A/C compressor clutch not engaging?

170,131 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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TWIN TWIN
  • MEMBER
  • 3 POSTS
my compressor (new) won't stay on it will only engage with the A/C relay being jumped at the box. It has new A/C lines, condenser, and all switches new except the high pressure one at the compressor. I vacuumed before installing all parts. was able to get freon into system with relay jumped at the relay box and it got cold. I can make a video later it is late now, but I can if needed.
May 16, 2025 at 4:54 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,594 POSTS
Yes, a video will help, it takes time to upload FYI. Can you tell me what the low side pressure is with the system off? It needs to be about 55 PSI, or the system will not turn on.

Please go over this video to help:

https://www.youtube.com/watch?v=4EqdrBVb0sY

Please go over this guide and get back to us.
May 18, 2025 at 11:36 AM
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