Question about 1995 Oldsmobile Eighty Eight

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Coolant leak i took the plastic plenum off and the top of the manifold is covered in antifreeze

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  • weldjonshar Feb 05, 2009

    my car losees coolant over 2-4 days. There is no "steam" coming from top of engine and no pooling collant when the car is off and sitting still. I changed the thermostat gasket where there was steam emerging and it's gone. I find the radiator coolant level drops and the reservoir empties over 2-4 days. My mechanic said there was no problem with freeze plugs, didn't see where the fluid was going. The water pump is not making noise, and the engine hot light never comes on. Can a pressure test help identify the problem? Clueless & Cool-less

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Had this same problem. The plenum has a coolant port for the EGR valve which lets in a small amount of coolant. The intake plenum is plastic and will leak coolant into the lower manifold. You will need to replace the warped leaking plenum with a new one, flush the engine, Coolant DOES NOT LUBRICATE THE MOTOR!!! CHANgE OIL & FILTER.I did this myself, lots of stuff to remove & replace. Runs like new after replacing the plenum.

Posted on Oct 16, 2008

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1.Stop leak works if you have a pinhole leak in the radiator itself. Your coolant leak is in the engine.
2. The radiator holds the coolant mixture that passes through the engine and back into the radiator. The air that flows past the coils in the radiator reduces the temperature of the coolant. When the coolant passes through the engine, the temperature of the coolant increases. When you lose coolant directly from the engine, you reduce the cooling system efficiency and on a hot summer day, take more of a risk of overheating the engine and causing the pistons to sieze. If this happens, you need a new engine.
3. Anytime you can put less than $1000 to $1500 in repairs into a car in a year, that's a pretty good deal. You can spend well over $350 each month to make a car payment.

Posted on Jun 12, 2008

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If you have the 3.8L V-6 engine, your oil consumption problem is most likely to be caused by the PCV Valve if you cannot find any external leaks. These are also known for the upper intake plenum leaking antifreeze. The ports in the manifold that go to the throttle body are made of very thin plastic. The EGR tube, with its hot exhaust gasses, goes right between them. This causes the plastic to heat up and crack, causing an antifreeze leak that goes directly into the intake and gets burned in the combustion chambers.

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The DORMAN part number for your car is 615-180 Shop around...prices vary considerably.

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1 Answer

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1 Answer

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