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Checking, correcting fluid level in air conditioner/auto. climate control - wh8312pkw0000x(8312)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Checking and correction of the fluid level Model 107 from 8/85; 123; 124, 129, 140 up to 6/93; 126 from 9/85; 201 from 1/85 

REFRIGERANT R 12

Model 107 123 124 201.03
129 126    
201.01 140    
201.02      
201.12      
Capacity 1000 g 1300 g(1)) 1100 g(2)) 950 g
(1) Model 140 with rear air conditioner 1500 g.
(2) Model 124.027/127 with rear air conditioner 1250g.
REFRIGERANT R 134A

Model 124 129 140
Capacity 1000 g(1)) 950 g 1200 g(2))
(1) Model 124.029/127 with rear air conditioner 1150 g.

(2) With rear air conditioner 1400 g.
NOTE: A precise check of the quantity is not possible on the observation glass. At higher ambient temperatures (> 35°C) foam or a few bubbles can also be present even when charged with the correct quantity.

In the event of refrigerant loss or suspected leakage of the system the correct charge quantity can only be ensured by completely emptying (recycling) and recharging the system, before recharging check system for leakage. The correct charge can only be achieved by weighing the refrigerant or by using a charging cylinder or automatic air conditioner charging unit.


Please observe the newest information regarding the correct charge for each model in the Introduction into Service documents and Repair Instructions on microfiche.

A. Models 107, 123, 124, 129, 201 

Fig 1: Locating Pressure Switch With Fluid Reservoir - Illustrated On Model 124
G05440798Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Illustrated on model 124

Observation glass (arrow) on fluid reservoir clean.
Electrical lead on pressure switch (7) disconnect.
Engine idling.
Air conditioner or automatic climate control switch on, function "Defrost".
Electrical lead on pressure switch (7) connect, while observing
Observation glass (arrow) on fluid reservoir The refrigerant level should increase shortly before the electromagnetic clutch switches on and then flow through without bubbles (i.e. refrigerant no longer visible).

B. Model 140 

Fig 2: Locating Fluid Reservoir
G05440799Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Locating Fluid Reservoir (6-Cylinder Engines)
G05440800Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location, 6-cylinder engines

Fig 4: Identifying Fluid Reservoir (8-Cylinder Engines)
G05440801Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location, 8-cylinder engines

Fig 5: Identifying Fluid Reservoir (12-Cylinder Engines)
G05440802Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location, 12-cylinder engines

Observation glass (arrow) on fluid reservoir clean.
Connector on coolant temperature sensor (B10/8) disconnect, bridge.
Engine idling.
Automatic climate control switch on, function "Defrost".
Bridge on connector for B10/8 remove, while observing
Observation glass (arrow) on fluid reservoir The refrigerant level should increase shortly after the electromagnetic clutch switches on and then flow through without bubbles (i.e. refrigerant no longer visible).
Connector reconnect to B10/8.
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