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Evaporator Air Temperature Replacement
 
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Pelican Technical Article:

Evaporator Air Temperature Replacement

Steve Vernon

Time:

4 hours4 hrs

Tab:

$150

Talent:

**

Tools:

Angles long nose pliers

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New evaporator air temperature sensor

Hot Tip:

Do not drop the connection piece

Performance Gain:

Proper functioning A/C

Complementary Modification:

New cabin air filters

There are three air temperature sensors on the car: one for the engine air intake, one for the climate control system and one that shows the outside air temperature in the dash. This article deals with the evaporator air temperature for the A/C system.

The evaporator temperature sensor is not easy or quick to replace. You will need to remove the mono-post wiper motor before you can replace the sensor. Please see our article on mono-post wiper motor replacement. The job is easier if you have a model that has a glove box as the wiring for the sensor connects behind the glove box. If you have an air bag you can replace the sensor without removing the air bag if you have a set of long nosed angle pliers and some patience.

The evaporator air temperature sensor is located on the right side of the mono-post wiper below the plastic cowl pieces.
Figure 1

The evaporator air temperature sensor is located on the right side of the mono-post wiper below the plastic cowl pieces. Please see our article on removing the wiper motor and perform the work on that article first.

With the cowl and wiper motor and assembly removed you can see the sensor (yellow arrow) on the right side above the cabin air filters (red arrow).
Figure 2

With the cowl and wiper motor and assembly removed you can see the sensor (yellow arrow) on the right side above the cabin air filters (red arrow).

The sensor pulls straight back and out from its mount.
Figure 3

The sensor pulls straight back and out from its mount. With the exception of physical damage there is no way to tell whether the sensor is functioning by just looking at it (red arrow).

The sensor's wiring passes through the firewall into the interior (red arrow) through a large rubber grommet.
Figure 4

The sensor's wiring passes through the firewall into the interior (red arrow) through a large rubber grommet. Pull this grommet out to give you access to pass the wiring through. If you have a glove box you can simply remove the glove box and separate the connection.

If you have an air bag in place of the glove box it is possible to gently pull the wiring up enough until you can grab the connection with a set of needle nosed angle pliers through the hole (yellow arrow).
Figure 5

If you have an air bag in place of the glove box it is possible to gently pull the wiring up enough until you can grab the connection with a set of needle nosed angle pliers through the hole (yellow arrow). Carefully hold the connection and insert the new wiring through the grommet and connect it (red arrow). If you drop the connection down behind the dash you will need to remove the air bag to get access to it so take your time and do it right. Installation is the reverse of removal.

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Comments and Suggestions:
Nukta Comments: Do you have a part number for this sensor? I know there's a sensor that goes inside the evaporator box but can't seem to find the part number for this exterior one. Thanks!
June 9, 2015
  Followup from the Pelican Staff: I’m not the best with part numbers.

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