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Discussion Starter · #1 ·
My car makes a noise when I have the A/C compressor on defog/heat selected and low fan. The noise sounds like a bad fan motor but it goes away when I turn the A/C compressor off. I think it is possibly freon pressure pulse at the evaporator..anyone else hear the noise? I had a simular problem years ago with a '73 455 Formula, Pontiac installed an accumulator in the high pressure line A/C and corrected the noise problem.
 
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