interior heating -> vacuum line from carb? - Team Camaro Tech
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post #1 of 4 (permalink) Old Apr 22nd, 04, 06:22 AM Thread Starter
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Marc
 
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Hi,

I noticed i don't have heating no more inside the car, and previously it worked with a vacuum source from the carb that was connected to the right of the engine bay, going in the AC box.
Is it possible that heating would be working only with a vacuum source??? i don' tunderstand anything about that, maybe it is best i open and read my CHilton manual.

But any idea??

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post #2 of 4 (permalink) Old Apr 22nd, 04, 08:27 AM
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hmmm , never played with a camaro with factory air, but many other GM cars of that era used vacuam motors to move the flapper valves that direct the air to lower, dash, or defrost ports... hook the vacuam hose back up?





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post #3 of 4 (permalink) Old Apr 23rd, 04, 01:10 AM Thread Starter
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Marc
 
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Hi,

I don't have factory air, and yes i could connect the hose back.
The thing is i wonder if it won't do nothing to the working of the engine if i connect a vacuum hose (for heating -> AC box) to a vacuum source instead of having a plug at this vacuum source.

The thing is i don't know what is inside that AC box and i don't know if the vacuum stays in close curcuit? if this is the case than my question is non sense.

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post #4 of 4 (permalink) Old Apr 23rd, 04, 02:08 AM
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For the most part, vacuum circuits in the Heater/A/C units are deadheaded, providing there is not a leaky selection valve, broken tubing, or a broken vacuum bellows for the function the motor is controlling.

You might put on a hand held vacuum pump onto the hose going into the firewall and listen for a flap to close to make sure it works and does hold vacuum.

But it would seem to me if one has heat wih the vacuum line hooked up, then one would need to leave it connected.

But, it is strange vacuum is needed to get heat. Usually, it 'defaults' to heat, it would need vacuum to get A/C and to route the air flow to feet, dash, or defrost.

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