Thread: AC compressor will not come on.
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Old 06-13-2012, 04:32 PM
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pecanflyboy
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AC compressor will not come on.
I've read a lot about this issue, but can't figure it out.

2003 F150 SuperCrew 5.4L, 4X2
Air Conditioning worked perfectly last night. Nice and cold.

This morning, no worky. AC compressor clutch is not engaging.

Here is what I've done, engine running, Max AC, clutch will not engage compressor:
  • Jumpered low pressure line switch
  • Jumpered high pressure line switch
  • Wiggled switch on compressor (could not get it to release, because I couldn't figure it out)
  • Clutch will turn by hand, engine running and not
  • Attempted to service low pressure port, but since the compressor was not running, the pressure at this port was 80+ PSI.
  • Checked AC clutch relay, AC Fuse, and AC diode
Because it ran so well just 12 hours ago, I feel like it something electrical.

Any ideas?

Thanks,
Jimmy
 
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