Working my way through minor issues. I assume this was originally r12. There are new style (quick couple) connectors on the low side line on the right side of the engine bay and at the dryer, but both are low side fittings. Did the car come with these or should these fittings mean it has been converted?
Also, does anyone know the approximate capacity of the system in pounds or grams?

 

Sounds like someone did a 1/2 ss conversion, you should have a larger
R134a service port on the high side. So, expect there could be other issues.

Approx R134a charge for single evap system shark is 860 grams R134a

928 AC

 

Finally got a call-back from the PO.
134 conversion by local mechanic.
Thanks for the info and link