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1991 Ford F-150 A/C seems to run when I use defrost

Tiny
SPB077
  • MEMBER
  • 1991 FORD F-150
Air Conditioning problem
1991 Ford F150 6 cyl Four Wheel Drive Manual alot miles

my a/c clicks on and off (blows cold air) when I am just trying to use derost
Saturday, September 19th, 2009 AT 4:35 PM

3 Replies

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
That is normal. When the defrost is activated, the a/c is also activated.
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Sunday, September 20th, 2009 AT 5:03 AM
Tiny
SPB077
  • MEMBER
  • 1 POST
Thanks for reply, I made a donation when I jioned. The a/c should run when above a certain outside temp I found out. But this one turns on all the time, even when it was only about 50 degrees the other morn. Do you know where it gets its temp from so I can replace that. Sensor?
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Sunday, September 20th, 2009 AT 3:39 PM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
The ait sensor will be in the air intake tube. Sometimes it will be behind the grill on the right side, behind or in the intake tube.
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Monday, September 21st, 2009 AT 12:16 AM

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