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.
Sunday, June 16th, 2019 AT 12:12 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 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
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
+3
Monday, June 17th, 2019 AT 3:58 AM
Tiny
INTEX
  • MEMBER
  • 2 POSTS
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?
Was this
answer
helpful?
Yes
No
+4
Monday, June 17th, 2019 AT 4:16 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 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
Was this
answer
helpful?
Yes
No
+5
Monday, June 17th, 2019 AT 4:39 AM

Please login or register to post a reply.

Related Air Conditioner Recharge Content

Air Conditioner Recharge - Simple
VIDEO
Air Conditioner Recharge - Simple
In­struc­tional re­pair video
Air Conditioner - Add Refrigerant
GUIDE
Air Conditioner - Add Refrigerant
In this guide we show you how to add re­frig­er­ant to your car's air con­di­tioner sys­tem, sim­ple and easy. Get­ting started, you will need a re­frig­er­ant kit that looks like this...
VIEW MORE