Question about 2004 Pontiac Montana

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My 2004 pontiac montana is heating up , I need to know where the thermostat is

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Follow the radiator hose from the top of the radiator. It will end at a small cover with 2 bolts that hold it on. Remove the 2 bolts and the thermostat is under that cover.


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Posted on Aug 31, 2010

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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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Blowing cold air no heat


make sure coolant is in radiator....if its full, thermostat may need to be changed.....if thats not it check heater coil

Jan 03, 2010 | 2004 Pontiac Montana

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2002 Pontiac Montana, No Heat, I put the temp control on


the cabel from the heat dial to the heater box behind the dash could be snaped or jamed thus not opperating the lever which operates the flap which open and closes the heat box next to the matrix. or if your coolant is brown in colour it could be your matrix is clogged with sedament and needs flushing out. or it could be your water pump not pumping coolant round your engine or it could be a knackerd thermostat i hope these will help you id start with the easyest first thermostat

Dec 17, 2009 | 2002 Pontiac Montana

1 Answer

The heater in my 2004 Pontiac Montana isn't putting out adequate heat. The blower is working fine.


THE 97-04 MONTANA HAS THE 3.4 ENGINE WHICH HAS AN ISSUE WITH FAULTY INTAKE MANIFOLD & HEAD GASKETS WHICH FAIL TO SUSTAIN CIRCULATION IN THE COOLING SYSTEM AND CAUSE AN INAEQUATE HEATING SITUATION. REPLACE WITH FELPRO GASKETS AND YOUR PROBLEMS ARE OVER, PROVIDING ENGINE IS NOT DAMAGED!

Dec 09, 2009 | 2004 Pontiac Montana

1 Answer

2002 Pontiac Montana Thermostat replacement


check the coolant level fiirst...if that is low it wont give you any heat.....to change the thermostat you have to follow the top radiator hose to the engine.at the send of it you will see a clamp take it loose...then you will see the thermostat housing its held in place by 2 bolts . once you remove them you have the thermostat....make sure you clean all the old gasket material off both the housing and mount.also make sure you get a new gasket.

Jan 29, 2009 | 2002 Pontiac Montana

1 Answer

Heating problem


Yes that is cool if it's correct. 195 F is approx.as low as you should have. I'd change it. Be sure to run with cap off, and heater on (not defrost) while refilling system. Wait for rad fan to come on 2 or 3 times before you put cap back on, then add coolant to return bottle as needed. Make sure rad fan only comes on when up to normal running temperature. If it runs all the time, it may be causing low coolant temperature too.

Jan 25, 2009 | 2004 Pontiac Montana

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2004 Pontiac Montana blows cold air in defrost


There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!

Dec 22, 2008 | 2004 Pontiac Montana

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