General Information

With the introduction of model 140 in model year 1992. Mercedes-Benz was the first car manufacturer worldwide to use environmentally friendly refrigerant R134a. Beginning in 1991, all other models (except 201) were converted to use refrigerant R134a.

Due to the increasingly scarce availability and eventual production phase out (1995) of refrigerant R12, models using Nippondenso 10P and 10PA A/C compressors may be converted for use with refrigerant R134a.

In case of a necessary repair under the terms of the Limited New Vehicle Warranty or the Spare Parts Warranty and if R12 is no longer available, a warranty claim for the conversion can be submitted. In all other cases any conversion to R134a is the responsibility of the vehicle owner.

In performing this conversion, the following steps must be followed:

A. Preparation/Testing of the A/C system
B. Testing A/C System for Refrigerant Leaks
C. Removal of Mineral Oil from A/C System
D. Replacing Receiver/Drier
E. Installation of Service Valves
F. Filling A/C System with R134a Refrigerant
G. Affixing new R134a Label
H. Performing Final; Function Test of A/C System