car keeps overheating.. cant figure out what it is.. radiator hose blew and i replaced it but i had put the wrong coolant in but i flushed it and it was just a tint of green left in there so was just tired of doing it lol. but i filled it back up with the dex cool. and it is overheating now. hoses are very firm as if it were presuureized but seems like it is blocked somewhere. if i open the cap and realease the pressure the car will cool down to about normal but once i close it up and start driving again the car over heats again.

Asked by Dec 04, 2015 at 06:08 PM about the 1999 Pontiac Grand Am 2 Dr GT Coupe

Question type: Maintenance & Repair

5 Answers


Replace the thermostat and see if it improves. While your at it replace the rad cap too, those should be replaced every two years.

1 of 1 people found this helpful.

Sounds more like a bad thermostat but it could be an air pocket, this engines can be a real bear to get the air out.

i dont have a radiator cap mine goes straight through the overflow tank which is new. and the thermostat is not currently in becuase it was a previous problem. havent put it back in yet.


If you have no thermostat and you have excessive pressure you are looking at head gaskets, buy a block tester, it looks like a big turkey type baster, you put in the fluid that comes with the tester, place it in the overflow opening (because you don't have a rad cap) if the fluid changes colour you have exhaust getting in your cooling system, this is a faulty head gasket. The wrong antifreeze will not cause over heating

1 of 1 people found this helpful.

hmmm hope this isnt it ive already replaced the head gasket before. but i do have white smoke so this could be it =\ if so im most likely going to junk the car.

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