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Originally Posted by GVB
I have seen a couple of cars that had a massive problem due to mixing of the 12 and 134 oils. I think 134 is great, for a 134 car, and 12 is great for a 12 car. Have you ever seen or had to fix a contaminated system? I have, and I am a very firm believer to not mix the two up. It's not funt to fix and it becomes a hazard when you have to store the contaminated fluids. Thats my point I am tring to make on a retrofit.
GVB
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I can't say that I have had the pleasure and I understand your point; however if the conversion is not performed to a certain standard-YES problems develop........IMHO overcharging a system falls into the lees than standard category.
When retrofitting R-12 to R-134 I have always followed the manufacturers written instructions (for good reason) and I have seen few failures when the instructions are followed to the T. Now contamination from mechanical failure and or the use of unusual refrigerant blends (the low cost alternative mixtures that only reek havoc in the automotive repair world-especially with recycling equipment) I will do several (6-10) of those in a year. As an extra precaution when I convert the AC system from R-12 to R-134 I always go a few steps further mainly because I am from the old school of AC repairs. I flush the condenser, the evaporator and all the lines as best as possible. When the flushing is complete I install a new expansion valve and a new receiver drier as well as new pressure switches (always). I also R&R the AC compressor-drain it and then refill it with the prescribed amount of oil (unless the comp is getting it's triennial replacement.
Regardless of what a vehicle is willing to pay for a repair their expectations for the repair to be performed well seem to always be much higher-meet and exceed their expectaions and charge accordingly
simple as that
