This is a tricky one to answer but I would like to add some personal observations.
As an industrial HVAC tech., I have run into several trolleys, busses, and cars that tried to drop 134a into an R12 system. Many worked without changing hoses, O-rings, compressor oil, capillary tubes, etc and they worked until the vehicle died of old age. But I have also seen many that had compressors seize, and this can be related to oil compatibility/moisture issues. Also, some hoses and orings must be changed when using a different oil or refrigerant. If it is an old junker daily car, then people quit using the failed AC rather than fix it but if it is a classic car and compressors are in short supply, it might be wise to make a more permanent change. There is another Freon I use that is a drop-in for R12. R414b (hotshot) was the first blend for dropping in without a loss of cooling, like you get with 134a. Problem with R414b is it can't be topped off as it leaks, the blend would be off. Plus it is more costly than 134a. There are many conversion kits available, some with hoses, fittings, and so forth. You might get lucky by changing the oil, O-rings, front bearing & rotary seal, and dropping in 134a. ----- Original Message ----- From: [EMAIL PROTECTED] To: [email protected] Sent: Friday, April 18, 2008 12:32 PM Subject: [Chevelle-list] A/C Question... Has anybody ever converted thier R12 to R134A? I have this 62 Cadillac that has A/C. I thought it might be neat if the A/C worked on it. I have to convert it over to 134A right? I'm assuming that there is zero refrigerant in the system right now. I've done a little research on it and it appears that besides vacuuming out any remaining R12, I need to change the compressor oil? The compressor spins freely, and smoothly. I have zero A/C experience. Do I need to change out anything else? Thanks for your help!!! ------------------------------------------------------------------------------ Get the MapQuest Toolbar, Maps, Traffic, Directions & More!
