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nichols706
New User
Sep 25, 2008, 11:18 AM
Post #1 of 2
(1876 views)
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94' Grand Am overheating
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94'
Pontiac
Grand Am
2.3
120,000 miles
in the middle of spring I left the vehicle running outside with the a/c running for about 20 minutes (yeah I know, smart move) when I came outside the noticed that antifreeze was overflowing from the coolant reservoir and on to the ground. I shut off the car to let it cool down and replaced the coolant. That only happened that once. Now here we are towards the end of summer & all of a sudden it started seeping out again except now it's really bad. The temp gauge goes way up then it backs down and the low coolant light is constantly on. When I come to the car in the morning there is fluid all over the ground and the outside of the reservoir is soaked with the water that I had filled it with the day before. I thought is was the thermostat so I replaced that today. That wasn't the answer. It still does the same thing and this is where I am. Oh just letting you know that the A/C & heater works fine. Thank you for any suggestions
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 25, 2008, 6:46 PM
Post #2 of 2
(1869 views)
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Re: 94' Grand Am overheating
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Sounds like air in the system and the question is why. It's clearly overheating by your observations so the wet all over the recovery tank isn't surprising by itself.
Wish there was a list of cars with and without but have to ask if this one has a radiator cap on the radiator or just the cap on the reservoir? If just the reservoir you really don't know if the radiator is full and the low coolant light is telling you so as it should be monitoring the radiator's level and probably not at the tank you look at.
A bummer is that a head gasket can do this by allowing combustion gasses into cooling system which act like air and will blow coolant to the reservoir and overheat and sometimes correct while you watch but it's only temporary.
A pressure test would help to diagnose that.
Also - are you sure cooling fan is coming on? Several vehicles can behave with an inoperative one if moving along at fair speeds and needs it most when stopped or going slow. A/C should have a fan on about all the time A/C is on or requested.
All that needs checking,
T
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