Monday, November 17, 2008 - 12:24 pm, by: Mark Ribbans(V8gtsoarer)
I would not recommend doing this (by passing the sensor) as it will most likely result in smoke coming from your compressor which will in turn put little metal filings all through you A/C system.
Peter Nitschke Junk Filterer South Australia UZZ30 UZZ31
Monday, January 12, 2009 - 01:48 pm, by: Harry Lemmens(Wombat)
Okay ... Been a few years now that my A/C light has been flashing. In my case, it was definitely a stuffed "Lock-up" sensor in the pump. Since the pump was not seized, it was a real pain.(I used a diagnostic mode to run the A/C on hot days!)
I finally cooked up a three transistor generator that generates a fake signal to trick the A/C electronics. This works a treat.
Being a tight arse, Since the gas has finally leaked out of the system (well not quite all out, there was still some gas in there as an audible hiss was evident when I pressed one of the valves) I recharged the system with LPG. This works so well I am somewhat surprised as the A/C was never as good with R134 as it is now with common LPG. (from a 8.5Kg barbecue gas bottle)
The amount of gas used from the bottle was trivial. I guess that perhaps 300 grams of gas all up went into the system ... lets say less than a dollars worth of gas! It took about 20 minutes, although I was being fairly careful. Too much pressure from the LPG bottle would blow my jury rigged connector out of the low pressure port of the A/C. (Low pressure port is the one near the compressor, in my case it was blue, and clearly had a large L printed on the cap.) I would post how to do this, but I can see people blowing themselves up, and then blaming me ...
I will post a schematic of the 3 transistor generator for people having similar problems. (Not just for Soarers either ...)
Monday, January 12, 2009 - 03:30 pm, by: Harry Lemmens(Wombat)
Yes ... most were, as it has been a requirement for a very long time now.
However, a lot of conversions were very crudely done, with "back yarders" going around, venting the R12 and replacing with R134, but without replacing the original R12 oil. I suspect this is why so many compressors ended up making a lot of noise.
My compressor was so noisy when I initially got the car (back in 2001) that I had someone top up the system with the correct oil for R134. Curiously, with LPG as the refrigerant, I swear the compressor is now much quieter than it was ...
Sunday, January 18, 2009 - 11:17 am, by: Harry Lemmens(Wombat)
here are the schematics ... While I actually built version 1, version two is the one I would have built had I the relevant parts on hand. If I were to purchase the parts, version two is the one I would make. Mainly since it is much easier to build in "dead bug" form. (dead bug, as it resembles dead bugs stuck in place.)
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Version one of the generator
