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09-29-2002, 02:17 PM | #1 |
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Join Date: Mar 2002
Location: KC, NW Missouri
Posts: 144
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Cowl inlet valve on A/C trucks
I recently replaced the cowl (plenum) air inlet valve in my 71. It fits good and closes nicely, but will not open on its own. Removed vacuum line from diaphragm, but had no affect. Is the diaphragm return spring weak? Is there an external return spring missing? This is the first time I've dealt with this setup, looking for ideas.
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09-29-2002, 05:25 PM | #2 |
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Location: Bradenton, FL
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I think it opens WITH vacume.
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1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters |
09-29-2002, 06:05 PM | #3 |
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Location: North Carolina
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closes with vacuum--opens with an external spring mounted on the cowl--look for a small spring hole in the cowl louvers.
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Stepsides look like real trucks! Smitty |
09-30-2002, 12:06 PM | #4 |
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Location: Bradenton, FL
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Thats it closed with vacume. Sorry
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1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters |
09-30-2002, 08:39 PM | #5 |
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Location: KC, NW Missouri
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Thanks, gents. I think I see how this system operates. Now got to make it functional!
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