ok...went and bought some r134a refrigerant and the hose to try and charge it again..the a/c compressor turned on and the clutch moves.... 2 secs later i heard why i havent been able to hold refrigerant in the system.. on the high side the valve stem over there is leaking.. i pulled it out and the o ring and everything was still in tact... ideas? Its definentely that high side valve stem...if i put my finger over the opening, the hissing sound goes away... can i simply just buy a valve stem? if so..is it a GM part?

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1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil, Accel 8.8 wires, Auto Meter Gauges (Water, Clock, Fuel Pressure, and 5" Sport Comp Tach)TB Bypass, 4th Gen Seats

Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, Posi, Spohn Torque Arm & Subframe connnectors

"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

 

btt

------------------
1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil, Accel 8.8 wires, Auto Meter Gauges (Water, Clock, Fuel Pressure, and 5" Sport Comp Tach)TB Bypass, 4th Gen Seats

Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, Posi, Spohn Torque Arm & Subframe connnectors

"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

 

It's a more or less regular Schraeder valve core. I wouldn't go back to GM for it. If you have a Blackstone in your area, that would be a place to start. Otherwise, NAPA or some other real parts store would have them; or any place that sells appliance/refrigeration parts.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Dime a dozen part from any decent parts store... meaning not autozoo, etc.
Most will try to stick ya with the carded stuff that comes 2 or 4 to a pack, but other places will have them in a box and will sell them one at a time.

 

I compared it to my shraedar(sp) valve core and they didnt look at all the same?? I have a Fuel pressure gauge so im not using the old valve core.. can i swap them?

------------------
1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil, Accel 8.8 wires, Auto Meter Gauges (Water, Clock, Fuel Pressure, and 5" Sport Comp Tach)TB Bypass, 4th Gen Seats

Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, Posi, Spohn Torque Arm & Subframe connnectors

"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

 

btw..what would the "technical name" on that part be?

------------------
1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil, Accel 8.8 wires, Auto Meter Gauges (Water, Clock, Fuel Pressure, and 5" Sport Comp Tach)TB Bypass, 4th Gen Seats

Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, Posi, Spohn Torque Arm & Subframe connnectors

"I'd rather run last in a full out race, than to NOT have run at all"
#3 Forever

 

AC valve core?

The one from the fuel gauge should work provided the o-ring is ok and the same size as the one on your ac... and it probably is.