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Pontiac Forum: 2005 Grand Prix Overheeating
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  #11  
Old July 14th, 2018, 09:50 PM
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when the engine is completely cold is the engine coolant at the proper level?
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  #12  
Old July 15th, 2018, 11:02 AM
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Quote:
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when the engine is completely cold is the engine coolant at the proper level?
Ok. The coolant in the reservoir is low as always. If i were to fill it up and crank up the car, it would drain until it's back to the low point. The radiator is filled up with antifreeze to the point where if I added a little bit of water, it would overflow.

I'm not sure if these are the proper levels.
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Old July 15th, 2018, 12:05 PM
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the radiator, if it has a separate cap, is supposed to be completely filled. The coolant recovery bottle should have a mark on it for cold level and you should add some distilled water to bring it the cold level. If there was air in the system from replacing the pipes it may take a few days of using the car to purge the air.
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  #14  
Old July 15th, 2018, 12:18 PM
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Quote:
Originally Posted by melsg5 View Post
the radiator, if it has a separate cap, is supposed to be completely filled. The coolant recovery bottle should have a mark on it for cold level and you should add some distilled water to bring it the cold level. If there was air in the system from replacing the pipes it may take a few days of using the car to purge the air.
Yes. The radiator has a separate cap and it's completely filled now; topped off with cold water. I checked the coolant reservoir tank for markings but can't see any due to it's position in the motor. I'll give the car a few days to purge the air. Thanks for the helpful information.
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Old July 29th, 2018, 10:27 PM
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The temp hand is now going up to but not into the red zone. This occurs after driving for about 30 minutes. A check of the radiator shows that it's full of antifreeze and there are no leaks in the engine. The mechanic mentioned that the radiator fan has two speeds and it's probably not kicking up the speed after driving for an extended amount of time. He also mentioned the head gasket but I'm not sure what he's referring to. Could these cause high temps even though there are no leaks?
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Old July 30th, 2018, 10:14 AM
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Either problem can cause the engine to run hot.
I believe you have two cooling fans. When the engine is running very hot are both fans running?
You or your mechanic can perform a hydrocarbon coolant test, buy it at a auto parts store, or your mechanic can perform a compression test to check for a blown head gasket.
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Old July 30th, 2018, 04:19 PM
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Quote:
Originally Posted by melsg5 View Post
Either problem can cause the engine to run hot.
I believe you have two cooling fans. When the engine is running very hot are both fans running?
You or your mechanic can perform a hydrocarbon coolant test, buy it at a auto parts store, or your mechanic can perform a compression test to check for a blown head gasket.
Both fans come on when the engine is hot but it can't tell if it's low or high speed. I'll have to let him perform those tests and see what's going on.
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