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Just replaced ect sensor in 04 pontiac montana with 3.4 motor after the engine would run hotter than normal, but not overheat. temp goes down while driving but climbs slowly at idle until fans kick on to run the needle back down to halfway...still doing this with new sensor but seem a little better than before...fans work, no leaks regarding coolant, did not check thermostat as i didn't seem to think this may be the problem any ideas?

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You should replace the thermostat anyway, as they get older they do not function properly and it may be the reason your temperature swings are so erratic. It is not a big repair to replace it, you can do it yourself if you are handy for less than $25.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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Where is coolant temp sensor on1989 isuzu 2.6 efi engine


engine coolant
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There can be 3 sensor.
not posting what doent work makes this impossible.
engine ECT reads wrong
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My 01 Pontiac Montana is trying to overheat at high power


If your vehicle doesn't actually overheat, just getting hot, I think that's the normal behaviour for these cars. My 03 AWD behaves the same way. When driving uphill, especialy when towing, the temperature rises close to the red marking, but I have never experienced it overheating. I think that the temperature has to rise much over the normal driving temperature to activate the two electric fans.

Jul 15, 2014 | 2001 Pontiac Montana

1 Answer

Engine overheating on low rpm


Could not agree with you more - was thinking that it was a circulation problem with coolant when you mentioned your suspicions.

May 04, 2017 | 2006 Pontiac Montana SV6

1 Answer

Vehicle overheating replaced thermostat gets heat then goes cool but when i rev the engine it starts to blow hot heat the more i rev the hotter it gets


Air in system, bleed system manually by filling up reserviour then drive until operating temp. Leave vehicle to cool 2hours or so then refill again. repeat until heat is steady and guage stays normal

Oct 14, 2010 | 2000 Pontiac Montana

1 Answer

Temp gauge goes into the red while driving then back down to normal levels. Pulled over and checked the coolant level. Overflow was half full and the radiator cap was cool to the touch.


your thermostat is not opening there for not allowing hot coolant to exchange into the radiator. replace thermostat.also causing you to overheat

Jan 17, 2010 | 2002 Pontiac Montana

2 Answers

Pontiac Montana overheating


How do you know the thermostat is ok? If in doubt replace it. Water pumps are a even bigger what if. Did he do a radiator flush? Cooling system flush of the engine? Cooling fans come on at what temp and go off when? Replace the engine temperature sensor? 6 years old is bound to have sensors and such go bad.

Jun 16, 2009 | 2001 Pontiac Montana

1 Answer

I want to know where the Coolant Temp sensor is on a 04 2.4 PT


the engine coolant temp sensor is in the assembly that the pressure cap (radiator cap) goes on. it's under the part that the cap goes on, closer to the engine block. you can see the wires and the plug going to it. here's the remove and replace step by step:
1. disconnect battery negative terminal (they always tell you to do that when you work on electrical parts)
2.partially drain cooling system below level of ect sensor
3.disconnect ect sensor
4.remove ect sensor
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2.connect sensor electrical connector
3.connect battery negative terminal
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2 Answers

Over haeting


Had the same problem....turned out to be the water pump.

Jan 13, 2009 | 1999 Pontiac Montana

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