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#1
09-16-2006, 01:52 PM
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AC goes into defrost mode when accelerating
It's been a while since I've been in here, so hope everyone is well. I've noticed that when I have the HVAC blower on and set to blow through the dashboard registers, then push the throttle down to accelerate (up a hill or away from a stop), the blower door will divert the airflow to the windshield. This says to me that I'm losing vacuum when I accelerate but don't know where to look. I just replaced all the vacuum lines abt 6 months ago due to tranny fluid contamination, so normal wear shouldn't be the reason. Any thoughts or experience in dealing with this? Thanks in advance for your help!
Added 9/18/06: This only happens when it is in blower mode. When the air conditioner is on, it blows normally no matter what I do to the throttle. Any ideas?
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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat. Last edited by jdmccright; 09-18-2006 at 12:14 PM. 
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#2
09-22-2006, 03:49 PM
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Re: AC goes into defrost mode when accelerating
I had a similar problem with my 97 Jimmy. Into the dealer and they replaced the HVAC switch in the dash. It worked for awhile and quit again. Dealer eventually changed the defective switch and it is working again.
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