Transmission Temperature Sensor/Switch: Service and Repair

Removing and installing ATF thermostat








Tools

Removing ATF thermostat
1. Remove engine guard.
^ The following three points also apply to the V8 Biturbo engine variant:





^ Disconnect the connection on the charge air cooler. To do this, remove locking clip -1- and pull off the line.
^ Disconnect lead of the ambient air valve module -2- . To do this, remove the spring band clamp and pull off the line.





^ Disconnect suction line from engine. To do this, remove locking clip and pull off the line.
2. Place oil collecting container underneath the vehicle.





3. Undo ATF line screw connection on cooler side at the thermostat.





4. Unscrew fastening screw which fastens ATF line to the thermostat





5. Unscrew fastening screw which fastens ATF thermostat to the cooler.

Note:
^ In order to prevent the distribution of oil in the area of the front of the vehicle, a discharge chute should be held in position.





6. Hold shop-made tool discharge chute under the ATF thermostat.
7. Disconnect ATF lines from the thermostat and drain off ATF.
8. Remove thermostat.

Installing ATF thermostat

Note: The sealing rings at the ends of the ATF lines on the transmission and the cooler sides must be replaced before installation.

1. Replace sealing rings on the ATF lines and coat with ATF.
2. Connect transmission-side ATF lines to thermostat. Insert the upper line first.
3. Insert ATF cooler lines.





4. Tighten fastening screw which fastens ATF thermostat to the cooler.
Tightening torque: 3.5 Nm (2.5 ft. lbs.)





5. Tighten fastening screw which fastens ATF line to the thermostat.
Tightening torque: 10 Nm (7.5 ft. lbs.)

Note: Counter when fastening the ATF lines.





6. Tighten ATF line screw connection on cooler side at the thermostat.
Tightening torque: 30 Nm (22 ft. lbs.)
^ The following three points also apply to the V8 Biturbo engine variant:





^ Connect suction line to engine. To do so, insert locking clip and push line on until it engages.





^ Connect lead of the ambient air valve module -2. To do so, fit the spring band clamp and connect lead.
^ Insert locking clip -1- on charge air cooler suction line and push line on until it engages.





7. Unscrew ATF control screw -A- and fill in ATF until a constant discharge is visible at the lifting tube.
8. Check ATF.
9. Install engine guard.





Tightening torques