hvac selector issues
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Freshman User
Joined: Dec 2011
Posts: 33
Likes: 1
hvac selector issues
so my 93 f150 will only blow on defrost. i can grab the little arm under the dash and can make it go to defrost or vents. if i turn the selector **** to ac the ac will come on but i have to manually move the arm under the dash to either defrost or vent. that's the only 2 selections i can use. i cant find any vacuum leaks or any obvious issues. but i really dont understand the system fully either.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
You either have a vacuum leak or the vacuum line for the system is no longer connected to the intake.
Most of the time this problem is from something under the hood and most of the time it is the white hose for the outside air motor as in the photo below.
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Most of the time this problem is from something under the hood and most of the time it is the white hose for the outside air motor as in the photo below.
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Junior User
Joined: Dec 2011
Posts: 87
Likes: 0
From: Kelowna, B.C
exacty same thing happend to me when i did my tune up.
$20 bucks says your ratchet caught on an old brittle vaccum house. and either cracked or broke it in half.
check all the lines around where you were working. Fix the Vaccum leak and your HVAC will work properly again!
$20 bucks says your ratchet caught on an old brittle vaccum house. and either cracked or broke it in half.
check all the lines around where you were working. Fix the Vaccum leak and your HVAC will work properly again!
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