The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Heater off But Heat Sneaking Through Bottom Vent.. Lil help.

Liberty · 05-20-2015, 02:51 PM

Some of our early squarebody trucks had factory vac controlled heat lines that cutoff heat flow when the A/C ran. I saw one in the shop the other day that had this setup.

05-20-2015, 02:51 PM	#16
Liberty Registered User Join Date: Feb 2015 Location: Bonham, Texas Posts: 241	Re: Heater off But Heat Sneaking Through Bottom Vent.. Lil help. Some of our early squarebody trucks had factory vac controlled heat lines that cutoff heat flow when the A/C ran. I saw one in the shop the other day that had this setup.