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Ready for First Charge

chuck800 on Tue June 21, 2005 8:57 AM User is offline

Year: 1976
Make: Pontiac
Model: Firebird
Engine Size: 350
Refrigerant Type: R134
Country of Origin: United States

Okay, so I now have the new compressor, new VIR, and all new O-rings installed. New fabricated hoses and muffler as well as a vacuum that holds true. Now for the charge.

Pontiac manual states I will need 5 each 15 oz cans of R-12, would this amount be the same for 134???

Am I to assume that the A/C system using all original or OEM parts (A6 Compressor) holds 75 ozs of refrigerant???

I have been told that I might have to empty one of the cans into the system as a fluid, I guess this means holding the can upside down, true or not?

Any help would be most appreciated.


TRB on Tue June 21, 2005 9:48 AM User is offlineView users profile

Refrigerant capacity sounds a little high. I thought those system held more like 64 ounces of R12. You will use less R134a in a R12 system so be careful not to over charge the system. Watch your pressure readings and vent temperatures as it is easy to over charge with R134a.

Many say you need to charge a system as a gas and yes that would be the most correct way to charge a system. Myself, after getting a pound od so in the system and as long as I do not have gauge set hooked to the back of a compressor I charge the system as a liquid.


When considering your next auto A/C purchase, please consider the site that supports you:

Dougflas on Thu June 06, 2013 12:11 PM User is offline

VIR systems work much better keeping them R12.

Olds442 on Sat June 15, 2013 7:30 AM User is offline

Yes, after going to all that trouble to replace parts, why wouldn't you keep it R-12. It cools better and doesn't require any re-engineering.

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