A/C-which valve is high/which is low?

pearldrum · 06-21-2002, 08:19 AM

To do a 134a conversion, which valve on the A/C is the high side and which is the low side, the one under the car or the one under the hood?

pearldrum · 06-21-2002, 08:38 AM

ok, so the valve is on the compresser, i know that now, but how do you hook the hose to it, is there some kind of 90 degree adapter? the alternator is in the way...

pearldrum · 06-21-2002, 08:39 AM

ok, so the valve is on the compressor, i know that now, but how do you hook the hose to it, is there some kind of 90 degree adapter? the alternator is in the way...

AFJuvat · 06-21-2002, 10:26 PM

See attached figure.

General rule of thumb, the low pressure side is the hose that gets cold when the AC is running, it is also a bigger hose.

With the exception of AC equipment designed for the purpose, NEVER connect anything to the high pressure side when the AC is running.

To do a simple conversion, you can do everything you need from the low pressure valve.

AFJuvat

pearldrum · 06-22-2002, 07:17 AM

your car is a lot different, mine was under the car, on the compressor with the alternator in the way, I needed a 90 degree valve, which i just got

DennisR_944 · 06-22-2002, 07:20 AM

My car is exactly opposite. The valve in the picture is the high side. I didn't need an angle. It is tight but doable without one.