Question about 2001 Oldsmobile Aurora

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I paid for a radiator, water pump, thermostat, and heater core to be put on my 2001 aurora and the engine is still bubbling I got an engine block test done and it was okay. Three Mechanics have tryed to diagnose the problem and I have not had any luck. Without theThermostat the engine is subsided

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Does your cooling system hold pressure when it is hot? Is there the chance that either your surge tank or radiator cap is defective? It has to hold pressure when hot to function properly, and without a thermostat you will have issues with the car operating in open loop, causing damage to the engine and catalytic converter, not to mention possibly not getting heat in cold weather. You are aware that these engines (called 'shortstars') have issues with head gaskets-was it recently overheated. and is that why all this work was done? I have a 2001 Aurora with a 4.0, you have to watch the coolant level like a hawk on these engines (and on the 3.5, a sawed-off 4.0, I have one of them too, a 2000 Intrigue). If you are getting air pumped into the surge tank, you have a head gasket issue, or a cracked/warped head)-check your fluid level when the engine is cold, like after it sat overnight-fill it SLIGHTLY above the full cold mark, and start it, let it run with the coolant cap off until it gets to normal operation temp (half way up)-you may have a hard time getting it hot enough though, without the thermostat. Once at full operating temp. make certain the level is again SLIGHTLY above the full mark on the surge tank. If you are getting bubbles at this point, your block is not the issue, but the all too common head gasket(s) are-good luck, and if you get new head gaskets done, make certain you are using new bolts for the heads.

Posted on Mar 21, 2011


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