Question about 1999 Pontiac Grand Am GT

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I have a 1999 pontaic grand am gt. when the car idles it stays under 200 degrees but when i put it in gear all the coolant flushes out of the overflow valve. the engine starts to shake alot. what do i do to fix this.

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Check ur thermostat see if its working if not check oil and see if water is in it may have blown head gasket

Posted on Jul 20, 2010

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2 Answers

How do I fix a thermostat that sticks and temp goes to 250 degrees on a 1999 Grand Am. I put a new thermostat in


New thermostats do not stick. With the radiator full and the cap off check for air bubbles at idle. blown head gaskets blow bubbles

Sep 10, 2014 | 1999 Pontiac Grand Am GT

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Blower control


Sounds like a thermostat and/ or the system is low on coolant.
Its probably not going to reach 200 degrees when the outside air temp is below freezing, but you should get plenty of heat if the system is working correctly.

Jan 23, 2014 | Pontiac Grand Am Cars & Trucks

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My 1999 grand am gti is loosing antifreeze coolant into the engine. what can be the problem and is it expensive to fix.


head gasket, under $800 bucks, stay away from dealers..... and after this change coolant every two yrs and don't overheat it ....

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Once the car gets to op.temp it starts to run rough


it sounds like you might want to scan your vehicle for sensors evaluation to determine what causing your rough idle if you have engine light on

Jan 26, 2010 | 1999 Pontiac Grand Am GT

1 Answer

1997 pontiac grand am coolant fan not coming on when it needs to. Put new relay on as well. fan does work. what to do next?sometimes it will be on and also stay on but when car cuts off and go to cut back...


coolant fan should kick on when engine coolant reaches 190 to 200 degrees.the coolant temperature sensor resistance will drop.closing contacts allow the pcm to signal or turn on coolant fan.if coolant temoerature sensor is open or bad the coolant fan will not turn on.need to replace it.

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99 GrandAm GT v6 3.4L overheating


Can't give you a definite "fix" only because I'd need to do testing. But, two items you need to have checked are: 1. have a hydrocarbon test done fro the cooling system to verify that you do or don't have a head gasket problem. 2. have someone check the radiator with a "heat gun" to see if there are any cold spots. Home flush kits and sometimes even shop flush equipment will force cleaner around, not through heavily plugged areas and not clear the obstruction. Heat gun is best way of finding cold areas that are not flowing.
also...you mentioned fan relays...does the fan come on?

Oct 01, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Coolant Leak


it could be your thermostate . i do dont think its your intake.as far as putting the cap on to tight.. they are sopuse to be tight so you did not hert it . have a nice day

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1 Answer

99 pontaic grand am


sounds lie you might have an IAC valve problem

Mar 08, 2009 | 1999 Pontiac Grand Am GT

1 Answer

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I also own a 99 grand am 3.4L
The coolant fans will not come on until the engine temp gets to about 220 degrees.

if they do not come on the relays are located under the hood in the covered panel near the LF strut tower.

also the fans should run constantly when the A/C is turned on.

good luck

Jun 25, 2008 | 1999 Pontiac Grand Am GT

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