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A/C not charging properly

mazdaguy on Thu June 10, 2010 9:36 PM User is offline

Year: 1994
Make: Mazda
Model: Mx6
Engine Size: 2.5Liter
Refrigerant Type: R134A
Ambient Temp: 78 F
Pressure Low: 8-65PSI
Pressure High: 100PSI

I tried to charge my system with a can of R134a. One quick squirt of R134a causes the low side to jump from 8psi to 65psi. If I remove the low side coupler I hear a quick puff of refrigerant escaping. Once I replace it the pressure is back to 8psi or so. This happened several times. It’s almost as if there is a blockage near the low side port creating a small space which fills quickly with R134a. The compressor is constantly running. Anyone have an idea what's wrong? Thanks a bunch

Edited: Thu June 10, 2010 at 9:48 PM by mazdaguy

Chick on Thu June 10, 2010 10:36 PM User is offlineView users profile

Did you check for a leak? if so, fix it, and recharge properly.. You need to recover the refrigerant, pull a deep vacuum and recharge the proper amount back into the vacuum, and then trouble shoot. Adding with a kit can is gonna ruin your system.. Do it right and you'll do it once...

Email: Chick


Freedoms just another word for nothing left to lose

mazdaguy on Fri June 11, 2010 10:44 PM User is offline

I checked for a leak and the system was not leaking. What I don't understand is why the low side pressure jumped way up with only ine squirt of the can and when I removed the can the low side pressure dropped down to 8 PSI. The system is acting like the fill valve on the low side won't allow any refrigerant to enter the system, but when i remove the can and take a separate gage reading, the pressure is only 8PSI.

CCWKen on Fri June 11, 2010 11:34 PM User is offlineView users profile

Are you using a gauge setup with a can tap? Did you open the low side valve?

Ken Kopsky

Custom Car Works
"Rules are for the guidance of wise men and the obedience of fools."

mk378 on Sat June 12, 2010 9:25 AM User is offline

It's normal for the gauge to go up temporarily while charging. The hose and service port are a considerable restriction, and the only way gas will flow through a restriction is to have a pressure difference. Just let it keep charging.

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