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Btoneill's avatar
Btoneill
Explorer
Aug 25, 2018

Dash air on 2000 Ford F53

Having trouble keeping the dash AC operating. Have charged the R-134 after evacuating up to the 2.75 lbs required. Needed to jump the low pressure switch to keep the compressor operating to charge. The clutch will not stay on without the jump.
Had a power surge while holding the jump wire.
Not sure what is wrong or happening. Recently replaced the low pressure switch.
Thoughts?
Thanks

Brian
Class A
  • MountainAir05's avatar
    MountainAir05
    Explorer II
    Aug 26, 2018
    First connect your gauge set on the high and low ports. Engine not running and write down the low and high reading and outside temp.

    Next ohm out the low pressure sensor. write down

    Start engine and write down the the Low and high reading and outside temp. Setting on max air and fan on high. Output temp on the air condition. Engine rpm at 1500 for ten minutes, Post these back.
  • Btoneill's avatar
    Btoneill
    Explorer
    Aug 27, 2018
    Outside temp 80.
    Not running:
    Low = 125
    High = 150

    Running:
    Low= 80
    High= 170

    Infinite reading on Low Pressure Sensor Ohms

    Jumped Sensor readings:
    Low= 30
    High = 250

    Thanks
    Brian
  • phnguyk's avatar
    phnguyk
    Explorer
    Aug 27, 2018
    Google shimming Ford A/C compressor. May be part of the issue

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