Rear A/C System
General Description:
Models 126.023, 126.033 and 126.037 with partition can be optionally provided since 03/82 with an air-conditioning system for the rear passenger compartment.
The refrigerant circuit for cooling the rear passenger compartment is connected in parallel (arrow) with existing air-conditioning system. Function and effect are similar to the air-conditioning system known up to now.
The refrigerant supply to the evaporators, which are not dependent on each other, is controlled by two R 12 magnetic valves at the left in engine compartment.
The rear passenger compartment air-conditioning system is switched on and off at magnetic valve (37).
The entire filling capacity amounts to 1700 g refrigerant R 12.
View of partition
28 Air flow regulator
32 Temperature regulator
Fresh air is routed to rear passenger compartment through two channels under center console. When the air flow regulator (28) is switched on, the fresh air supply to rear passenger compartment is electronically and steplessly controlled by way of the electromagnetic switchover valve (27).
Engaged at "MAX" means full, uncontrolled blower speed.
Layout of switchover valve for fresh air to rear passenger compartment on air-conditioning cabinet, front
The vacuum element (35) opens and closes the fresh air channels to rear passenger compartment depending on activation of switchover valve (27).
The air supply is routed via rear passenger compartment evaporator through partition to bar compartment supported by blower (30).
Layout of rear passenger compartment evaporator with blower and expansion valve between front seats.
Layout of vent hole to bar compartment (arrow)
98 Condensate water drain hose from bar compartment
From bar compartment, the fresh air or the cooled air is distributed to the air outlets (left, center, right) by means of swivelling inserts (arrows).
Fresh air sucked in at the front ii mixed with circulating air from rear passenger compartment for better exploitation of cooling capacity.
The temperature is adjusted with selector dial (32).
The air is sucked from rear passenger compartment through air channels (arrow), located at the left and right of cardan tunnel below between the front seats.
Layout of refrigerant lines (arrows) from and to evaporator for rear passenger compartment on driver's side:
Suction line from evaporator for rear passenger compartment
Installation of suction and pressure line for rear passenger compartment evaporator
Line connections in driver's legroom (arrows)
The air-conditioning system for rear passenger compartment is protected by separate fuses.
Layout of auxiliary fuse assembly (5a) for rear passenger compartment blower in main fuse box
Layout of relay on partition behind driver's seat backrest
31 Double contact relay far rear passenger compartment blower
34 Double contact relay for standard evaporator
35 Double contact relay for evaporator, rear passenger compartment
The six-point coupler (arrow) for auxiliary harness to rear passenger compartment blower is on partition also behind driver's seat backrest. The temperature sensor for evaporator of rear passenger compartment is connected to double coupling (38).
30 Rear passenger compartment blower
36 Double coupling, temperature sensor
30 Rear passenger compartment blower with electric connection