Question about 2002 Pontiac Montana

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Pontiac montana 2002 coolant temp rising to red zone

On the highway today , light comes on for overheat , temp up to red zone. Turned AC off. I stopped and let it rest for 15 minutes until it creeped down, drove for 10 , repeating this 3 times. Only had a few miles left to get home. On one stop I decided after 10 minutes of rest, to loosen the cap so maybe it would go farther with no pressure built up.
Carefully loosened cap and even though it was not at all down to normal temp, there was no burst or spray, just gurgling out when I took it off completely. At this point, when taking off trying to get to cruising speed of 65, the gas pedal was not responding properly and could not rev the engine . It did get to 40 - 45 miles per hr and would stay there as long as I wanted but would not speed up normally. It would rev in park however.
What would cause the , I think, false overheating reading, and then the loss of pedal power?

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  • dlongphoto Dec 26, 2008

    Thank you for your quick response. There is no fluid coming out anywhere and the levels are normal . I did not add water during this at all because of that. Could it be the thermo? It seems like it never actually was as hot as the temp gauge said.

  • Handsfull3 Jan 23, 2009

    My Montana was/is doing the same thing. At first the light only came on when I was idling. And the heater did not work. I took it to a mechanic who proceeded to change the thermastat and the water pump. I drove it home (approximately 10 miles) with no problem. The heater was also working. The next morning I got about 1 mile and the light came on and I had the same problem with the acceleration as the other person. I had to stop and cool it down. I took it to another mechanic who flushed the radiator and I still had the problem. He then took a look at the thermastat and said that it was closed(?). I took it back to the original mechanic who changed the thermastat again. It worked for about 15 miles ( with the heater working also) and then just before I got into my driveway the temp went up and light came on. I also lifted up the hood and saw no steam or anything like expected from an overheated car. Help. I am so frustrated.

  • hosborne Jan 26, 2009

    Its 10 below here and my gage goes into the red then back down to nothing. Then all of the lights went dark and the engine dies. After about 20 minutes, We jumped the car and made it 10 miles to home warning lights all the way. The heater only kicks out warm air when you rev the engine to about 2000 rpm.

  • Anonymous Mar 20, 2009

    we were driving and we saw smoke comming out of the engine coolant was leaking. we had the hose that busted fixed. was working fine the temprature was fine but then it started to pass the half line then went back down please help me.

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You guys have head gasket problems. Need to have heads checked for damage and have head gasket repaired. A good mechanic can do it in 16 hours on a montana,

Posted on Jan 29, 2009

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You have gotten it really hot it sounds like, I would should check all my coolant levels as soon as it was cool and if you put water in it while it was hot you could have easily cracked a head. I wish I could be more helpful but if it didn't spew water out I am wondering if you have a leaking water pump or bust hose, or even if you could have a freeze plug out. Fill it up with water and let it sit and idle and see what happens. Good Luck, Hope this helps you! and Merry Christmas!

Posted on Dec 26, 2008

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