Question about 2000 Pontiac Montana

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Van overheating Have recently replaced water pump and thermostat in my Montana. Radiator is roughly a year old. There seemes to be no circulation of coolant as pressure seems to push all of it into reservoir. Can drive down the road and will do fine and then it will suddenly red line and hot coolant light comes on. Thought rad cap was bad and tried another but to no avail. Does this mean there is a blockage somewhere??

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  • Pontiac Master
  • 1,456 Answers

Pushing coolant into the reservoir is a symptom of a bad head gasket. Have the coolant check for combustion gasses. Easy test.

Posted on Aug 01, 2017

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6ya6ya
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Posted on Jan 02, 2017

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jturcotte
  • 8531 Answers

SOURCE: temperature gauge went up. put coolant in

Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat and let me know if you have questions

Posted on Sep 09, 2010

DillyWackSac
  • 195 Answers

SOURCE: 2002 pontiac montana overheats but

Either you have not bled the system, or possible fan not working, or head gasket problem. Solution

Step by Step
1. Check both hoses, do both have equal amount of pressure?
2. Run the vehicle where your gauge shows in the middle, shut the vehicle off then open the bleed valve near the heater line and wait till fluid comes out like a steady stream. Make sure you do not go low on coolant.
3. Turn on vehicle, turn on A/C high maximum blow check to make sure both fans are on. We are testing to make sure the fans at least work!.
4. After all this and you are still boiling over make sure your radiator cap is good if not then replace. Last but not least get a block tester to test for exhaust gases in the coolant. Rent one from autozone. $25.00 plus fluid which is about $8.00.

Posted on Sep 15, 2010

mgomez0824
  • 351 Answers

SOURCE: engine over heating.. just added a gallon of

you can leave the cap off the same way to check to is if it is circulateing,is your water pump leaking? if your loseing coolent.

Posted on Jan 30, 2011

dttech
  • 4803 Answers

SOURCE: i changed water pump and thermostat the car get

It sounds like a blown head gasket to me.

Posted on Aug 22, 2011

SOURCE: Why does it keep overheating 2003 Pontiac Grand AM V6

Head Gasket still--- not done correctly

Posted on Jun 16, 2012

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1 Answer

My 99 Pontiac Montana Keeps running Hot.I replace the thermostat , Coolant Sensor..Is It possible that the water pump Is Bad?


The radiator may be plugged or the head gasket can let compression gasses into the radiator . To check, run the engine without the radiator cap and look in to see if there any bubbles in the coolant. If there is a lot of coolant moving in the radiator after the T/stat has opened, the water pump is ok. If not then suspect the water pump is not circulating enough water.

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You are spot on. Bad water pump. It is also probably the reason your timing belt was frayed. The water pumps of later model cars usually drip some through a "weep" hole in the bottom when they are going out as a kind of warning "Hey, you gotta get me a replacement soon!" But unless you live where no air conditioner is ever needed, or used, most people think it is the drippings from the AC. Get that pump replaced ASAP and when done, do a compression check on all your cylinders to make sure there was no head gasket damage from overheating. Good luck.

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2001 pontiac montana overheating whats is pump rotation. n serpentine belt diagram


You paid a shop to work on an overheating problem ,
or other issues & they failed to resolve things

Take it back

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I have a 2002 Olds Intrigue; standard 3.5, 116K miles; Problems started with a minor water leak; first mechanic replaced the Throttle Body gasket; second did an extensive pressure test on the coolant...


most likely heater core and to check if the water pump working..allow vehicle to warm up enough for thermostat to open and check for circulation in the fluid inside the radiator..if see it..water pump works.

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How do you know the thermostat is ok? If in doubt replace it. Water pumps are a even bigger what if. Did he do a radiator flush? Cooling system flush of the engine? Cooling fans come on at what temp and go off when? Replace the engine temperature sensor? 6 years old is bound to have sensors and such go bad.

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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.

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the impellors in the water pump are prone to corrosion,especially if no or incorrect radiator additives have been used .this will cause water to stay in motor & boil whilst the water in the radiator stays cold because it cannot circulate.try flushing radiator ,installing a new thermostat (which is more than likely not opening )& radiator cap,refil with correct additive,.if the car still over heats then you will need to replace the water pump.bugger!!

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2000 Pontaic Montana


I have a 2000 montana and mine was doing the same thing. I replaced intake manifold gaskets, thremostat, and water pump. Turns out it my heads were warped. I had them taken to a machine shop and it has seemed to fix my overheating problems.

Oct 21, 2008 | 1999 Pontiac Montana

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