Project C4, 85 Corvette

[Steve85]

Does your car have vacuum for the vent doors and shit? That mess of tubes behind the dash intimidated me as well last time I was looking into this. We might have to arrange a Saturday meet up sometime!

It does and it doesn't work perfectly but I have it where I get air from the main dash vents and from the defrost so the heat, AC and defrost all function. At least as well as any 35 year old vacuum system can be expected without a total overhaul. I need to reinstall my vacuum storage ball and see if I can get things moving like they are supposed to.

One of the things I learned on these older systems is that they are really very simple. The head unit controls all the blend doors with vacuum but that is all separate from the very simple control of the compressor clutch. Even if the vacuum lines that control the blend doors are complete toast, the compressor only cares whether the slider is one of the AC positions. If so, it gets 12v when the pressure switches say so and it makes cold air.

Yeah, I'd be happy to meet up sometime!