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Hot air coming through center and side vents

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Old 09-15-2018, 10:26 AM
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platinummaker
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Default Hot air coming through center and side vents

As the title says, hot air coming through center and side ac vents. Car is a 72 with factory air that appears to function properly with a minimal amount of air flow however.
I currenly have top and front dash pads out, where/ what should I be looking for. Have been a car guy for a lotta years and worked on old Jags, but will admit to some intimidating looking work ahead of me. Thanks for all your help.
Additionally, any recommendations on replacement of any components living back behind the dash as I know I wonít want to revisit any time soon!
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Old 09-15-2018, 10:59 AM
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lars
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Hot air leaking through the vents is usually caused by old, deteriorated seals in the heater box. Complete rebuild/seal kits are available to fix that, but the entire heater box should be removed to do the rebuild work.

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Old 09-15-2018, 12:18 PM
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sambrand
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check the vacuum valve that controls the hot water entering the heater core
https://www.corvettemods.com/C3-Corv...BoCbD0QAvD_BwE
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Old 09-15-2018, 12:22 PM
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platinummaker
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Thanks Lars. Is this a job done from inside or outside or both? In lieu of this, would disconnecting heater hose eliminate hot water going to heater core just allowing for ambient air sneaking into the cabin?
Many thanks
Dave
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Old 09-15-2018, 12:32 PM
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sambrand
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Originally Posted by platinummaker View Post
Thanks Lars. Is this a job done from inside or outside or both? In lieu of this, would disconnecting heater hose eliminate hot water going to heater core just allowing for ambient air sneaking into the cabin?
Many thanks
Dave
lars is the guru we all love, and for air leakage he is correct, but unless your getting air in center when u are on defrost as your post seems to indicate If u meant the temp wont blow cool then its the valve mounted on the fender, can be as simple as the vaccum tube got knocked loose when poking around the bay..
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Old 09-15-2018, 01:15 PM
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Thanks sambrand. I can see Iíll be facing a steep learning curve. Appreciate all the help. I get cold ac air from the center and side vents with ac on. However with system totally off I am getting warm air through the vents. Help Mr Wizard
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