Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Question: V5 Control Valve

paulo57509 on Fri March 12, 2010 12:33 AM User is offline

Year: 1992
Make: Chevrolet
Model: Lumina
Engine Size: 3.1L
Refrigerant Type: R12
Country of Origin: United States

I'm gathering parts to convert to R134a.

I purchased a replacement compressor control valve that is supposed to be for use with R134a (to be installed into a rebuilt compressor I purchased for ACkits).

The control valve is a Four Seasons, P/N 38846. Inside the box is the control valve with a rust colored color code painted on the end. There are black o-rings installed on the valve. There also a bag with the snap ring and some blue o-rings inside.

My questions are:

1. I'm supposed to use the blue o-rings because I'm retrofitting to R134a....yes?

2. Is this valve actually for R134a retrofits? Why would this valve then come supplied with both black and blue o-rings?

3. Am I good to go by swapping this valve with the one that's already in the rebuilt unit?


JACK ADAMS on Fri March 12, 2010 10:07 AM User is offline

This valve is for either R-12 or 134a refrigerants according to the Four-Season web site. You could change the o-rings to the blue for 134a applications.
134a conversions will require you to replace the accumulator and expansion device as well as flush the system. Be sure to evacuate the system and charge with the recommended amount of 134a refrigerant. This will not be the R-12 recommended charge amount. Start off with 75% and check temps as well as gauge readings. Hope this helps and good luck.

TRB on Fri March 12, 2010 12:49 PM User is offlineView users profile

Control valve with the color code brown is for R134a.


When considering your next auto A/C purchase, please consider the site that supports you:

paulo57509 on Fri March 12, 2010 5:55 PM User is offline

Jack and Tim,

Thanks for the replies.


Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.