AC Convert r12-134a. on/off compressor and fan HELP! - Third Generation F-Body Message Boards

1986iroc350 · 06-05-2008, 06:50 AM

i recently converted my ac from r12 to 134a. with the kit from autozone. there was no r12 left in my system. so after putting in the pag oil and 3 cans of 134a. the system worked great in the garage for about 1/2 hour at idle. car cooled great. and was pretty proud of myself for spending 40.00 and a cool ac. Now when i get the car on the highway. the fan/ac/clutch does not engage at all. when the car gets to operating temp. although i tried it today on the way home a t 3am and it worked fine all the way home. of course its alot cooler out and the temp on the engine isnt as high since its at nite. is there a relay or switch that maybe needs to be replaced? any help would be appreciated thanks

MrBill85T/A · 06-05-2008, 07:11 AM

134A operates at a higher head pressure, if your systems has a R12 high pressure switch, this maybe holding out the compressor.

QuickStyle · 06-05-2008, 08:47 AM

did you flush the system before you added the new oil? if not, you will have too much and incompatible oil, which will cause insufficient cooling at higher pressures.