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Search Auto Parts Search 96 jimmy a/c control Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum crazi New User Sep 8, 2007, 3:36 PM Post #1 of 4 (2244 views) 96 jimmy a/c control Sign In I have a 1996 gmc jimmy and my heater and a/c will not switch over totally from defrost to any of the dash vents when you switch the selector dial to them.I checked the vacuum from the engine to the vacuum reservoir and out to the heater/a/c control valve and all is fine.I have vacuum at the control valve/selector, but it does not switch when you turn knob. Is the vacuum control valve behind the a/c and heater controls bad? Tom Greenleaf Ultimate Carjunky / Moderator Sep 9, 2007, 3:12 AM Post #2 of 4 (2236 views) Re: 96 jimmy a/c control Sign In As you know - default is defrost mode. If vacuum makes it to control head is still has to be sent on to diverter doors. Anywhere it can't do that is the fault. I'd think you could hear it leak but if control head just can't route the request it might not make a noise, T crazi New User Sep 10, 2007, 9:36 AM Post #3 of 4 (2232 views) Re: 96 jimmy a/c control Sign In so I guess I will try replacing the vacuum control valve.Maybe the valve is not diverting the vacuum to the other selections on control knob.Could that be the problem?Thank you for your thoughts and help. Tom Greenleaf Ultimate Carjunky / Moderator Sep 11, 2007, 4:34 AM Post #4 of 4 (2229 views) Re: 96 jimmy a/c control Sign In The control head is a tough job to replace. It would be nice to get to the air box and check for vacuum making it to the doors and see if it makes it there. Some can be actuated by hand so you know which ones do what. Watch out for anything to do with air bags! I think most vehicles use a solid yellow wire so don't mess with them, T   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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