Quote:
Originally Posted by A930Rocket
Mine is working, just not very well. I added some 134, but who knows what was in there before hand. I want to empty it, replace the receiver dryer and use some more 134. I may do as you did and see what I find before opening it up.
I've seen where guys pressurize them to 200 psi. Seems like a lot to me.
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If you have a leak, I think you will find it with soapy water if you just use up to 100 psi. I have done this leak finding technique with several of my old P'cars and have found compressor leaks, drier leaks and hose leaks which once fixed all resulted in a successful charge with 134.
I switched my '92 BMW 325i over to 134 after finding an o-ring leak at the expansion valve (just added a new drier, an oil charge/134 mix and 134..... hoses and seals remain stock). I did this when I first bought the car used in '98 with 140k on the clock. It now serves as my daily beater/driver with 320,000 miles and the AC still works great with only needing a can of 134 every 3-4 years to top it off. Your '91 might have different components as that was around the time frame that 134 was coming on the scene. My '92 originallycame with r12, but I think it had 134 compatible components. All my older Porsches still have their old r12 hoses and they do not leak much if at all as they had soaked for years in mineral oil which pretty much seals them up effectively in old cars. IOW, brand new r12 hoses leak 134..... old r12 hoses generally hold 134 fine in my experience with several switch overs I have done on my cars.