The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

MylilBowTie · 11-05-2008, 02:46 AM

I don't think there is a need to remove the heater box. Look under the hood around were the heater core is. There should be a plastic vacuum line that control the door flaps in the heater box. It probably got brittle and broke or came off its vacuum source.

My 86 doesn't have A/C so it all mechanical.

11-05-2008, 02:46 AM	#2
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: 85 Heater issues I don't think there is a need to remove the heater box. Look under the hood around were the heater core is. There should be a plastic vacuum line that control the door flaps in the heater box. It probably got brittle and broke or came off its vacuum source. My 86 doesn't have A/C so it all mechanical. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI