Cooling system

Asked by Kellymm Sep 07, 2016 at 07:33 AM about the 2000 Pontiac Montana Base Extended

Question type: Maintenance & Repair

I'm having problems with my van
overheating but only when it's less than 60
degress. It was fine all summer but with
our first cold night it said low coolant. It's
going somewhere but we can't find out
where and the heads are low  then we
bleed it and it's OK for a couple days

2 Answers
10

Guru9463ND answered 3 years ago

In the summer you ran your a/c. When the a/c is running the cooling fans should run at low speed. This was apparently enough to keep you satisfied with the car's temp. When you did not use the a/c, your fans were not on low speed. And apparently, the temperature sensor did not tell the fans to come on. Could be the water is low so the temp sensor did not figure out the car was hot. Could be the temp sensor is bad. Obviously refill the radiator and bleed it first. If more is needed check the sensor. The sensor is located near where the upper radiator house goes into the top of the engine and near the thermostat or under and at the front side of the throttle body.

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