a/c conversion process for 3.2
 

anyone convert r-12 to r-134 -i've noticed for small $ one can buy kits at walmart or autoparts to convert "any car"over to 134a-anyone done this and if so is there specific kit to purchase? or do you need to spend $1000++ to do it "right"--also any experience with using r-12a in old system? thanks

Do a search. This subject has been beaten to death. Lots of great info on how to do it right. IMHO, the conversion kit will be a waste of money and time. And yes, it costs well over $1K to do it right. Your stock 3.2 system is virtually useless and the hoses need to changed to barrier hoses for 134A anyway.... Good kits costs ~ 1500 - 2500 and figure a good 10-12 hours labor. Good Luck.

You'll find everything you ever wanted to know about A/C for our cars here:

http://forums.pelicanparts.com/porsche-911-technical-forum/364796-ultimate-ac-thread.html

I switched over my 87 from R12 to 134. AC didn't work when I purchased the car, had a garage remove the R12 and switch over the fittings. I then replaced the receiver / dryer, and borrowed a vacuum pump from a friendly HVAC contractor. Let the vacuum pump run for an hour to evacuate any moisture from the system. Recharged with a couple of cans of 134a. Biggest headache I encountered was trying to diagnose a failed AC temp switch with the system not charged.
System runs with the 134a, but as many will tell you the performance isn't great though it's better than nothing. Because of the lack of barrier style hoses the system charge needs to be replenished yearly.

Short answer, you need to change the R/D to one for R134a, and put the correct oil in the system. Barrier hoses are good to do, but cost $. I also changed the expansion valve, but didn't see a lot of improvement. I think the rear decklid condenser adds a heat load if you get stuck in lots of traffic.

Most A/C specialist shops will do a LEGAL conversion to R-134 for ~$200, same for even less. The refrigerant they drain/exact is worth some serious money.

If you already have to add refrigerant from year to year, as many do, you could just change the fittings (usually included inn the kit) and begin "recharging" with R-134.