We DO NOT RECOMMEND THIS TO OUR CUSTOMERS!
A proper retrofit requires a larger condenser for proper cooling and safety; the pressures and temps w/ R134 are much higher than w/ R12. The higher pressures mandate that a HI pressure cutoff be added to avoid venting R134 when it boils (and it will if you don't retrofit properly). All responsible professionals are obligated to do this per EPA regs! Incompliance MAY threaten the environment but certainly threatens our freedom as more regs are enacted to curb it. The efficiency of the conversion will vary dramatically from climate to climate, hot and humid yields are poor. You also have to flush the system thoroughly, which is not a DIY job unless you have really clean and abundant shop air, or dry nitrogen (which we use). THE BIGGEST PROBLEM IS THE OIL- a PAG type compatible w/ R12 and R134 is required b/c you'll never get all the R12 out. We have seen a BUNCH of compressor seizures w/ PAG. These 2nd gen Hitachi compressors do much better w/ stabilized mineral oil. I am a licensed A/C tech and encourage you to visit the BBS at aircondition.com (no affiliation) -the guys have great advice. Those Wal Mart and Interdynamics kits have caused a ton of grief...

Best of Luck,

Dan

Dan Heard
Manager
usedmaximaparts.com
P.O. Box 2207
Newnan, GA 30264
678-378-4694
Fax 775-599-1906