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high idle W/ AC on

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Jonny-K5, Sep 13, 2005.

  1. Jonny-K5

    Jonny-K5 1/2 ton status

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    what controls the high idle function when you turn the AC on. my 89 blazer stopped doing this a few months ago. not sure if its a sensor, the computer or what?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Have to look at the wiring diagrams to be certain, but on most of GM's EFI setups, there is a pressure switch in one of the AC lines that the ECM monitors.
     

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