Just put the AC/heater back in my 70' and am trying to make sure everything is operating properly with the vacuum routes.

When I put the lever on "vent",the vent doors do not open up. I've checked the vacuum cans and they work. The funny thing is when I put the lever in the off position, then the vents open up. I think I have the hoses right (orange).

What is the difference between Defog and De-ice?? The flapper in the heater box doesn't seems to be in the same position for both functions.

Thanks again, it will be getting cold soon and I need to stay warm!

My A/C head unit was FUBAR. I know have a series of Tees that I have to manually pull and plug to get air where I want it. http://www.chevelles.com/forum/smile.gif

My thoughts:
de-ice: uses recycled air from the kick panel

De-fog: uses fresh air from the cowl.

Mine is a 72, I can't say if the colors stayed the same. Some one on here said they had a diagram of all the hose routings. I never got it from them though. http://www.chevelles.com/forum/frown.gif let me know if you turn it up! http://www.chevelles.com/forum/smile.gif

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71' 3880# with me. Big Block 402, Merlin oval heads, 10.2:1CR, TH400, 3.73 posi,
1/8th: 8.0 @ 88mph
BEST 1/4: 12.5 with 1.89 sixty foot (street tires)
BEST MPH: 108mph

Picture of me roasting the tires and other guy stuff (http://www.auburnextremeracing.com/drivers/mike/)
Video of me staging (smoke of course) (http://www.auburn.edu/~ledfojw/vids/mike_chevelle_burnout.avi)

I think de-ice uses only heat. De-fog not only uses the heat but also kicks in the A/C compressor(above 35-40 degrees) which aids in the de-fogging process.

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-Mark
TC# 717
ACES #1641
1967 Chevelle SS396/375 (http://www.chevelles.com/showroom/1BadRat2)
1967 RailVelle (http://www.chevelles.com/showroom/1badrat3.jpg)(Parting out)
1964 Chevelle 283/195
1975 Corvette 396/425 (http://www.chevelles.com/showroom/1BadRat1.jpg)
Rat Garage (http://www.chevelles.com/showroom/RatGarage.jpg)