauge problem on the Montero? Could it be a bad temperature sensor?? Water pump?? Just throwing out ideas???

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  • ozone1963 Jul 13, 2008

    2001 Mitsubishi Montero temperature guage on max while engine is running: I took it to MIDAS six months ago for problem and was told that the head gasket on passenger side was leaking and that was causing the probblem. (The cooling sytem check that they performed was OK.) The head gaskets, timing belt, and thermostat were replaced. The problem did not go away. I was then told that it was one of two temperature sensors and that a Mitsubishi dealer would have to replace. I was assured that the cooling system was working properly, even though the guage continues to read at max. Service engine light came on today and stayed on. The odometer reads 87,100 mile. Might the two be connected?

  • Alex_Tx_LDO Dec 11, 2008

    Hey everyone, well seems i have a very similar problem replaced the thermostat and still my engine heats up bad and starts to turn off on me and wont accelerate only when hot though. i also fixed a coolant line that busted at the bottom, how would i go about checking the pump and radiator cap ? thanks for the help



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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

Posted on Jul 05, 2008

  • Patrick McGee
    Patrick McGee Jul 05, 2008

    Is your check engine light on?



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Hi again,

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

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 19, 2008 | 2002 Mitsubishi Montero

1 Answer

Have you repaired the temp gauge issue

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

1 Answer

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.


Jul 05, 2008 | 2002 Mitsubishi Montero

4 Answers

Temperature Gauge Is Pegging at HOT

Same problem on 2002 Montero XLS. Since manuals are impossible to acquire, I subscribed to (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.

Jul 04, 2008 | 2002 Mitsubishi Montero

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