thanks,

After all that was listed I didn't see mention that the auxilliary fans operation was confirmed? Failed fans are the most common reason for excessive high side pressure. I noted that the switch is new but the resistor, relay and fan motors all can fail. Before you replace the hose bridge the high pressure switch and verify that the aux fans are running. Diagnose and repair em if they aren't before charging and running the system.

I'd like to make a comment here if I may. It has nothing to do with the "which is better" R134A vs. R12 argument.

One long-time member of this forum has repeatedly posted about falling R-12 prices. It has come down but is not as cheap OR as readily available as R134A.

Here's some reality for you.

I live in a fairly large U. S. city. I've discovered over time that fewer and fewer shops are stocking R-12. They simply do not wish to deal with it any longer. There may be exceptions to this rule, but in my area, you're going to have a very difficult time finding a shop that will service an R-12 system. If you do, they want anywhere from $100 - $150 a lbs. for the refrigerant.

If you service automotive a/c systems for a living AND you still make repairs to R-12 equipped cars AND you don't screw your customers by charging them the rates I posted for refrigerant that I know you can buy for $15 - $20 a lb. in bulk, I salute you. You are an EXCEPTION to the new rule.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"