A/C only blows out of defrost
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Joined: Mar 2007
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From: San Leon, TX
Car: 91 RS and 88 IROC-Z
Engine: 305 TBI and 383 Carb
Transmission: 700R4/2200 stall & 700R4/3500 stall
Axle/Gears: 3.42 posi and 4.11 posi
A/C only blows out of defrost
Anyone know why my ac only blows out of defrost. When I put it on norm ac and max ac it comes out the dash defrost only and not the vents.
Joined: Aug 1999
Posts: 19,282
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: A/C only blows out of defrost
JamesC
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Joined: Jun 2003
Posts: 749
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From: Acworth/Marietta, GA
Car: 88 IROC
Engine: 350 TPI
Transmission: Pro 5.0 shifted T56
Axle/Gears: 10 bolt 3.73 posi
Re: A/C only blows out of defrost
mine did that too. you have a vaccum problem or dirty controls. put your car in low gear, drive it up to about 4000rpm and back off the gas while you wiggle the switch back and forth. this will create a lot of vaccum that could break loose a sticky valve in your HVAC system. thats what fixed mine, never been a problem since...
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