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I havent been here for a while and ran into a problem you might help with.
I own a 1968 cadillac eldo with ac blowing cold , but blows out the vents only in park or neutral . when in D, or low the system blows out the floor and defrost vents...
could this the the neutral safety switch with a leak....
any brainstorming would be helpful....
thanks in advance
It's a vacuum leak, for sure. Probably on the rear of the control head in the dash, but check the line on the intake.
It probably is a vacuum leak. The system is designed to send vac to the idle speed up diaphragm on the carb in P/N. You might try pinching off the vac line to the P/N switch first. Check any other vac connections that are easily accessable too.
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