Question about Pontiac Montana

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Heating problem for 2008 Pontiac Montana 3.9 liter engine, only heats up in front when stepping on accelerater, and straight cold in back

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1] The main cause is usually the radiator being low on coolant.
Check it at the radiator and NOT just the coolant recovery tank.
Make sure the radiator is full right to the top & let it idle for 10 or
more minutes to make sure it stays full.
2] If the cooling system has been worked on recently, the system
may have air in it. Will require bleeding the air out.
3] If the van has a LOT of miles on it, and has had little or no
cooling system maintenance, the heater core could be badly
plugged up. Would then need to be replaced. Big job.
4] I was going to suspect the water pump maybe, BUT scratch
that. If the pump was bad you would also be overheating.

Posted on Nov 26, 2014

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I would suggest checking the coolant level in the radiator when the engine is off and cold.

Posted on Nov 26, 2014

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  • 40 Answers

Sounds like a vacuum leak. These sorts of functions are often vacuum operated and a vacuum leak will cause it to act up. A good shop can pressurize your vacuum system with a smoke machine to expose your leak/s. If it's electrically controlled, there's most likely an electrical actuator that is defective. Sometimes they can be reset by disconnecting and reconnecting the battery. Sometimes it's a little more entailed than that.

Posted on Nov 26, 2014

Get into a shop Soon or-- a dealer-- if money is no concern

Snow & Cold time is here for most folks

Need to have the ENTIRE vehicle in the best condition
possible-- for the winter --reguardless of cost

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

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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

daves944
  • 1050 Answers

SOURCE: 2003 Pontiac Montana Front Wheel Bearings

Remove the wheel, remove the hub nut, remove the brake caliper and rotor, put your socket and extension through the hub flange onto the bearing retainer bolts, undo them, release the abs sensor connector if it has it, remove the bearing and hub flange as an assembly, put the new one on and go backwards from here. Torque the hub nut to 180 ft/lbs, your done.

Posted on Apr 08, 2009

  • 72 Answers

SOURCE: changing sparks plugs in a 2000 pontiac montana

remove the ignition coil pack ( 2 10mm bolts on front of it and 2 13 mm nuts on the back side) u will need a long extension and deep socket for the back ones , and unplug all electrical connectors and remove it from the vehicle and you should be able to reach the back plugs without a problem.

Posted on Jul 28, 2009

wireguy212
  • 1627 Answers

SOURCE: I have a 2005 pontiac Montana. The heat in the

Get the heater core flushed for the front heater,if the valve in the upper heater hose actually moves.

Posted on Nov 17, 2009

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SOURCE: 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

Posted on Dec 17, 2009

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1 Answer

2008 Pontiac Montana S6 Won't Start.


Sounds like the anti-theft/alarm system was triggered.
Have you tried locking and unlocking the driver door with the key to disable the alarm ?
And you need at least 12 volts to crank the engine so the battery may need to be charged up first.

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

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2001 montana is over heating and i replaced the radator and the thermasat and flushed it real good the water pump seems to be working


If the cooling fans are coming on and the upper and lower hoses are both hot than I am 99% positive you have bad head gaskets. It's not uncommon on the 3.4 liter engines. To confirm, with the engine cold remove the radiator cap. Start the engine and watch the coolant in the radiator. If you see a constant percolation of air bubbles coming out of the radiator that you more than likely have a bad head gasket(s).

May 29, 2011 | 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

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

2 Answers

I have a 2005 pontiac Montana. The heat in the


There is a flap in the venting itself that can get stuck. Or the actuator that moves it can become faulty. It is located above heater core and it's housing. You will have to remove bottom console to access it.

Nov 17, 2009 | 2005 Pontiac Montana SV6

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