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Old 10-16-2012, 10:15 AM   #1
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Default Grand Am Overheating

I have a 2003 Grand AM. I changed the thremostat and it still overheats. It only overheats when the car is cold. i turn it off and wait a coulpe of minutes and it cools down and then no problems. Any ideas?
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Old 10-16-2012, 10:22 AM   #2
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Did it start overheating after you changed the thermostat, or was it overheating prior to changing the thermostat?
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Old 10-16-2012, 10:43 AM   #3
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It was overheating prior. It showed all the symptoms of a bad thermastat.
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Old 10-16-2012, 11:38 AM   #4
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did you blead the air out of it whenyou changed the thermostat, on the 3400 i think there are a couple screws
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Old 10-16-2012, 11:40 AM   #5
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There are only 4 things that can cause an overheating issue.
1. Sticking or upside down thermostat.
2. Lack of coolant.
3. Faulty water pump(vanes rotted away-but unlikely due to age of car)
4. Or gummed up cooling system.

What engine do you have??

When was the last time the cooling system was flushed?

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Old 10-16-2012, 12:00 PM   #6
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I have a 3.4L 207CI V6. It had a all new cooling put in about 75,000 miles ago. I filled the coolant after i changed the thermastat. I believe I bleeded all the air out of the system.
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Old 10-16-2012, 12:34 PM   #7
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Quote:
Originally Posted by Mike1995 View Post
There are only 4 things that can cause an overheating issue.
1. Sticking or upside down thermostat.
2. Lack of coolant.
3. Faulty water pump(vanes rotted away-but unlikely due to age of car)
4. Or gummed up cooling system.
I'll add a few more:
  1. Blown head gasket. The oil may or may not be milky. Check it.
  2. Fans not coming on. Could be a bad ECT sensor, low speed relay, high speed relay, fan motor, etc.
  3. Rad cap not sealing to rad filler neck. You have a sealed and pressurized coolant system. If open to atmosphere the coolant will boil at a lower temperature.
  4. Overflow reservoir cap not sealing. Same comments on sealed system.
Some Grand Am owners have corrected this with installing a new overflow and reservoir ($30???). Blown head gaskets are a common issue with your engine. If your local Autozone has a coolant pressure tester, pump it up to the recommended pressure to see if it holds or bleeds down.

Try bleeding the coolant system while parked on an up-hill slope.
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