jwillman

I am loosing 150 RPM at idle when I turn on my AC.

How do I test the AC air valve to ensure its working?

Should I see the RPM increase or at least maintain at idle when engaging the AC if that valve is operating or is an RPM lose normal for the older cars?

The Forgotten On

It should rise. Most likely the wire that goes into the AC compressor clutch connection ( both are crimped into the same spade connector) has worn through and broken off.

At least that is what happened to mine. Otherwise check its ground connection and then test it with a battery to see if it works at all.

Hope this helps.

SwedeInSiam

Check that the hoses are connected correctly. Should be one on each side of the Aux Air valve.
Was connected on one side of the Aux Air valve by PO (or mechanic) on my car when I bought it.

SMTCapeCod

Steerike one.....

Steeerike two...

O/P asked about the A/C air valve, not the aux/idle speed valve. This is the little bypass unit mounted to the crossbar.

Edit: @#5/Anders, I see, sorry for the snark. ;-)

SwedeInSiam

And the hoses from the A/C air valve should be routed to one of each side of the Aux air valve to bypass it. Which was wrong on my car when I bought it.

jwillman

Thanks. Mine is plumbed correctly. replaced the wiring with the Roger harness a couple years back but will check for function this weekend.