TRR12 to R134 AC conversion

What is actually involved. After I get my car's major service done, I want to convert!!!!!!!!!

The mechanic tells me that it only requires different seals (Viton?).

Henry,

I don't hold with the theory of only new seals.

IMO a proper conversion requires:

New Seals
New Oil
New Dryer
New Expansion Valve

It CAN be done by simply evacuating and adding retrofit oil and R134 freon. The professional says that the system should be drained, oil replaced, new dryer and expansion valve, new seals, fittings and a label. Even this is only a retrofit bandaid, who knows what will happen 5 years on with the system. It is however a viable option for most owners.

I converted 3 years ago. Replaced the receiver/dryer and compresor (blown seal) . Pumped the system down for 24 hours and filled it up with 134a. Used compatable oil for the compressor and 1 can of sealer and 1 can of ice cold then reg. freon until the pressure was at recommended psi. I just had the car out again today and with outside temp at 91* the air coming out of the vent was 40*. I did my wives 89 Volvo last year and still super cold.I never changed a seal or the poa valve. Just do it

Why replace the dryer? The mechanic told me that it only has to be evacuated.

Dryer gets contaminated so its a safe bet to replace it. Just take it to a auto store and have them match it up. Works great.

www.duracool.com

why do a complete conversion when their is an alternative to R-12?

The alternatives offered are often partly infammable, they contain such things as propane and other HCs. They are actually illegal in some states. Plus, if some money pinching soul decides to use it down the road, a good chance that we "overpaid, money grabbing" independents will end up contaminating our recycling machines (required to do A/C work, among other expensive equipment). Also, older dryers had different dessicant inside which will not be compatible with the R134 oils, they come apart and will clog up the system, cheaper to install a new one IMO.