Accepted Answer

the system does not have that many disadvantages, it operates the same as the old system, and yes you would have to go to the new 134a, the disadvantages of the new system are the AC clutch drive, your gas mieage will go down a bit, the condensor and drier will have to be added, along with a thermostatically controlled switch that splices into your wiring harness, and the new 134a system, when swapped to an older vehicle, tends to not put out the required amount of cold air, the older components in the vehicle like the fan just were never made for this application, and you will also notice it being muggy in the car as the pump will not spin to the required rpms and move the refrigernat fast enough. ut 134 is cleaner, not harmfull, lasts longer and is easier and cheaper to service. you can still find the pieces for the old R12 system and have it installed and get it working, it is not impossible, just getting harder to find the parts. and before doing that, you need to locate R12 refrigerant, you cant purchase it, but the shop that does the AC work can. it comes down to alot of shops just not wanting to do R12 work anymore, and alot have stopped and only do r134a now. you may have no choice if no one in the area will work on or service r12 systems.

Expert:	oliver
Pos. Feedback:	100.0 %
Accepts:	157
Answered:	8/28/2009

Technician

schooled, trained, worked in industry for years. specialize in the odd issues