Quote:
Originally Posted by thebmw
Another poster on another forum seems to have hit it dead on. It is an air bubble in the heat exchanger. Probably would exist with the heat or A/C. I turned the fan off and the sound disappeared. That annoying noise has been going on for 4 months. Dealer said it was an intercooler...wrong.
Solution: drain/bleed the fan/heating/cooling circuit. Does anyone know how that is done?
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I believe that is called the heater core
