flytyer

Need to find out what the pressure should be on the low and the high side on my Benz. We emptied the system yesterday and filled it. However it is not blowing supercold, just cool. No leaks and the compressor is working fine. When looking in the book for the correct pressure it stated not available. I have a -95 S420.

Thanks!!

ALLDATAdiy INFO

Mercedes only gives the amount of refrigerant to put into the system. This varies on your S420 depending on the VIN number, as well as if your car has Rear A/C or not. ALLDATAdiy.com shows the varience to be from 1150g to 1400g. What is your VIN? Does your Benz have rear A/C?

Mercedes does give the refrigerant pressure to turn the fans on and off.

RobertG

Is it possible that you have moisture in the system?
Look at the temperature /pressure conversion chart, if pressure is 10% above, then it might be contaminated.

Ambient temperature plays a big part in low and high pressure readings.
post your pressure readings along with the ambient temp.