A/C - Modified Evap. Switch & In Car Temp Sensor Info.

85mercedes02
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS


DATE: April 1985 REF. NO. 83/49

SUBJECT: A. MODIFIED EVAPORATOR TEMPERATURE REGULATOR (ETR) SWITCH MODELS 107 AND 126 WITH ACC
B. ASPIRATOR BLOWER FOR IN-CAR TEMPERATURE SENSOR MODEL 126 WITH SLIDING ROOF


A. Modified Evaporator Temperature Regulator (ETR) Switch Models 107 and 126 with ACC

Since September 1984 production, a modified evaporator temperature regulator (ETR) switch is installed.

The previous ETR switch should be replaced in case of the evaporator freezing up or the following:

- the electromagnetic clutch (A/C compressor) cycles repeatedly and in quick succession when the cut-out temperature is reached or

- the electromagnetic clutch surfaces are burned out.

If the electromagnetic clutch burns out, the compressor, the receiver-drier and the expansion valve must be replaced.

When replacing a seized or hard-turning A/C compressor, the refrigerant lines on the compressor must also be replaced as described in S.I. 83/36b.

Fill system with the modified capacity charge of R12 refrigerant, regardless of the radiator support decal listing or model year.

Capacities


Model R12 refrigerant, kg (lb.)


107 1.0 (2.2)
126 1.3 (2.9)
Parts Information


Part Name Part Number Applicable to


ETR switch 002 820 83 10 model 126
003 820 23 10 model 107

Figure 1 - Vehicle without sliding roof 47 Air jet nozzle:

NOTE: In vehicles without the sliding roof, the air jet nozzle (47) is still installed (Figure 1).

Figure 2 - Vehicle with sliding roof 31 Aspirator blower:

B. Aspirator Blower for In-Car Temperature Sensor. Model 126 with Sliding Roof

Since mid-July 1984 production, an aspirator blower (31) is installed in 126 models with the sliding roof option. The aspirator blower ventilates the in-car temperature sensor, allowing the climate control system to maintain constant temperatures even with the sliding roof open (Figure 2).
Production Phase-In

Model As of chassis end number

126 A 085947
The aspirator blower is connected to fuse no. 10 (circuit 15) and to ground with a separate wiring harness and is switched on by the ignition.

Figure 2 - Vehicle with sliding roof 31 Aspirator blower:

In case of complaints for minor noise, insert a felt or foam shim (5 mm thick) under the blower (arrow) and only lightly tighten mounting screws (Figure 2). For louder noises, replace the aspirator blower.
Parts Information


Part Name Part Number

Aspirator blower 000 830 61 08