W124 Aux fan upgrade -- Single to Dual - PeachParts Mercedes-Benz Forum

ps2cho · #18 06-25-2012, 03:31 PM

Thanks for the thread...
He mentions:

100F ambient
"So to compare the 2 lets discuss the differences. The 240D has no tinting. I run R12 in a standard system with pressures of 22 low and 265 high. The 82 300TD has R134a. A NEW evaporator as well as everything else. tinting, legal tinting, and a parallel flow condensor. R134a and the aux fan is on all the time. I'll try the system with it in the normal mode."

Well I am getting like 60psi low and 340psi high...and I am not overfilled. I am in fact, almost underfilled. FSM states I need 80% of R12 amount, I have 60% in the system. It was less than 2x12oz cans, so about 20oz. I was concerned over the high pressures, so I completely flushed the system thinking maybe it was overfilled with oil or sludge and replaced the TXV and drier, it dropped pressures a little, but not much (it was 65psi low and 360psi high before) INCLUDING aux fan on high the entire time. The system just stopped taking anymore out of the 2nd can. I put it in ice water ran at 2000rpm -- wouldn't take it in and no wonder with those pressures...