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Discussion Starter · #3 ·
Heater hose control valve should close in a/c mode. It is a vacuum operatied valve. The valve closes when I disconnect and plug the vacuum line at the valve and the a/c works great. It appears there should be an electrical signal from the temp lever on the dash control panel, to a vacuum actuator. There are no vacuum lines to the dash control panel. Should be fairly simple to trouble shoot if I had a schematic.
 
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