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

OK to use R134 evaporator in an R12 system?

vettemed on Tue May 24, 2011 10:05 PM User is offline

Year: 1991
Make: Chevy
Model: Corvette ZR-1

I realized today that when I replaced my evaporator, I inadvertently installed one for a 94-95 model, which used R-134a. The core physically fit into the housing, but required a tiny modification to the plastic. I figured it was just one of those aftermarket parts issues, but I now realize there's a separate part for 90-93, which used R12. Probably a stupid question, but is there likely to be any problem with system performance in this case?

Edited: Tue May 24, 2011 at 10:19 PM by vettemed

GM Tech on Tue May 24, 2011 10:49 PM User is offline

All r-12 evaps, lines, hoses, and condensers used English threads

All 134a evaps, lines, hoses, and condensers use Metric threads.

Changeover for Corvette was 94 MY.

Metric threaded connections have a line cut in the nut or in the base of thread

So do you foresee an issue?

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

vettemed on Wed May 25, 2011 6:41 AM User is offline

OK, thanks. This aftermarket evap must have been an R12, but used the later design, as the threads were without question the correct type.

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.