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A/C Switch

Discussion in 'Heat & AC' started by Read, Jun 10, 2019.

  1. Read

    Read Junior Member

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    I recently purchased 85 c10 and there is a toggle switch below the driver side dash that was added. I followed the wires and they run to a/c compressor and wiring to evap case. Any idea why this was added? Possibly an a/c switch went bad. I flip switch with fan running and a/c compressor kicks on.

    I assume that I have to toggle switch off if I want to run the heat??
     
  2. 1987 GMC Jimmy

    1987 GMC Jimmy Automobile Hoarder

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    It sounds like a crappy way to bypass the low pressure cutout switch.
     
  3. yevgenievich

    yevgenievich Full Access Member

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    Might be just stock controls failed. Essentially same if it is running through the low pressure switch
     
  4. 75gmck25

    75gmck25 Full Access Member

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    The other possibility is some type of bypass or manual on switch for the A/C compressor on/off. The compressor comes on in Defrost, A/C and usually a couple other positions whenever the fan is on. If they wanted manual control of the A/C they may have added a switch. For example, sometimes folks don't want the A/C on when its defrost.

    Bruce
     
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  5. Read

    Read Junior Member

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    Anything I should be concerned with? Is it ok to leave as is?
     
  6. Crispy

    Crispy Full Access Member

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    I wouldn't be worried unless you want it to operate like stock. Just check for a sturdy connection.
     
  7. Snoots

    Snoots Supporting Member Supporting Member

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    When you want to romp on it but not have to go thru the whole a/c control thing. Kill the compressor.
     

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