Question about 1992 Oldsmobile Cutlass Supreme

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Loosing coolant no obvios leak

Could be leaking from lower intake & boiling off? what to do? thanks

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Yes it is possible, if you oil is not milky or no other leaks can be seen. have the cooling system pressure test completed. Most small shops will only charge 10-20 bucks and this should find the leak

Posted on Nov 29, 2008

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Ok. guys. i am losing coolant. it is not showing up in the oil and i have no external leaks. i did replace the head gasket and all associated gaskets about two months ago. also have changed the upper and...


If the coolant is leaking at the head gasket or the intake manifold gasket slowly, then new gaskets will have to be installed. The bubbles coming up is a bad sign that the seal of the coolant system is bad or it's overheating the coolant to the point that it boils over.

The overheating may be due to air or vapor in the cooling system not allowing fluid to flow freely.

Did you put a 50/50 concentration of coolant to water into the cooling system?

Also, check the fan to see if it is turning on when the car is at operating temperature at idle.

May need to be flushed out and new coolant installed to increase cooling efficiency.

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you need to figure out where the coolant is leaking from. Some common areas are

the water pump in which case you would be able to remove the splash shield from under the front of the vehicle and using a flash light be able to see coolant coming out of the weep hole of the water pump.

The intake gaskets. Look in the corner of the intake valley where the head and lower intake meet right under the a/c compressor. If you see coolant its leaking and needs to be replaced.

The radiator, you'll be looking for wet spots on the side tanks of the radiator. Loose upper and lower radiator hoses could also cause this.

If you can't find anything visually you'll need to bring it in and have it pressure tested.

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If your car is loosing coolant, there might be an exterior leak, or an interior leak. First check and make sure that radiator cap is tight and the rubber sealer is intact, there can be many other reasons ...hole in the coolant hose, leaking radiator, heater core, water pump, intake manifold and more... Check and see if there is any puddle of coolant on the ground, if so you can find where the coolant is coming from.
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