AC question/Steve et al
 

Got the warm left/cool right AC problem with my 210 chassis. I am assuming that I may be low on refrigerant. Below are the diagnostics I just did. Would someone please verify this for me? When I do recharge, can I just use the high pressure indicator on the climate contol unit to monitor the pressure, hook up the new refrigerant to the low side and stop when I reach the appropriate pressure? Can someone post the appropriate pressure/temperature curve for me to follow please?

cold engine/ warm engine/
not running warm & idling
1 75 87
2 71 73
3 75 66
4 73 53
5 75 67
6 76 166
7 4 bar 11 bar
57 psi 156 psi
8 73 121

Thanks.

Len
'99 E300TD 90,000 miles

Oh, and the error codes I found were
B1416 - coolant circulation pump
B1459 - series interface (K2) connection to instrument cluster
Also had an "FF" - not sure if that means anything.

Len

Pressures are too low and evap temp too high. Only proper way to charge is to weigh the refrigerant.

Did you use to have a problem with your AC before?

To Ron - Yes, three years ago I replaced the temperature sensor indicated by #5 in the diagnostic tests above. Since all the temperatures are basically equal on a cold engine, I assume all the sensors are okay. Last time #5 was way out of whack. Have never had to add refrigerant to the system yet.

To Steve - so an addition of refrigerant is out of the question? Must I evacuate and start from square one?

Len