- Drain coolant.
See Group 00.
- Disconnect coolant hose from thermostat.
![](https://motoinstruction.ru/img/bmw/21/127236.jpg)
- Remove retaining clip (7).
- Pry out cover (5) at projection.
- Remove thermocouple (4).
- Check O-ring (6) for damage.
- Installation is the reverse of the removal procedure: pay particular attention to the following.
Note: Chill cover (5) prior to installation in refrigerator/freezer, or similar.