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Join Date: Jan 2020
Location: Tampa
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Heat exchanger causing intermix?

Purchased 1999 996 with oil in the coolant / intermix issue and lots of white smoke out the exhaust. I RR AOS along with several coolant flushes and a couple of oil changes. No more white smoke and the car runs great. But I’m still seeing Mayo in the coolant. I Flushed a few more times. Then drained the oil without refilling it again I left the car over a few days with water in the coolant lines and no oil in the engine. Removed the oil plug and water came out of the engine.

Can the culprit be the heat exchanger? Or are cracks in the heads causing water to seap through?

Reason I’m refusing to accept cracked heads is how well the car runs and drives after replacing the AOS....

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Old 04-02-2021, 03:02 AM
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A car with a cracked head can run just fine. The oil cooler can be removed and pressure tested.

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Old 04-02-2021, 06:52 AM
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