A/C for a 1990
 

Has anyone upgraded to run r13 on their 1990 model.The compressors look the same. I know this is a common upgrade on the 67-72. I couldn't find a lot of info for 88-94.

Re: A/C for a 1990
 

An R134A up grade is all you have now days.

Go to a GOOD local independent auto parts shop. They will get you what you need. A common request.

On my '88 GMC....

I replaced the condenser, compressor , evaporator, accumulator, lines, etc. ( all AC Delco)

The high pressure switch is now a 2-wire, so one wire is just a separate ground. My A/C is around 42 degrees.

Re: A/C for a 1990
 

Thanks for the reply mountie. 42 degrees now thats frosty.

Re: A/C for a 1990
 

i converted my 1990 to r134 7 years ago when i bought this thing. all i did was put the adapters on the fittings didnt have to change anything (no idea if you were supposed too). never checked the output temp but its keeps me cold on very hot days

Re: A/C for a 1990
 

When doing a retrofit, you should change the orifice tube and the accumulator. It's recommended to change the condenser. No need to change other components unless they are damaged or leaking.

Re: A/C for a 1990
 

42 degrees is good out of the vent..... It should be around that when fully charged.

It took me all Saturday to lift my dashboard high enough to replace my evaporator. ( my heater core was full of leaves, so a great time to clean it)..

Anyway, it would take only 20 minutes to raise my dash the next time, now I know where & which screws to undo.