Pontiac Montana

What would stop the thermostat from opening on a 2002 Pontiac Montana?


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2012-01-10 15:13:03
2012-01-10 15:13:03

It doesn't matter. A thermostat is a non-serviceable item. If it is bad, you replace it. That probably isn't your problem though.

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The primary cause of a thermostat malfunction is corrosion. It prevents the thermostat from opening and closing as it normally would.

Follow the top radiator hose, to where it intersects with the motor. This would be the thermostat housing. Remove this, and the thermostat will be exposed.

The gas tank in my extended 2000 Pontiac Montana is 25 gallons. I would imagine the 02 is the same.

Insufficient amount of coolant or thermostat not opening

A common problem with the Montana is the power steering pump.

Two symptoms of faulty thermostat which would more than likely require replacement of same: (1) engine overheats quickly (2) engine takes too long or doesn't reach normal operating temperature

One thing that would cause your 1999 Pontiac Montana to stall at idle is the idle being set too low. You should raise it to see if that fixes the problem.

I would start by checking the thermostat, it may not be opening.

either faulty thermostat not opening soon enuff, or wrong temperature thermostat still not opening soon enuff

I have a 2000 Pontiac and my was doing the same thing. It turned out to be my heads were warped. You can smell it coming out of your tail pipe if it is your heads.

check the cabin filters inside the glove box, if theyre clogged that will cause low heat it happened to my wifes 2000 silhouette

not really. the only thing i would change though is the thermostat. Try to get a lower opening temperature thermostat.

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Your question would be better answered if reposted including the year of your car.

The normal direction of circulation in the coolant system would push the coolant out the thermostat opening.

Thermostat may not be opening to allow coolant to flow through heater box. Thermostat may be opening too soon allowing cold coolant to flow through heater box. Either way thermostat needs replacing

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You more than likely have a bad water pump. With the car running, open your radiator cap and see if the water is circulating through the radiator. If not, then your water pump is bad. Hope that helps...

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