|
A lot of people just get the r134 retrofit kit (fittings and oil) and charge it with the new refrigerant. The correct way to go would be to find a shop with a machine capable of flushing the A/C system and also replace the dryer and Thermal expansion valve/orifice tube depending on the car. I don't remember if 3rd gens had an expansion valve or an orifice tube. R134 is not compatible with the oil used in old r12 systems and you will have issues if the correct oil is not used and even if the wrong amount of oil is added.
Flushing can be a labor intensive process if the car is equipped with an expansion valve as they are mounted on the evaporator and have to be removed in order to run the flush.
With all that said I've done a few myself where all I did was install the fittings, vacuum the system for 30 min then added oil and charged with r134. I haven't had any issues with the ones I've done that way but it's really not the correct way to change it over.
If you decide to have if flushed just keep in mind that not all A/C machines have the capability of performing a flush, I would double check with the shop about there machine before you have anything done.
|