No coolant pressure, A/C not blowing cold air

Tiny
THECAPTAIN41
  • MEMBER
  • 2000 MERCEDES BENZ E320
  • V6
  • 2WD
  • AUTOMATIC
  • 67,000 MILES
A/C won't blow cold. I need to over-ride the A/C relay control to troubleshoot and/or add Freon. How do I do that?
Wednesday, May 29th, 2019 AT 8:22 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Welcome to 2CarPros.

Have you checked static pressure? If it is too low, it won;t engage the compressor. If you want to engage the compressor, you can run power directly to it. However, I would recommend getting pressure readings first and then go from that point. If the Freon is low, then adding Freon will increase the systems pressure and it will engage on its own.

Let me know.

Joe
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Wednesday, May 29th, 2019 AT 7:13 PM

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