PeachParts Mercedes-Benz Forum - View Single Post - 88 300CE R134a Conversion

hornbrod · #4 08-06-2005, 11:30 AM

Thanks you very much for the replies. When I bought the car the original owner furnished all maintanance records from day 1. The detailed bill on the conversion states the compressor, resceiver/dryer and all O-rings were placed, and included a system flush. But he was only charged for two cans of R134a. Looking back through more service bills show the mono valve was also changed in Jun 00. Several of the service bills are hard to read, but there were multiple R134a A/C charges earlier than that; one bill states that the system is mixed. But it was always charged with R134a. I think the car was never converted properly, can not find anything stating a complete evacuation and flush for the system.

I have tested the aux fan by shorting the two wires on the pressure switch; the single fan runs on low speed as it should. Also from the temp switch on the head, fan runs at high speed as it should. The mechanic states that after he charged the system, the fan did cycle off and on at the correct pressures. Machine man, my guy didn't say the R134a would not work, just that it will not get a cold or run as efficiently in a Benz as the original R12. So, as Larry suggests, I'm going back to square-1 and reconvert back to R12. The system is unsat now, there are bubbles in the site glass, and I'm unsure of what is in the system. I think this is the best course of action now. At least this way I'll know what I'm working with.