Question about 1990 Pontiac Grand Prix

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The car is a 1990 pontiac grand prix. it overheats. the radiator does not leaking. the leak is in the back of the motor. the rear freeze plug, maybe? but how can i get to it without pulling the motor?

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Check the rear head, head gasket.I think that this may be your problem. I`ve experienced this before in my shop..
You can also take your car to your repair centre for a visual check. Most shops will charge about $50.00 for this service/inspection..

Posted on Mar 12, 2011

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Posted on Jan 02, 2017

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1991 pontiac grand prix le 3.1l overheating


I had an older vehicle that overheated. I flushed out the radiator twice, but it was so clogged up, I had to replace it, so check the radiator. If you inspect the radiator from the filler neck, you can see if there is crud build-up on the tubes. The problem could be the water pump. Typically when water pumps fail, they start to leak from the weep hole(s) on top and /or bottom. Is there any leak from the pump? If there is, that is indication that the pump need to be replaced. Hope this helps !

Apr 04, 2014 | 1991 Pontiac Grand Prix

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Radiator drain plug leaking


try fitting a flat rubber gasket on the plug before fitting. It is possible the there was one on it but it fell off unnoticed or was cracked and broke off.

Jan 14, 2013 | 2006 Pontiac Grand Prix

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Do you have to lift the motor on a Pontiac grand prix 6 cyl. to get to the back freeze plug that is leaking oil?


if you have a freeze plug leaking oil you've got major problems....freeze plugs or expansion plugs are for engine coolant only, they are there in case the coolant freezes it will pop out one of those plugs before it cracks open the engine block. at least in theory. you should probably start with the valve cover gaskets and then do upper and lower intake gaskets...

Oct 28, 2011 | 2004 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

1 Answer

Hi I have a 1996 grand prix SE 3.1L engine. Its leaking a good amount of coolant, mostly from around the the back of the engine. I look under the car and can see also little driplets along the...


Yes, the pump is on passenger side. But when car is moving, the coolant that leaked can get blown all over, so you need to check carefully. Use rags to wipe off all the coolant you can see, then when more leaks out, maybe you can see where it comes from.
The noise on driver's side might be coolant boiling inside the engine. Be careful it doesn't overheat, or you will be doing the gasket job again.
On the backside of the engine (near the firewall), a couple of possibilities: the heater hoses are there, so check them for leaks. Also on the engine block, about halfway up the block, there are 3 or 4 freeze plugs, spaced evenly along the engine (also on the front side of the engine-the same freeze plugs. Check if any of these are leaking. Use a flashlight and maybe get under the engine to look around-be careful if you have to raise the car-don't trust a jack, but use blocks or jack stands.. The freeze plugs are round metal plugs about 1 1/2 inches in diameter, and pressed into the block. You can see or feel them. They can be punched out and new ones pushed in. But make sure you have one that is leaking before attempting that.
Good luck, Joe.

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3 Answers

My 04 grand prix is leaking coolant. It was first


I had the same problem.The leak was from the block heater.I did not notice any leaks on the ground,but was always low on anti freeze.The block heater came apart on the highway and blew all the fluid out of the car,luckly i shut the car off and had it towed to the shop.They replaced the block heater with a rubber frost plug to get me back on the road.Have your block heater checked,they maybe your problem has well.

Jan 21, 2010 | 2004 Pontiac Grand Prix

1 Answer

1994 pontiac grand prix leaking water


It sounds like either the heater valve which may be located inline with a 5/8" hose or 3/4" hose or the heater core is leaking, a heater core is like a small radiator.

Feb 19, 2009 | 1994 Pontiac Grand Prix

1 Answer

My 04 grand prix is leaking anti freeze


That leak is Coming from the Overflow Tank. This is Where the Coolant goes whenever the Motor gets Hot and it is Boiling. Unless your Car is getting Hot, You do not need to worry about this. It is Normal.Please Rate my Response, I need all the Help That I can Get! Thanks!

Jan 27, 2009 | 2004 Pontiac Grand Prix

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