Question about 2002 Mitsubishi Montero

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Still Pegged at Max Hot even with new Tstat

The check engine light (actually Service Engine Soon) is NOT on. Interestingly enough, while we were running the water pump test you suggested, the temp continued to climb as we were adding more fluid (which I am assuming means the pump was working since the fluid level continued to drop), but when we turned the car off and pulled the drain valve from the radiator and drained off about 2-3 cups, the temp gauge went down to normal operating temp. I climbed back up again when we turned the car back on. Any idea what that indicates???

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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.

Still Pegged at Max Hot even with new Tstat - c39c3b5.jpg

Posted on Jul 06, 2008

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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

Jul 04, 2008 | 2002 Mitsubishi Montero

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