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markeb01 · 02-04-2010, 02:12 PM

Thanks for the replies. I've never seen a 60 GMC with factory air, so perhaps that is the answer. The Chevy service manual does show a Cool Pack air conditioning system was available, but doesn't show the operating controls. I'm pretty sure the standard heater used the same plate at the deluxe model, but only had two levers instead of four. Thanks again.

02-04-2010, 02:12 PM	#5
markeb01 Senior Enthusiast Join Date: Feb 2007 Location: Spokane Valley, WA Posts: 8,356	Re: Anybody know what these holes are for? Thanks for the replies. I've never seen a 60 GMC with factory air, so perhaps that is the answer. The Chevy service manual does show a Cool Pack air conditioning system was available, but doesn't show the operating controls. I'm pretty sure the standard heater used the same plate at the deluxe model, but only had two levers instead of four. Thanks again.