Car Questions
RepairPal is your advocate for car care advice and guidance


(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?
Displaying 1 answer & 1 comment
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.
Sign in to reply
on December 13, 2010
Thanks that makes sense .
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
When i turn on the heater fan, i get a loud noise like the fan is out of wack.
Temperture gauge went to h. i pulled over, put car in n and turned heater all the way up. then went to the read out o...
Didn't find what you were looking for?