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.

 

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

 

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.

 

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

 

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