Those are R134a valves.

Should have caps on them...........

Those are R134a valves.

Should have caps on them...........

OK found the caps in stock at O'Reilly - yea!

Thanks for verifying R134a valves. So I guess previous owner switched it over. Last AC I did ( R12) I thought it has threads on outside on valves so made me question system. The AC over the last few days just was not blowing crispy cold. Got a can of the 134a and it took less then half to get it back in range now she is cold cold.

Only bummer is I thought I was "cool" ( no pun intended) for having a can of Oil Charge R-12 /Oil (4oz) and a a 12 oz can of R-12, PLUS an unopened recharge kit and an opened recharge kit. ( Hose and can "clip" attachment to hose.) Oh well guess that goes back into the storage for another 25 years... I was so looking forward to using this stuff having saved it so long, but oh well....I guess I am a R134a system now..

instead of just replacing the caps at minimum i would replaced the entire r-134 conversion fittings, they dont look to happy. and they are only a few dollars a piece.

Just blast them clean.........

If they're not leaking, leave them alone.     

If I tried to replace them, they'd probably start to leak, and I'd lose my whole r134a charge............