The recharge connectors are different between R12 and R134a. R12 are screw on, R134a are pushon similar to air hose connectors.

If the car was converted to R134a, the expansion valve would have been changed as all the O-Rings. There would be a blue lable with a date on it.

You cannot add R134a to an R12 system.

http://freeze-12.com/

http://www.supercool.ac/intro2.htm

http://www.acsource.com/index.asp

http://dieselgiant.com/index.html

A DIY page

http://dieselgiant.com/repairyourac.htm

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.