Question about 2001 Pontiac Montana

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2001 Pontiac Montana overheating

We changed the thermostat and it is still overheating. Checked the coolant and it is fine. Also, now we are not getting any warm air when we turn on our heater, but we didnt have a problem with this before.

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You have air pocket in system let run with rad cap off you should see it burp after it does take down road full throttle should move pocket and gausge should go down.

Posted on Jan 05, 2009

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My 2001 Montana is overheating with fans running, full of coolant, new thermostat what else could cause overheat besides small intake leak


head gasket and/or cracked head..notorious for it, usually rear head, but if ya pull it down do both head gskts and send heads outto be checked for cracks

Apr 17, 2012 | 2001 Pontiac Montana

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2002 pontiac montana overheats


i would 1st check the thermostat, most overheating problems result from the thermostat sticking closed, and not allowing the coolant to circulate, while you are doing this, check the upper and lower radiator and heater hoses, to make sure that they are not collasping, also check the coolant temperature switch. this switch is normally located on the top of the intake manifold, most of the time, not too far from where the top radiator hose is connected. hope that this information has helped you.

Mar 30, 2011 | 2002 Pontiac Montana

1 Answer

I have a 2005 pontiac montana and i am having trouble with it over heating, i have changed the water pump, thermostat, heat sending unit, drained and flushed the radiator and purged the air out of the...


Sean I have a 2004 Montana and mine is also overheating. I just paid Pep Boys $300 to replace thermostat and it is still overheating. They checked for coolant leaks, water pump is okay, the pressure checked out ok. No air in the system, etc. Today I brought it to a different mechanic and he says my cooling fan is kicking in very slow after the temp gauge goes 3/4 up which is not supposed to happen. My fan does not have a relay and he said it is either the temperature sending unit, but most likely it is the COMPUTER which is going to a very, very expensive repair. He said this happens a lot with Montanas! I am pissed. I just bought it used and the previous owner probably dumped it b/c he knew it needed a computer. Also the Fuel gage does not work and it will cost $800 to replace the fuel tank which contains the fuel sensor.

Dec 24, 2010 | 2005 Pontiac Montana SV6

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Vehicle overheating quickly. changed thermostat it ran fine for about 2 weeks, now it is overheating quickly again. no leaks are coming from water pump. Do not see any water leaking anywhere, but when it...


Hi, check you have heat coming out the heater in the car put it on hottest setting and see what happens if it comes out cold then the chances are the head gasket has gone and is pushing gasses into the coolant system causing an air lock and then over heating.

check the oil for signs of a white substance look on the oil level stick and also inside the oil filler cap if their is any signs of milky substance then this is proof head gasket has gone.

let me know what you find out ok

Sep 10, 2010 | 2001 Pontiac Montana

1 Answer

2000 Montana heater problems. Only get very little heat in warmer weather. Temp guage doesn't always move. A/C and air flow are both fine. What could this be?


Your thermostat may be stuck open. Your cooling system could be low on coolant, but if that was the case your temp gauage should still move.
Would probably start with a thermostat-you may even have trouble code stored for the thermostat(P0128).

Oct 02, 2009 | 2001 Pontiac Montana

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Coolant problems related to transmission?


tran should be ok need to take head to repair shap and be sure head is ok and not cracked. thermostat, radiator, or cap, hoses need to be checked to dtermine what caused it to run hot also check engine fan. Pls rate this solution

Feb 17, 2009 | 2000 Pontiac Montana

2 Answers

1999 Pontiac Grand Am Overheating


It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.

Nov 19, 2008 | 2001 Pontiac Grand Am SE

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