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Old 03-03-2008, 08:10 AM
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Not a hot rod ? 07 Grand prix

HI all picked up a 07 grand prix for a new driver,first thing the car still has warranty,but i want to have a idea when i take it back to dealer.Noticed that the coolant overflw bottle was low on dexcool,bought some and added to the coolant fill bottle to the cold fill line,now it seems that the level has drop about a litre of coolant.Is this normal for these new cars and heard some issues about dexcool.Any help and advise is appreaticated.Thanks all.

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Old 03-03-2008, 11:35 AM
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Originally Posted by stoney 81ta
HI all picked up a 07 grand prix for a new driver,first thing the car still has warranty,but i want to have a idea when i take it back to dealer.Noticed that the coolant overflw bottle was low on dexcool,bought some and added to the coolant fill bottle to the cold fill line,now it seems that the level has drop about a litre of coolant.Is this normal for these new cars and heard some issues about dexcool.Any help and advise is appreaticated.Thanks all.
Not normal.

The cooling system puts hot expanded coolant into the catch bottle when the quantity inside the cooling system, due to thermal expansion, forces the relief valve in the pressure cap open. When the engine is shut off and cools the coolant inside the cooling system contracts forming a vacuum which then draws the excess that had been deposited in the overflow tank back into the radiator/cooling system.

If you've added coolant to the overflow tank bringing the level to the cold line. The heated operating engine should have added some quantity to that. This quantity basically just shifts back and forth, being deposited in the tank when hot and drawn back into the cooling system when cold.

If the amount you added is also being drawn into the cooling system when the engine cools, it's an indication that the system either wasn't filled to capacity when new; or the system is leaking/loosing coolant somewhere which is being made up with the cool-down quantity sitting in the catch tank.

Of course some amount in the catch tank is lost to evaporation, but this should be pretty minimal. The catch tank should go for long periods, weeks to months, without needing additional coolant to maintain proper reserve levels.

Dexcool is very sensitive to air in the system, this results in a chemical breakdown of the Dexcool when its hot, making quite a mess in the cooling system. You need to keep a careful eye on this condition to insure that a situation doesn't develop where a total loss of reserve tank coolant quantity would allow the cooling system to suck air into itself rather than Dexcool.

Bogie
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Old 03-03-2008, 03:16 PM
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Quote:
Originally Posted by stoney 81ta
HI all picked up a 07 grand prix for a new driver,first thing the car still has warranty,but i want to have a idea when i take it back to dealer.Noticed that the coolant overflw bottle was low on dexcool,bought some and added to the coolant fill bottle to the cold fill line,now it seems that the level has drop about a litre of coolant.Is this normal for these new cars and heard some issues about dexcool.Any help and advise is appreaticated.Thanks all.
Take a real hard look at the ends of the intake manifolds where they meet the heads. These intakes are very prone to leakage. There are 10MM bolts on the ends of the intake (2 per side) that will usually appear loose when the gasket goes bad. One is real easy to see and the other is a little tough. Look for antifreeze staining near the ends of the manifold. The dealer may want to jut put sealer pellets in, Dont let them do it they are only good for about 15K miles usually, make them change the gaskets.
It is about a 4 Hour job, I have done several, and is made much easier with a special tool that makes it so you dont need to remove the rear valve cover.
If you do this yourself, pay attenetion to where the push rods come from as they are not all the same length and you do need to remove them to replace the gaskets

Chet
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Old 03-04-2008, 01:23 AM
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Thanks for your advise,i will monitor the coolant levels b4 i take it in and also check the intake manifolds for any leaks.
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