Defrost/Heater Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC_Aaron · 01-30-2003, 02:42 AM

Sometimes when I set the defrost controls, the air comes out as if I had the heater on. I'll try to move the controls back and fourth to see if I can jar something loose as if something was stuck, but I don't have any luck. Maybe something's stuck? I'll then stop and let it be and come out the next day to go to work and I'll set the defrost and it will work! What gives here? I haven't begun to try and correct this. I'm thinking a valve is stuck in the unit. Where do I start to try and fix this?

01-30-2003, 02:42 AM	#1
GMC_Aaron Registered User Join Date: Jul 2002 Location: Ventura, Ca. Posts: 87	Defrost/Heater Help Sometimes when I set the defrost controls, the air comes out as if I had the heater on. I'll try to move the controls back and fourth to see if I can jar something loose as if something was stuck, but I don't have any luck. Maybe something's stuck? I'll then stop and let it be and come out the next day to go to work and I'll set the defrost and it will work! What gives here? I haven't begun to try and correct this. I'm thinking a valve is stuck in the unit. Where do I start to try and fix this? __________________ Aaron Ventura, Ca. 1972 GMC Super Custom SB350/TH400



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