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Frigette Underrdash York Compressor 1970 C20

jaredmdean on Fri May 01, 2015 10:18 PM User is offline

Year: 1970
Make: Chevrolet
Model: C20
Engine Size: 307
Refrigerant Type: R12
Ambient Temp: NA
Pressure Low: NA
Pressure High: NA
Country of Origin: United States

Good evening -

I bought a 1970 AC with a Frigette Underdash unit. The compressor is a big ol' York and was in a plastic bag with the brackets and I've installed onto the motor with no issues. My question is what to do from here. I grew up in the residential/commercial HVAC world but I'm not sure what to do on this since its R12 and needs to be converted etc.

The blower works
The Clutch clicks when 12v is provided
There is oil in the compressor
The compressor and lines have been left open
There are black O Rings at the compressor connections and they leaked with a quick leak test

Should I risk the hoses? If not, where do I turn for the right hoses?
Is there anything I need to do to the evaporator when converting? Condenser?
Can I keep the existing R-12 Schrader valve fittings at the compressor? (someone said those need to be changed)

Anything else I need to know? I'd hate to go buying a whole new system if this one will work.

Thanks in advance!

1970 C-20
1992 LX 5.0
1974 CB-450

mk378 on Fri May 01, 2015 11:14 PM User is offline

Can't really trust anything that is NOS rubber. New hoses and o-rings throughout. Don't use NOS receiver-drier either, it is likely no good from absorbing water during storage, and will not be 134a compatible.

If you want to use 134a: you should also use barrier hose, which will likely require different fittings. Screw clamps can't be used with barrier hose, need crimp-ons that grab the outside of the hose and lock it to the pipe. Evaporator and TXV will work with 134a but you should replace condenser with parallel flow. Fan, clutch, and shroud need to be in top shape for all the condenser airflow you can get. Change oil to PAG or POE. Install conversion fittings-- remove schrader valve cores from original fittings and screw on the converters which have their own valve. Do not use the chain-store aluminum conversion fittings, use steel ones like the site sells.

TRB on Sat May 02, 2015 6:32 PM User is offlineView users profile

New hoses are a must in my opinion. Check around locally for a shop that rebuilds hoses.

If you plan on R134a? I would replace the condenser with a universal PF model. Use a York to Sanden adapter plate and run a modern compressor.


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