Question about 1999 Pontiac Grand Am GT

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Disappearing coolant 1999 Pontiac Grand Am

Coolant keeps disappearing engine overheating

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1999 grand am

'99 Grand Am have a plastic water outlet located on the back of the engine. (Same side as the battery). It is installed using a thin O-ring. Antifreeze is corrosive and weakens the O-ring causing a leak. Because of the location the leak can be almost undetectable. Replace the O-ring, but becareful not to break the water outlet.

Posted on Sep 18, 2008

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salsaurbana
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SOURCE: 1999 Pontiac Grand Am Overheating

It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.

Posted on Nov 19, 2008

SOURCE: Pontiac 2003 grand am low coolant light comes on

check if the engine is over heat,it it over heating ,definitely the coolant will dry,so check is,hope that clear your mind and help you

Posted on Sep 07, 2009

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SOURCE: my engine is always overheating and we can not

CHANGE THERMOSTAT.MOST OF THE TIME THERMOSTAT WILL CAUSE OVERHEATING.CHECK YOUR COOLANT MAKE SURE ITS NOT LOW.HAVE COOLANT FANS CHECK TOO SEE IF THEY TURNING ON.GET A DIAGNOSTIC SCANNER HOOK UP TO CHECK FOR COOLANT TEMPERATURE SENSOR FAULT AND FAN RELAY AND FAN FAULT. MAKE SURE FAN FUSE IS GOOD.

Posted on Nov 12, 2009

c17hydro
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SOURCE: where is the coolant sensor located for a pontiac grand am gt

It looks like this with a connector to it and is on the side of the engine block:

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Look right under the radiator hose.

Posted on Dec 01, 2009

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1 Answer

My 99 grand am is overheating. I changed the thermostat and it still over heats. what else can cause it to overheat?


How hot does it get in degrees F? Does the radiator fan work? Some fans won't turn on till about 220 degrees F.
Could have blockage in radiator or engine block? Check the water pump. Your serpentine belt ok? Could be gasket issues? Any coolant in the oil or oil in the coolant. Check your coolant temp sensor. Don't replace anything unless your testing points in that direction. Are you losing coolant?

Nov 04, 2016 | 1999 Pontiac Grand Am

1 Answer

Cooling system problem for Pontiac Grand Am GT 1999, Starts overheating when sitting still but starting the A/C helps cool it.


If it has an electric radiator fan (not AC fan) The radiator fan is not working. Possible coolant sensor or switch.

Apr 02, 2017 | 1999 Pontiac Grand Am GT

3 Answers

I have a 99 grand am that keeps leaking coolant an the person my girlfriend got the car from says he's done a few things to it but it keeps happening... just looking to find some possiblities before i...


Leaking coolant where? What engine does it have? Where does the coolant seem to be coming from? Front of the car, right front (in front of the passenger), left front, middle? Need more information than what you are giving...

Oct 27, 2011 | 1999 Pontiac Grand Am GT

1 Answer

1999 pontiac grand prix gt overheated. coolant is in the spare container, stem came from topside on the passenger's side. did not see fluid leaking and temp gauge had been up and down for at least...


Sounds like you have air in your coolant system. Take it to a mechanic shop to have them bleed the cooling system. That should cure your problem. Hope this helps. :) Please rate this. James Booth

May 18, 2011 | 1999 Pontiac Grand Prix

1 Answer

Loosing coolant almost as fast as its poored in. overheating


If your car has the V6 engine, the intake manifold gaskets are known to fail. they are plastic and the corners rot out . Since there is very little torque holding the bolts in place it doesn't take much for the coolant to leak.

Feb 13, 2011 | 1999 Pontiac Grand Am GT

2 Answers

Pontiac gp 02 overheating


thermostat should be replace on over heated engine, the spring loses tension, probaly not problem, most like head gasket if over heated severly, if you have a air pocket & wornt purge thats one sign,press test on cold engine let sit at start up run slightly rough may see & smell coolant at tail pipe, could also pull plugs may have one wet all crude checks, there is also chemical you put in coolant & use a a stripe for combustion I think napa or snap on sells, alsoyou could do tear down & inspection wish you luck not sure what engine or car you have grand am or grand prix my guess a GP with poss 3.4 more likely then 3800 engine

Aug 28, 2009 | 2002 Pontiac Grand Am

2 Answers

1999 Pontiac Grand Am Overheating


It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.

Nov 19, 2008 | 2001 Pontiac Grand Am SE

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