2003 Ford F150 Does the Air Comp. have to be on for the Def

2003 FORD F-150
149,000 MILES • 6 CYL • 2WD • AUTOMATIC
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GARY BYRUM
  • MEMBER
  • 1 POST
My truck when using the defroster the air comp. kicks in
The only time the comp. is not on is when the knob is at panel , off, and floor. It comes on when it is in
ever other position. Is the right?

Thank you Gary Byrum
Jun 5, 2010 at 7:04 AM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,403 POSTS
Hi Gary Byrum. Welcome to the forum. It is normal for the AC to run in defrost mode. That is done to remove moisture from the air before blowing it onto the cold windshield where it would condense and cause fogging.

caradiodoc
Jun 5, 2010 at 8:08 AM
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