air conditioning problem? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ricks1971** · 07-18-2006, 08:39 PM

I charged up my 72 air system. It works great but I tried the heater to make sure it worked as well but the heat comes out the air cond vents. I think something might be wrong. Any one have this problem? Thanks Rick

cdowns · 07-18-2006, 09:08 PM

the vents are both heat and air condutioning vents/most people don't think it's a problem

71Shortbed · 07-18-2006, 09:46 PM

Your outlet door is jammed or not adjusted properly. When you move the "outlet" control lever to the right you should get air at the floor only (heat). Move it to the left you get dash air (A/C). The outlet door control is visible on the front of the heater box above the transmission hump. Take the cable off it, move it both ways with the blower running and see if it works. If it does, adjust your cable, if not, you need a new door.

**Ricks1971** · 07-19-2006, 12:02 AM

thanks

**GMCPaul** · 07-20-2006, 01:35 AM

The A/C diverter box flap door breaks down on its metal shaft it pivots on over time and starts spinning on its shaft when you move lever to block off the A/C vents, if you remove diverter box and drill a few small holes in plastic at shaft and place epoxy in them it will rebond flap door to the shaft again so that it functions properly.
GMCPaul

mrein3 · 07-20-2006, 07:37 AM

I cut a little metal flap of sheet metal, tacked that to the shaft, and pop riveted the plastic door to the metal flap.

07-18-2006, 08:39 PM	#1
Ricks1971 Senior Member Join Date: Mar 2006 Location: Clarkrange Tennessee Posts: 1,787	air conditioning problem? I charged up my 72 air system. It works great but I tried the heater to make sure it worked as well but the heat comes out the air cond vents. I think something might be wrong. Any one have this problem? Thanks Rick

07-18-2006, 09:08 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: air conditioning problem? the vents are both heat and air condutioning vents/most people don't think it's a problem __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

07-18-2006, 09:46 PM	#3
71Shortbed Registered User Join Date: Jul 2004 Location: Lilburn, GA Posts: 209	Re: air conditioning problem? Your outlet door is jammed or not adjusted properly. When you move the "outlet" control lever to the right you should get air at the floor only (heat). Move it to the left you get dash air (A/C). The outlet door control is visible on the front of the heater box above the transmission hump. Take the cable off it, move it both ways with the blower running and see if it works. If it does, adjust your cable, if not, you need a new door.

07-19-2006, 12:02 AM	#4
Ricks1971 Senior Member Join Date: Mar 2006 Location: Clarkrange Tennessee Posts: 1,787	Re: air conditioning problem? thanks

07-20-2006, 01:35 AM	#5
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,721	Re: air conditioning problem? The A/C diverter box flap door breaks down on its metal shaft it pivots on over time and starts spinning on its shaft when you move lever to block off the A/C vents, if you remove diverter box and drill a few small holes in plastic at shaft and place epoxy in them it will rebond flap door to the shaft again so that it functions properly. GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

07-20-2006, 07:37 AM	#6
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	Re: air conditioning problem? I cut a little metal flap of sheet metal, tacked that to the shaft, and pop riveted the plastic door to the metal flap. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN



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