Question about 1998 Pontiac Grand Prix

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1998 grand prix low coolant light keeps coming on thermostat,hoses,radaitor,and intake gaskits have been replaced...the radaitor is full everytime i check it

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  • Pontiac Master
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If the engine is running well and not running hot, chances are that the coolant level sensor has failed. You can either replace it or ignore the warning light and just check the level as "routine maintenance"
while checking your oil and other fluids weekly as every good vehicle owner does and has done since there were cars to drive.

Posted on Mar 31, 2011

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2 Answers

Coolant light on and leaking coolant... now white smoke and car will not start


You really won't know until you take the intake off.
There could be other problems that caused the leak before the intake cracked.
Until the intake is replaced you won't be able to do a pressure test of the cooling system.
Make sure the thermostat is replaced since it could have been damaged from the overheating episode.

Mar 08, 2013 | 1998 Pontiac Grand Prix

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How to bleed coolant system


I have caps that fit the tanks that will allow pressure to vent thru the overflow tank.
Sometimes you can run the engine with the cap off and keep filling too.

Jul 01, 2012 | 1998 Pontiac Grand Prix

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How do you change the thermostat on a 1999 grand Prix gtp 3800?


The t-AT&T is located under the housing that is bolted to the intak manifold on the drivers side he the upper radiator hose is attached to. Remove the radiator hose from the housing. Remove the two bolts holding the housing to the intake manifold (a 10mm socket will work for this). Remove the housing. Remove the t-stat. Clean the mating surfaces of the t-stat housing and the intake manifold. Install the new thermostat. Install the housing. Reattach the hose to the housing. Top off the coolant in the radiator. Start the engine and let it idle until the cooling fans come on. Keep an eye on the coolant level in the radiator and top off as necessary. Once the fans come on replace the radiator cap and you should be good to go. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Jan 20, 2012 | 1999 Pontiac Grand Prix

1 Answer

Where is the engine coolant temp sensor located on a 2004 grand prix gt


On the 3.8 liter the coolant temp sensor is right below the the thermostat in the intake manifold on the drivers side of the engine.

The thermostat is under the housing that is bolted to the intake plenum that the upper hose is attached to.

Jan 18, 2012 | 2004 Pontiac Grand Prix

1 Answer

Cooling system leak some where


There's a dye that makes your coolant show up neon under an ultraviolet light. Stop throwing parts at it and troubleshoot/inspect, and keep in mind you could have an internal leak (aka intake or head gaskets). Check to make sure your oil isn't milky and/or way overserviced.

Nov 17, 2011 | 2004 Pontiac Grand Prix

2 Answers

The heater doesn't warm up in my 2005 Grand Prix. The blower works, but no heat! Is it just a thermostat or am I looking at something more expensive to fix?


if the tempature gauge reads normal warm the vehicle up and feel the heater hoses wich are located on the right side of the vehicle if one is alot warmer than the other you probaly have a plugged heater core remove the hoses and take the hoses off and run a hose through one of the hoses until it comes out clear. it could also be just low coolant and topping off the coolant could solve this problem temporaily but if it is low it is leaking.

Dec 15, 2010 | 2005 Pontiac Grand Prix

1 Answer

Friends car(2001 pontiac grand prix) 3.8 v6.started running hot,so he replaced thermostat. didn't help. so replaced water pump. helped very little. heater hoses cold to touch and blows cold inside. worked...


yes, but it's designed to drive the air out as long as you open the cap and run it until it's hot, keeping the radiator full. Eventually the air will come out and heater hoses should get coolant.

Sep 24, 2010 | 2001 Pontiac Grand Prix

1 Answer

My problem is, my 98 grand prix is getting really hot and the little light comes on that i think is a picture of a rad but not sure. could this be the thermostat or something elsé


It could be a thermostat. It depends on a lot of things. Check your radiator / reservoir levels, your water pump, your thermostat, etc. Also, check your coolant hoses to make sure they are not soft in any areas. Mushroom or ballooned areas are bad as well.

Mar 19, 2010 | 1998 Pontiac Grand Prix

2 Answers

98 Pontiac Grand Prix Overheating


YOU NEED TO REPLACE THE UPPER INTAKE MANIFOLD. ALSO, YOU WILL NEED TO REPLACE THE LOWER INTAKE MANIFOLD GASKETS. THIS IS A MANUFACTURING FLAW. THE PLASTIC INTAKE CRACKS CAUSING AN INTERNAL COOLANT LEAK. YOU CAN RESEARCH THIS ON LINE.

Apr 22, 2009 | 1998 Pontiac Grand Prix

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