Wisconsin 5.0

Hey Guys...remind me which is the low pressure side of the AC system for adding coolant. I have a 90 GT. There is a valve on the compressor and a valve on a line that comes over the enginefrom the passenger side, in front of the distributor, and then in to the compressor.
Thanks much.

corvetteguy

I thought the fitting on the a/c hose only
fits one of the shrader valves?

ctrcbob

Ditto to what Corvetteguy said.

Seeing as how that car is a 90, if the A/C has not been upgraded, it uses R12 and the car has a Schroder valve in the linewhere you connect the R12 hose. Note that you can no longer buy R12.

If the car has been converted to R134a, it will have a "quick disconnect" in the low pressure side. The R134a kits will only fit this one fitting.

Wisconsin 5.0

Thanks guys...I see that the car has not been upgraded. Off to the shop I guess.

JESTER01GT

High side has smaller hoses but bigger shrader valves. Low side has bigger hoses and smaller shrader valves