1985 GL AC swap help/ advice

[two85s]

Hi everyone, I am taking the AC system from my 85 gl automatic parts
wagon and putting it into my 85 gl D/R wagon.  I bought a vacuum pump
and AC manifold set up from Harbor Freight to switch it over from R12 to
R134A.  I have researched about the process so hopefully I can do
it correctly the first time.  From Rock Auto I got the AC O-ring kit and
a new receiver dryer.  From Wal Mart the R12 to R134A valve kit and the
R134A.   After I get the parts removed I will flush the lines, the
evaporator, the condenser, the compressor?  Then I will replace O-rings,
put it together and vacuum pump and manifold test it before charging
with R134A.

1)  Can/ should the compressor be flushed/
drained?  The oil in it is for R12 correct, so that needs to be replaced
too, with what oil?

2)  The old receiver/ drier has the in/out
plumbing fittings, wires, an air valve, and a site glass( pic).  The new
receiver/ drier has only the in/out plumbing fittings.  What are the
wires, valve, glass for?  Are they necessary?

3)  My parts

wagon has a "AC ON/ AC MAX" switch (pic) my running wagon has a "Vent"
switch in that spot.  How should I best wire AC to turn on?  Ideally, I
would like two or three speeds (powers) for the AC, i.e. low, medium,
and high, and putting toggle switches would be fine with me if it would
be easier or better.  I have had the Dual/Range Wagon since about 1995 and never had AC.  Thanks for your help or advice.  Aaron

[Gloyale]

Swap the entire vent/ac button cluster.  You exisitng one won't have the electrical switch inside for reg/max AC.

[two85s]

Thanks Gloyale.  OK cool, I'll swap the entire cluster. 

Any thoughts about wires, site glass, and air (schrader) valve on receiver/dryer or how to flush compressor and type oil?  Any AC wizards out there.  This is the first time for me and I want to do it right.   Thanks very much, Aaron

[two85s]

Anyone, thoughts about wires, site glass, and air (schrader) valve on the receiver/dryer?

The new receiver/ dryer has only plumbing.  How/if to flush compressor and type oil? Thanks Aaron

[two85s]

Hi, I am still plugging away at getting the AC from my 85 parts wagon into my 85 driving wagon.  The connector on the compressor doesn't match up with the open plugs on the harness near the alternator.  Can someone tell me if one of these connectors is for the compressor.   Thanks,  Aaron