New A/C compressor will not build pressure

Tiny
JESSE11JAMES
  • MEMBER
  • 1999 VOLKSWAGEN BEETLE
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 214,000 MILES
I just replaced the A/C compressor and expansion valve and receiver dryer flushed and pulled vacuum and started to refill with r134 and the low and high sides both sit at 45 PSI. Compressor clutch engages and fans turn on but there is no pressure difference between low or high side.
Do you
have the same problem?
Yes
No
Monday, June 14th, 2021 AT 7:16 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If the system held a vacuum and is fully charged, the compressor is likely no good. If you are showing 45 PSI (equalized pressure with the system off for at least 1 hour) and there is no change when the compressor is running, the compressor isn't working. The only other thing I can think of other than a bad compressor is if even though the compressor clutch engages, for some reason it isn't turning the compressor. Do you notice the center of the clutch/pulley assembly turning when it engages?

Also, here is a link you may find of interest:

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

Watch to see if you see the center of the clutch/pulley turning when engaged and stopping when it disengages.

Let me know.

Joe
Was this
answer
helpful?
Yes
No
Monday, June 14th, 2021 AT 9:38 PM
Tiny
JESSE11JAMES
  • MEMBER
Yes, the clutch is engaging. I work on cars a lot but not usually A/C systems and this would be the first time I have had a defective compressor strait out of the box. I'll try to exchange it and see if a new one works.
Was this
answer
helpful?
Yes
No
Tuesday, June 15th, 2021 AT 5:38 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If the pressure doesn't change, something must be wrong with the compressor. If possible, let me know what happens when the compressor gets replaced.

Take care,

Joe
Was this
answer
helpful?
Yes
No
Tuesday, June 15th, 2021 AT 8:42 PM

Please login or register to post a reply.

Sponsored links