Question about 1999 Pontiac Montana

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Pontiac Montana '99 Water Thermostat removal

Can I remove the water thermostat of my Pontiac Montana 1999 because of overheating problem

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  • oluwolesegun Apr 29, 2009

    Thanks. I do not need the hearter really, it is the AC that I need instead.



    Should this means that the engine is not likely to develop fault as a result of runing the car without thermostat?

  • oluwolesegun Apr 29, 2009

    Thanks you, I will try it.

  • oluwolesegun Apr 29, 2009

    Thanks.

    Could "Late-model" "computerized" engine means 2000 model and above or does it include the 1999 model?

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

Posted on Apr 29, 2009

  • Samuel Charles Spriggs Apr 29, 2009

    I doubt that the engine will develop serious problems, but I haven't seen this done on a "late-model" "computerized" engine.

  • Samuel Charles Spriggs Apr 29, 2009

    It includes 1999 engines.

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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?


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Why is it overheating?


Might be the thermostat. Check it

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My 99 pontiac montana has a heater problem.after engine is warm the heater blows warm air for a few minutes and then blows cold for a few minutes and then warm again. sometimes it blows warm for a few...


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try priming the engine block & radiator with water though the hose's & any hose you can squeeze to pump out the air lock with the filler cap off when running, sounds too much air is is in the system & the pump won't work dry.
I had this problem a few times & I ended up practically forcing water into any hose I could re-attach quickly using a garden hose, as the heating system need's priming too !

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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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That leaves radiator or radiator fan problem or wrong thermostat. Did you or a mechanically inclined friend do the repairs ?

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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.

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