ac problem - Ford Powerstroke Diesel Forum

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post #1 of 3 Old 10-14-2012, 08:41 AM Thread Starter
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ac problem

need help with my ac, the ac will only blow out of the defrost. Ive checked the vacum lines twice, and when i move the lever on the blinder under the dash by passenger floor board it will blow out of the vents. Also when i move the slector to defrost the compressor is still engaged along when on mix???????? Any help will be great.

Truck is a 92 7.3idi 5SPD with banks turbo,4x4 single cab.

92 obs single cab single wheel 4x4
5spd
6 ich rough country
37 military tires
banks turbo
high idle
triple guages
a lil pump treaking
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post #2 of 3 Old 10-15-2012, 05:11 PM Thread Starter
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well now today it all of a sudden started to blow out of the vents then back to defrost. Also the brake petal is stiff as can be, would this be the vacume pump???????? Someone please chime in

92 obs single cab single wheel 4x4
5spd
6 ich rough country
37 military tires
banks turbo
high idle
triple guages
a lil pump treaking
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post #3 of 3 Old 10-18-2012, 09:52 AM
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Yes this may be the vacumn pump. It could also be as simple as a belt too loose if you have a v-belt system. You should also check your vacumn resivoir, the coffee can on your passenger side fender. If its full of rust holes you'll be losing some vacumn pressure from there. As far as the compressor goes, it is suppossed to engage on defrost, your ac system removes moisture to help keep your windsheild from fogging up.

'85 Frame
'95 Cab bed and front clip
'88 7.3 IDI
'92 ZF 5-speed
'99 Factory exaust
'89 Rear axle
Banks sidewinder turbo
6637 air filter
Isspro boost and pyrometer
Name a part...I've probably modified it
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