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10/7/08 7:30pm - Original Message: 'AC Problem Cont.'
shanes79
Former Member
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Tacoma, WA - USA

Vette(s):
1979 L48 Resto-Mod. ZZ383 w/ TKO-500 manual transmission. Centerforce clutch. Tail light conversion. A/C. BeCool radiator. Red exterior with custom black and white leather interior by Mid America Motorworks.

Joined: 10/30/2007
Posts: 85
I just refurbished the AC controls...wiring harnesses...and checked my compressor.  The AC system is working now...with one small problem..

When you have the AC selector in MAX or NORM...the cold air is being blown out into the footwells instead of the dash vents.  If you move the selector to DEF, the system works and starts to blow the air up at the windshield.

Is there a vacuum relay somewhere that could be causing my problem? All of the vacuum diagrams and posts I have been able to find on the topic deal with the more important issue of the headlights.

Any pointers would be appreciated.
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10/7/08 10:30pm - Reply: 'AC Problem Cont.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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

Joined: 11/8/2003
Posts: 19447
Shane, the only place I've ever seen HVAC vacuum diagrams is in the AIM(Assembly Instruction Manual)...if you do not have one of these manuals, you really need to get one. They're only about $20 from any of the Corvette parts vendors....every Corvette owner should have one.

It sounds like you have a vacuum problem, for sure. It could be one of the servos leaking, or stuck, or it might also be simply a leak in the system, or one of the vac. lines off, or in the wrong location.
Someone here posted a pic(or pics) of their car with the dash out, and all of the HVAC stuff out in the open, giving a great view of where everything is, such as the servos for the doors in the HVAC system. It was a couple of years ago, if I remember right, so it might take a little time searching for it, but I shall look and see can I find it...

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Joel Adams
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10/7/08 10:47pm - Reply: 'AC Problem Cont.'
rraider1
Former Member
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Hope these help
 
 
 
 


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Bob R
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10/7/08 10:56pm - Reply: 'AC Problem Cont.'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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

Joined: 11/8/2003
Posts: 19447
Thanx, Robert! That first one is really nice!
The second one is from the AIM, of course...too bad it's not colored in!!

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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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10/8/08 11:31pm - Reply: 'AC Problem Cont.'
acplus
Former Member
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, - Canada

Vette(s):
1972, 1980

Joined: 6/23/2008
Posts: 558

With the engine running and AC on pull the vacumm line off the top part of the servo closest to the gas pedal is there vacumm?

From that servo is a rod that goes toward the center of the dash if you move this arm (with the hose still off) does the air flow to the diferent spots?


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1972 CORVETTE CONVERTIBLE BRYAR BLUE
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 Forums -> C3 Cooling and Heating Systems
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