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Topic: A/C down around the ankles

in Forum: C3 Cooling and Heating Systems


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A/C down around the ankles (1/6)
 6/27/08 8:53am
KeBo
Former Member

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Kendall Park, NJ - USA

Vette(s):
1981 - 59 Beige over Cinnebar leather. Edlebrock top end, 2200 stall w/shift kit, 3:55s, Mufflex maniback exhaust, nice stereo, 16 in AREs w/BFGs


Joined: 3/9/2005
Posts: 789

My A/C blows out thru the floor vents. I suspect something is amiss with the console controls not routing the air thru the correct passages.
 
A) Does my hunch seem correct?
B) Must I pull the center console to fix this?
C) Thoughts?
 
Thanks!  KeBo
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A/C down around the ankles (2/6)
 6/27/08 9:29am
Adams' AppleLifetime 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: 20126

Yes
Yes
No



Prolly have a vacuum line off, possibly in the engine compartment. A more likely cause is gonna be in the control switch(es) in the console. The vacuum switch there can/will dry out over time, and create what amounts to a vacuum leak, so when you move the lever to change the "mode", there is no vacuum to pull the servo and change the door positions.
If you can get in a really quiet area, start it up, close the doors/windows, and listen around the HVAC control in the console for a hissing noise as you move the lever slowly from position to position, stopping in each position for a few seconds to allow the switch to complete the vac. circuit. If you hear a constant hiss, that will be a vacuum leak. You may normally hear a little hiss as the doors change, but a constant hiss is a leak.
You'll prolly wind up changing the control..

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Joel Adams
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A/C down around the ankles (3/6)
 6/27/08 9:35am
KeBo
Former Member

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Kendall Park, NJ - USA

Vette(s):
1981 - 59 Beige over Cinnebar leather. Edlebrock top end, 2200 stall w/shift kit, 3:55s, Mufflex maniback exhaust, nice stereo, 16 in AREs w/BFGs


Joined: 3/9/2005
Posts: 789

Joel - Thanks Bro!
A/C down around the ankles (4/6)
 6/27/08 12:52pm
VetteSpecialties
Former Member

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Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe


Joined: 5/24/2007
Posts: 1031

Another common problem is the diaphragm in the actuators.  There are several on an AC car.  The one that leaks is always the one that is hardest to get to.  On my '68. the bad one required removing the gauge cluster, right side dash, and entire heater box.  Then 30 seconds to change the actuator.

Good luck
Larry
A/C down around the ankles (5/6)
 7/1/08 6:10am
terntes
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Little Rock, AR - USA

Vette(s):
1982 Collector Edition


Joined: 7/10/2007
Posts: 123

My '82 blows air on the ankles, there is ducting there. Maybe your model does not have ducting to the floor.
terntes
A/C down around the ankles (6/6)
 7/1/08 6:13am
terntes
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Little Rock, AR - USA

Vette(s):
1982 Collector Edition


Joined: 7/10/2007
Posts: 123

I was checking the assembly manual regarding the vacuum leak to my defroster and the manual indicated and clearly showed electrical wiring routed over the floor duct labeled AC.
terntes
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