Heater hoses off, still hot air from vents
Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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k
I put shutoff valves on both hoses going to the heater, but really hot air is still coming out of the vents when driving down the road. Fan is off, A/C set to off.
Any advice on how I shut this off, its feakin hot here in Texas.
Thanks, Ken
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Duncanville, TX - USA
Joined: 11/8/2003
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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
Oh common, Ken...it ain't HOT here yet!! 
What is prolly happening is air from under the hood is getting into the cowl vents, and blowing into the cabin.
Since you have A/C, it is probably even worse, since you have a large opening on the pass side kick panel, for fresh air, that should have a close-off door. The seal on the door is most likely gone, or deteriorated to the point of not sealing at all, and this allows the hot air to invade the cabin.
Is the A/C hooked up, and working? Even if it doesn't work, you can put the thumbwheel(or slide lever, depending on what year model it is) to "Max A/C", and that will close the fresh-air door, and at least slow down the incoming heat wave.
Another very important thing to check is the rear seal that fits across the rear edge of the hood...if it is missing/damaged, there's nothing to stop the super-heated air from the engine from getting into the cowl vents, and therefore into the cabin.
Also, check to see how many holes in the firewall are not sealed...you'd be surprised at how much air can come thru a seemingly small hole around the speed-o cable, or even the accelerator cable.
hth
btw..what year model car is it?
What is prolly happening is air from under the hood is getting into the cowl vents, and blowing into the cabin.
Since you have A/C, it is probably even worse, since you have a large opening on the pass side kick panel, for fresh air, that should have a close-off door. The seal on the door is most likely gone, or deteriorated to the point of not sealing at all, and this allows the hot air to invade the cabin.
Is the A/C hooked up, and working? Even if it doesn't work, you can put the thumbwheel(or slide lever, depending on what year model it is) to "Max A/C", and that will close the fresh-air door, and at least slow down the incoming heat wave.
Another very important thing to check is the rear seal that fits across the rear edge of the hood...if it is missing/damaged, there's nothing to stop the super-heated air from the engine from getting into the cowl vents, and therefore into the cabin.
Also, check to see how many holes in the firewall are not sealed...you'd be surprised at how much air can come thru a seemingly small hole around the speed-o cable, or even the accelerator cable.
hth
btw..what year model car is it?
Joel Adams
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k
Sorry forgot to mention its a 76.
A/C is working, but low on Freon.
So if i get this right, fan air is supplied from pass side cowl, except when on Max AC, then it sucks from the pass side kick panel?
Thanks, Ken
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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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