Thread: how do i install a vacuum control valve dashpot or idle up
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Old 10-12-2003, 10:01 AM
Mark DiSilvestro Mark DiSilvestro is offline
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Join Date: Jan 2001
Location: Alexandria, Virginia
Posts: 5,480
Of course your dashpot is working opposite of those cars that use one to idle-up for the AC. You have three options.

1. Install a relay to cut power to the vacuum valve when the AC is on. Relay powered off the compressor source. Vacuum valve powered through the ignition switch, via a fuse at the fusebox. This will complicate your AC-related wiring.

2. Find a different vacuum valve that CUTS vacuum when the compressor is on. This would be the easiest fix if you can find the right valve.

3. Modify the dashpot linkage or get a different dashpot, so it idles-up the throttle when the AC is on and vacuum is applied.

A fourth option, one I would have tried, would be to simply adjust the idle up slightly, about 200 RPM, and forget about adding the idle-up device. This option would depend on how much your AC installation drags down your engine's idle speed.

Happy Motoring, Mark
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