Question about 2002 Pontiac Grand Prix

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I have antifreeze smell coming from my 2002 grand prix and no puddles and nothing wet found on engine had intakes replaced recently and had coolant flushed recently

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  • sollarsgochi Jun 29, 2009

    squeely if u would have read in comments already fixed gaskets but thank u i think it is seaping out of water pump just a little bit to make smell going to try to change it out

  • sollarsgochi Jun 29, 2009

    smell is outside of car not inside

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You are experiencing the exact same thing i have the past 6 months. whats happened is your intake manifold gaskets have failed and if you dont change them you will have major engine problems with the coolant mixing with the oil. gm made these gaskets from plastic and they have several known failures but did nothing to recall them. you are also probably experiencing the low coolant light that comes on every week or so? google "gm intake gasket failure on pontiac grand prix" and it will confirm what i have said. i just changed mine out last week. i took my time. it took me 3 days, 12 hours total, i had the right tools and know how. its a real pain in the ****, but my problem is solved. when you do this you also need to change the oil to get all contaminants out of the system. why you are at it i would also change the spark plugs on the backside closest to the firewall (this is the only way you can change those plugs anyway as well as good preventative maintenance). good luck...

Posted on Jun 28, 2009

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  • Master
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Check the FRONT carpet to see if it is wet, Possible HEATER CORE LEAK. Hope this helps

Posted on Jun 28, 2009

  • Eric Heifetz
    Eric Heifetz Jun 28, 2009

    Check the FRONT carpet to see if it is wet, Possible HEATER CORE LEAK. Hope this helps

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Better chk. heater core, it might have started to leak after you had the coolant flushed.

Posted on Jun 28, 2009

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  • Expert
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Did u check ur front floor rug? Coolant is circulated all threw the car there are two hoses that attach to (motor) wall that can leak inside.

Posted on Jun 28, 2009

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1 Answer

2006 pontiac grand prix smells antifreeze in car


Is there coolant leaking inside the car? Check the floor under the passenger side dashboard. If the carpet is wet your heater core is leaking.

If the floor is dry check the coolant elbows going from the block into the automatic belt tensioner. That's inside the engine compartment. They are notorious for leaking. You may not be able to see the leak because it drips onto the block and evaporates. That's what the smell may be.

Search google images for "3800 series 3 coolant elbow" to see the part I am talking about.

The only way to find a coolant leak is to pressurize the cooling system. You can rent a coolant pressure tester from an auto supply store. Pressurize the system and look for leaks. You may have a leaking water pump.

The elbows can be purchased from the dealer. The water pump you can get from an auto supplier. Might as well change the thermostat while you are doing the other repair. Drain the cooling system and refill with fresh dex coolant.

Make sure you bleed all of the air out of the system or the car will overheat.

May 08, 2014 | 2006 Pontiac Grand Prix

2 Answers

My 2005 Pontiac Grand Prix is overheating and leaking antifreeze, I add coolant every few days then the temp goes up and I have to add coolant again. There doesn't seem to be any smoke coming from the...


You should look under the car after it sits a while and see if there is antifreeze on the ground. If so try to see where it could be leaking under the hood directly over the puddle. You could have a leaking water pump. If so there would be dampness under the right side of engine compartment. Also check the radiator hoses at front of car.

Aug 10, 2011 | 2005 Pontiac Grand Prix

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I have a 1999 Grand Prix. It has a new water pump, new thermostat, new radiator cap, new hoses top and bottom off the radiator. Car is still running hot after a few moments. I don't hear no boiling...


Check to see if your electric fans turn on. Your fans are there to help cool the engine as well. Depending the setup will depend when they come on. Usually they are set turn on when your engine reaches a certain temperature to assist cooling the engine.

Jul 22, 2011 | 1999 Pontiac Grand Prix

1 Answer

I am leaking coolant from somewhere. when I run my car, the engine smells like hot coolant. I have checked the oil, and the coolant isn't mixing with the oil. I have read about intake manifold...


First, I am assuming that your vehicle is equipped with the 3.1L V-6 and NOT the 3.8L V-6? (Engine size is really nice to know in situations like this!)

It could be any where in the cooling system. The intake gaskets also like to leak externally. A bad intake gasket does not always mix antifreeze with the oil. Take a flashlight and look for coolant on top and/or down each side of the transmission bell housing. This is VERY common on these engines. It may be leaking just enough to where the exhaust crossover pipe is burning it up (and stinking) before it has a chance to run on the ground. Also look for stains on the intake manifold-to block mating surfaces and on the side of the bell housing that will indicate a leak. if your vehicle is still using Dex-Cool, the stains will be pink. If your coolant has been changed to green antifreeze, the stains will usually be real white or dark green depending on the brand and the severity of the leak.

If there are no leaks or stains in this area, then look around the water pump area for the same things. The radiator or coolant hoses (including heater hoses) could also be leaking. If it is stinking when the engine is hot, then you could get it hot then shut if off and look for steam.

TIP: A bright LED flashlight works really good for locating steam.

Jun 18, 2011 | 2002 Pontiac Grand Prix

1 Answer

Lossing antifreeze but no puddles we think its the antifreeze intake gasget?


if no puddles or no keaks you can see, then its probably your head gaskets, or the intake gaskets leaking. look all around intake to see if you see any leaks. if you do its your intake gaskets. how does the coolant look! on my car when the intake gasket was leaking, it made the coolant look milky and a chocolate type mixture. so check it out first, the intake gasket. Coolant may flow through the gasket to the inside of the engine and mix with the oil. Pull the oil dipstick out and look at it. Oil mixed with coolant will have a thick consistency. Examine the oil filter cap for any rusty-looking residue. good-luck.

Feb 14, 2011 | 2000 Pontiac Grand Am GT

1 Answer

Just pulled the intake manifold on my BBC and found antifreeze in all of the closed intake valves, what caused that??


Not sure what engine you are speaking of, (other than BBC) but if you did not drain your cooling system before removing the intake manifold, any coolant in the manifold distribution channels would pour out through the easiest path once the gasket seal was broken.

Jan 02, 2011 | 1998 Pontiac Grand Prix

2 Answers

My wife was complaining today about a funny smell coming from her car when she ran her heat. Is there a common reason for this?


Most likely a heater core,that is leaking,check the floor board,and see if there is antifreeze in the carpet.

Oct 23, 2009 | 1997 Pontiac Grand Prix

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

1 Answer

2002 Pontac Grand Prix GTP P0171 code engine stumbling at times


Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.

Mar 29, 2009 | 1998 Pontiac Grand Prix

1 Answer

2003 Pontiac Montana antifreeze smell?


Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.

This is the only real complaint I've had with the van.

Dec 09, 2008 | 2003 Pontiac Montana

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