Re: Old Air conditioning
done a few of these...not TOO hard.
If your handy with tools its pretty Easy.
O-rings. the standard ones will work, but R-134 will deteriorate them rather quickly leading to refrigerant loss. As i have my own shop, i bought a kit of R-134 o-rings from repco for about 30 bucks. they are easily recognised as they are green.
Compressor. the standard compressor will handle R-134 but the boffins highly recomend changing the oil and seals. I had this done, and now mine rattles. My recomendation here is to get one from a wreckers off an EBII or later (that was original with R-134)
Tx Valve. I have not changed mine and it works just fine. (keep in mind with the O-rings that they are on BOTH sides of the TX)
Condensor. I am still running the original R-12 unit and no problems.
reciever/dryer. the boffins and law says this needs replacing. there is no actual difference in the unit itself. ( i did my R-134 upgrade after an accident, so i needed one anyway).
Pressure lines. Leave as is. But do check the flexible one under the LH headlamp....there is a slip joint here that is prone to leakage...if it is leaking replace BOTH sides of it.
Gassing points. R-12 uses what is pretty much a tyre valve fitting, whereas R-134 has its own definitive fitting. The good news, is that in most cases this fitting can be removed and fitted to the R-12 fitting. this needs to be done or it can't be gassed. Most gas-guys will carry a pair, fit them gas your car and then remove them...best to have your own i reckon...remember i started this sentence with most. You should be able to get these off another car from the wreckers.
hope this helps