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A/C low side pulls into vacuum

Tiny
INTEX
  • MEMBER
  • 2012 MAZDA 3
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 60,000 MILES
A/C compressor goes on and low side goes into vacuum. Compressor turns off then slowly goes back to about 30 psi. High side stays around 100 to 120 psi. Expansion valve and compressor already replaced. I'm guessing there is a restrict somewhere.
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Sunday, June 16th, 2019 AT 12:12 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Yes, there is a restriction on the low side.

Did you use a new expansion valve? If you did, good chance the evaporator may be the restriction.

Roy
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Monday, June 17th, 2019 AT 3:58 AM
Tiny
INTEX
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Yes new expansion valve. A/C barely runs. What's a good way to track down the restriction? Basically it's the condenser/receiver dryer or evaporator?
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Monday, June 17th, 2019 AT 4:16 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, you will need to use air pressure to find the restriction. Check both the condenser and the evaporator.

I would not assume the new expansion valve is good either. It could also be the issue.

Roy
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Monday, June 17th, 2019 AT 4:39 AM

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