Heater A/C Problem - center vent blows warm when side vents cold and no defog air - The 1947 - Present Chevrolet & GMC Truck Message Board Network

calgary72 · 05-31-2010, 01:34 AM

The A/C works on the truck and blows cold from the side vents but the center vents has some warm air flowing. Also, there is no air flow to the defog when I move the lever there. There is obviously a problem with the the flapper valves - any idea how to fix?

thanks

calgary72 · 06-09-2010, 12:01 AM

Any help out there?

JimKshortstep4x4 · 06-09-2010, 05:42 AM

It sounds like the diverter box flpper door is not moving when you move the levers. Here is a pic of the box that is usually the problem. (Box that is on the floor with the cable running to it).

Jim

trucks72 · 06-09-2010, 07:49 AM

if you have cold air out the sides you should have the same air out the center. They come out in almost the same spot of the diverter box. There is no way heat could go into just the center vent and not the sides. Do you know where the hoses are run to?

calgary72 · 06-16-2010, 01:29 AM

Quote:

Originally Posted by JimKshortstep4x4

It sounds like the diverter box flpper door is not moving when you move the levers. Here is a pic of the box that is usually the problem. (Box that is on the floor with the cable running to it).

Jim

Thanks. I will take it apart.

I think I was imagining it when I said it blew cold on the sides - but that is a separate problem.

05-31-2010, 01:34 AM	#1
calgary72 Registered User Join Date: Apr 2010 Location: Calgary, Alberta Posts: 33	Heater A/C Problem - center vent blows warm when side vents cold and no defog air The A/C works on the truck and blows cold from the side vents but the center vents has some warm air flowing. Also, there is no air flow to the defog when I move the lever there. There is obviously a problem with the the flapper valves - any idea how to fix? thanks

06-09-2010, 12:01 AM	#2
calgary72 Registered User Join Date: Apr 2010 Location: Calgary, Alberta Posts: 33	Re: Heater A/C Problem - center vent blows warm when side vents cold and no defog air Any help out there?

06-09-2010, 05:42 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Heater A/C Problem - center vent blows warm when side vents cold and no defog air It sounds like the diverter box flpper door is not moving when you move the levers. Here is a pic of the box that is usually the problem. (Box that is on the floor with the cable running to it). Jim Attached Images __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

06-09-2010, 07:49 AM	#4
trucks72 trucks72 Join Date: Jul 2002 Location: Crossville Posts: 315	Re: Heater A/C Problem - center vent blows warm when side vents cold and no defog air if you have cold air out the sides you should have the same air out the center. They come out in almost the same spot of the diverter box. There is no way heat could go into just the center vent and not the sides. Do you know where the hoses are run to?



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