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When I slide the heat control from heat to defrost I'm getting no air out of the defrost, all still comming out the floor ports. I don't even hear any audiable change. All the ductwork is connected , no blockage. Is this totaly vacuum opperated? Or mechanical? What should I check first?
Thanks
Mel
Lifetime Member #90 
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22737
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Mel, I'm not sure on your car, but I think the "Mode" door is vac. operated. It could be a cable, tho. 
('77 was when they changed the A/C-Heat controls/console.)
Hopefully some one will have that answer.
Don't you have the factory service manual?
('77 was when they changed the A/C-Heat controls/console.)
Hopefully some one will have that answer.
Don't you have the factory service manual?
Joel Adams
C3VR Lifetime Member #56 
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(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Joel,
No factory service manual
, have a Haynes service manual but it leaves out a lot of details.
, have a Haynes service manual but it leaves out a lot of details. Thanks,
Mel
Lifetime Member #90
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Lifetime Member
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22737
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Mel, HERE's a h e l l of a deal on the factory manual! Check it out while waiting on someone here to respond!
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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