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(1999 Ford F-150)
in Pleasant Prairie, WI on December 11, 2010
when running heater there is a noise like a fan or a compressor running but its runs shuts off contiually ,its not the heater fan because that is continually running at the same time the noise will stop when i turn off the heater ,what is that?
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Popular Answer
on December 11, 2010
The AC compressor will run with the heater on in most settings. The only setting that will not turn the compressor on is the "Floor" setting. Otherwise, the compressor is always working to keep humidity out of the hopefully help clear up windshield moisture, etc.

You are likely hearing the cycling of the compressor.
on December 13, 2010
Thanks that makes sense .
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