Is the Oil Presure light in the dashboard on? I had the same problem when I turned on the heater or the a/c. I changed the oil pressure switch & the noise stopped. I think it was because ofthe extra load in the engine & the oil pressaure was low to begin with putting on the a/c jus strained the engine & pump more, making the noise.
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Tuesday, August 18th, 2009 AT 5:11 PM