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Pyrotechnic · 08-26-2009, 03:39 PM

I think it's a safety deal to keep a constant flow of fresh air coming into the cab.

08-26-2009, 03:39 PM	#5
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: Figuring out my Heater/Ac controls 75 I think it's a safety deal to keep a constant flow of fresh air coming into the cab. __________________ 1977 GMC Sierra Grande