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A/C Compressor is always on?

Tiny
EYAD ALHERZ
  • MEMBER
  • 2002 GMC SUBURBAN
  • 160,000 MILES
The A/C compressor will start running whenever I turn the A/C on. However, it is not cycling on and off.

I tried removing the low-pressure switch, but the A/C compressor was still engaged.

The strange thing was when the freon leaked this week, the compressor was not engaging at all.
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Thursday, May 11th, 2023 AT 6:20 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If the Freon is low, it can cause it to run at all times. How quickly is it losing Freon? Take a look through this link if it has stopped working.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

If the freon was lost, that is what the low pressure is for. It will prevent the compressor from engaging. Also, try switching the compressor relay with a different one in the box having the same part number and see if that makes a difference.

Let me know.

Joe

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Friday, May 12th, 2023 AT 8:29 PM
Tiny
EYAD ALHERZ
  • MEMBER
  • 2 POSTS
Thank you for replying to me. However, my concern is how possible if the low pressure switch was removed, and the compressor still running?
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Saturday, May 13th, 2023 AT 1:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

That is a good question. Something had to be sending a signal. Is there any evidence of wiring damage?

Joe
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Saturday, May 13th, 2023 AT 10:08 PM

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