The idle is supposed to increase when the A/C is on. There is a wire from the A/C compressor clutch over to the idle control unit so the idle control unit will know to increase the idle speed so the A/C doesn't stall the engine. I don't know what the idle speed rpm increase is supposed to be but maybe someone else does. That year should have the later trinary pressure switch and this could be giving a false indication of a need for medium fan speed. Or maybe someone could have fooled with the wiring to make it do this? Mark Dan N wrote: > hi all, > > 1990' Carat - recently purchased - rebuilt engine - smooth idle 950 RPM - > A/C recently serviced, cold air, new fan switch. > > When I turn the A/C on the idle jumps to 2000 RPM - the fan goes to medium > speed all the time. > > What part or parts that triggers the idle? > > What part or parts that triggers the fan? > > please help - I search in the archive and only found an April 2000 article > about this.. > > many thanks in advance > > dan > |
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