2001 Expedition ,AC stopped working

Discussion in 'Explorers - Expeditions - Excursions - Broncos -Es' started by 1935 Ford, Jun 1, 2019.

  1. 1935 Ford

    1935 Ford Junior Member

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    The a AC quit ,it has power at the fuse box but nothing at the low pressure switch . Replaced fuses and still no power at the pressure switch ,any ideas of what i need to look for ?
     
  2. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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    @1935 Ford

    Say the clutch on the AC isn't engaging?

    Even at very low freon pressure the clutch will cycle quickly.

    Haven't seen many times the low pressure switch go bad but it is possible.
    Try jumping the contacts on the connector of the low pressure switch.

    Is a Test meter showing power at the clutch
    power lead ? If you are getting power there, clutch is bad
    or electrical connection needs repair.

    You can run a 15 amp fused test jumper wire into the green wire
    at the clutch to check clutch operation if you believe there is
    a fault in the AC system wiring.

    Check the AC clutch relay.

     
  3. 1935 Ford

    1935 Ford Junior Member

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    I havnt tested the clutch other than it isnt magnatised when the AC is on ,the low pressure switch wires has no power to either side but the fuse does in the fuse block for the clutch . Does power go to the low pressure switch before the clutch or the clutch first ?
     
  4. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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  5. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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    @1935 Ford

    The low pressure switch is a continuity type switch.
    It may be a grounding type latching switch with no power on it.

    When the pressure switch engages, it completes the ground for the
    AC relay trigger's ground side.
    The reason it has two black wires at the connection for the low
    pressure switch.

    Try jumping the contacts on the connector side with a short piece of wire.
    If the clutch comes on this will tell you the pressure switch is bad.
    If not, keep looking at other electrical parts like the relay.
     
  6. 1935 Ford

    1935 Ford Junior Member

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    The switch wires are hot one side on my 2000 f150 ,this one is dead ,finally got the connector off the clutch ,that was a sob. No power to the clutch either
     
  7. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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    @1935 Ford
    How about the relay?

    You can swap another out from some non essential location just
    for testing purposes.

    With the 15 amp AC fuse out are you getting power there ?
     
  8. 1935 Ford

    1935 Ford Junior Member

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    Yes ,power at the fuse 15 amp blue. Changed the relay and the diode and still dead ,could the dash switch be bad?
     
  9. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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    Anything is possible at this point,
    you have gone over nearly everything under hood.
     
  10. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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    Only thing not checked are continuity tests on the wiring themselves,
    from clutch to relay and pressure switch to relay.
     
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