[Shotimes] Retrofitting A/C

[Jonas Diener]

I have a '92 MTX that had a non-working A/C when I bought it.  For 
some reason I can't fathom, one of the previous owners hacksawed a 
section out of the upper line leading to the evaporator.

Also, shortly after I got it, the compressor seized up.  I had 
removed the compressor and been running the alternator on a short 
belt.

Now I'm trying to get the system working again using 134a.  Maybe I 
should mention that this is my first time doing any type of A/C work 
on a car.

I bought a new (used) compressor, and a new (used) upper line/dryer 
that had previously been used with 134a.

I also wound up having to replace the evaporator with a new one due 
to a one of the stems snapping off in my hand whilst removing the 
line.  Quite a PITA, but I got it done. Did the heater core at the 
same time.

Anyhoo, I flushed out the rest of the lines and the condensor with 
methanol, installed all new green 134a-type o-rings, and put the 
system back together.

Now it's time to charge it.  I have 4 12 oz cans of 134a, 12 oz of 
ester oil, and a cheapie "EZ-Chill" gauge/charging tool.

Though I've looked all over, I can't find the specifications anywhere 
that say how much oil and refrigerant to put in to the system.  Does 
anyone know, or know where or find them?

I understand that when converting from R12 to 134a, one should 
determine the specified amount of R12, and add 80% of that amount of 
134a, and to use the same amount of oil as specified for R12.

Also, I understand I am supposed to hook the charging tool to the 
charging port on the "low side".  I am not sure which port this is. 
I see two -- One near the condenser towards the front of the car, and 
one on the large line next to the firewall that connects to the upper 
stem of the evaporator.

I have 134a port fitting adapters.