500SEC (140.070) V8-5.0L (119.970) (1993)
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Refrigerant: All Technical Service Bulletins
A/C - R134a General Information
REF.NO.: MBNA 58/51, 83/38
DATE: August 1991
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
SUBJECT:
A.
SERVICE EQUIPMENT FOR REFRIGERANT R 134a
B.
INTRODUCTION MANUAL:
NEW REFRIGERANT R 134a FOR AUTOMATIC CLIMATE CONTROL
C.
LEGISLATIVE CONSIDERATIONS
The air conditioning system of all model 129 vehicles produced as of 6/24/91 (chassis end no. 038785) is filled with the new refrigerant R134a. The
models 400E/500E and all U.S. versions of model 140 will use this new refrigerant from the beginning of production. A green underhood label identifies
R 134a equipped vehicles. As other models follow, you will be informed accordingly.
A.
Service Equipment for Refrigerant R 134a
This new refrigerant requires the use of new, specialized service equipment which is specifically designed for the recovery/recycling and recharging of R
134a only. (Recycling means purification via filtration, and oil/water separation.)
Equipment which was designed for use with R 12 systems cannot, under any circumstances, be used to service R 134a systems.
The following are important technical points regarding equipment for servicing R 134a air conditioning systems.
^
A new type of leak detector which is designed for use with R 134a will be necessary.
^
All vehicles which use R 134a have new type air conditioning service connection valves. New type service adapters are required to connect R 134a
service equipment to the vehicle. These service adapters come as part of R 134a recovery/recycling/recharging equipment.
^
Initially, R 134a is being supplied through the MBNA parts network in 920 gram cylinders (part no. 000 989 03 48 10). An adapter valve (part no.
140 589 23 63 00) will be necessary to connect the cylinder to the charging equipment.
^
When R 134a becomes available in 15 and/or 30 pound containers, the containers will have the proper service fittings to allow it to be connected
directly to the service equipment.
^
Due to the anticipated high cost of refrigerant, MBNA strongly recommends using equipment that recovers/recycles and recharges refrigerant. See
equipment list for listing of R 134a approved air conditioning service stations.
^
Refer to the Standard Equipment Program catalog, the R 134a Introduction Manual section: "New Service Equipment and Products", or contact your
Mercedes-Benz Field Service Representative for additional R 134a equipment information.
NOTE:
