Question about 2003 Pontiac Montana

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How to change a bad thermostat on a 2003 3.4L pontiac montana

I want to change my thermostat from my 2003 pontiac montana because im not getting no heat in the van

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  • Pontiac Master
  • 1,449 Answers

Put in a radiator flush ,run it for 20 miles it can be a blocked core in both the radiator and the heater.that should clean it. then refill with a 50/50 mix anti freeze then bleed it of air. put your heater on full .run the engine on tick over.then push in the radiator hose to push the air out of the expansion bottle cap .it is off . then refit your cap.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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SOURCE: replace thermostat 2003 pontiac montana

yes but with the right shaped wrenches and tiny hands it can be done without removing the exhaust crossover pipe

Posted on Oct 16, 2008

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SOURCE: 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.

Posted on Jan 29, 2009

  • 371 Answers

SOURCE: 2001 pontiac montana overheating no warm air when heat is on

Might be a weak or failing water pump... Does it leak antifreeze or do you have to add antifreeze very often? When the engine gets to operating temperature squeeze the top radiator hose and see if you can feel pressure from the water pump forcing water through it.

Posted on Feb 21, 2009

Molson02536
  • 3854 Answers

SOURCE: Changing spark plugs in a 2000 Poitiac van.

There are a few ways to doing this, and it takes time and a few band aids. You can remove the alternator to give you some room to access the rear spark plug with an extension and swivel spark plug socket. You can also get to the plugs from under neath if you have a ramp and long arm, an extension and swivel spark plug socket will help. You may have to use a 2x4 to wedge the engine to give you some room if you have larger arms. The other way is to tilt the engine forward by disconnecting the two top engine mounts. First replace the 3 front plugs and wire one at a time so you don't cross them. After you have changed the front plugs have a friend help you. Make sure the parking brakes are on and disconnect the two top engine mounts, release the parking brakes and let the transmission in park. Push the van forward slowly to tilt the engine forward far enough to give you room with out pushing it to far in to the radiator. Put the parking brakes on again to keep the van from rolling back and place a block of wood behind and in front of the rear wheels. Don't want to lose an arm. Replace the rear plugs with extensions and a swivel spark plug socket. Note, your going to have to replace the spark plug wire since the rear ones are really hard to remove and pulling on then will destroy them, not worth the headache trying to save them. Use platinum plugs so you can get 100.000 miles before you have to change them again so use anti-seize on the plugs so you can remove them again. Good luck and hope this helps, I personally go from under the van. 

Posted on Jul 06, 2009

  • 262 Answers

SOURCE: how to change thermostat on a 2002 Pontiac Montana

I believe the Montana has a 3.4 Liter V6 Engine.
This thermostat is located under the exhaust "crossover" pipe that runs between both the front and rear cylinder heads. Divers side.
Remove the heat shields (10mm bolts) and then the nuts on the exhaust studs. (6 total)
Two bolts hold the T stat housing to the intake.

Posted on Feb 24, 2010

Testimonial: "thankyou for this information, Do I need to remove the throtle above the thermostat housing?"

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Follow the radiator hose back to the engine. Where the hose meets the engine is where the thermostat is. Should be two or three bolts holding the fixture on. Inside of that fixture is the thermostat. Make sure the engine is cooled down and make sure to replace the coolant that you will lose changing this. Easy fix.

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99 pontiac montana overheaten already changed thermostat what is it?


you have a GM common problem and that is a bad intake manifold gasket. GM change the gaskets to plastic and they crank and leak causing over heating. here is a picture of one i took from a 2005 pon. bonneville with 74,000 miles on it2_12_2013_3_00_09_am.jpg

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1 Answer

How to replace thermostat


whats the cost on getting a thermostat changed,i was gonna get a radatior flush but advised not to until i changed my thermostat it worn out i guess is what im saying,

Aug 31, 2010 | 2002 Pontiac Montana

1 Answer

My pontiac montana 2001 is over heating, i have bleed the air lock, so i believe i need to change the thermostat, suggestions on how to change


Sounds like your head /intake gaskets are leaking better get system ckecked and compression test done soon .....It may cost more later

Aug 14, 2010 | 2001 Pontiac Montana

1 Answer

How to change thermostat on a 2002 Pontiac Montana


I believe the Montana has a 3.4 Liter V6 Engine.
This thermostat is located under the exhaust "crossover" pipe that runs between both the front and rear cylinder heads. Divers side.
Remove the heat shields (10mm bolts) and then the nuts on the exhaust studs. (6 total)
Two bolts hold the T stat housing to the intake.

Feb 23, 2010 | 2002 Pontiac Montana

1 Answer

Help please need to change thermostate


OK FOLLOW YOUR TOP RAD, HOSE TO YOUR ENGINE THAT WILL BE THE THERMOSTAT HOUSING ON A 3.4 IT IS BEHIND EXHAUST CROSSOVER PIPE THE BOOK CALLS FOR YOU TO TAKE THIS OFF. ONCE YOU GET IEXHAUST OFF THERE IS TWO BOLTS ON THE HOUSING PULL THEM PAY ATTEN. TO WHICH WAY THE THERMOSTAT IS SETTING (VERY IMPORTANT) THEN PUT TOGETHER IN REVERSE. P.S I HAVE DID THIS WITH OUT PULLING EXHAUST PIPE.

Feb 12, 2010 | 2002 Pontiac Montana

1 Answer

Pontiac Montana '99 Water Thermostat removal


Yes, it can be removed and run without the thermostat. However, your gas mileage will suffer and the heater may not work very well.

Apr 29, 2009 | 1999 Pontiac Montana

1 Answer

Need to replace thermostat on pontiac montana van.


public library...Chilton or Haynes auto repair manuals or collisionrepairadvice.com     make sure you bleed the system

Mar 30, 2009 | 1999 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

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