Coolant Temperature Sensor/Switch (For Computer): Service and Repair

12 62 500 - Replacing coolant temperature sensor (N14)





Warning!
Danger of scalding!
Only carry out work on the cooling system after the engine has cooled down!





Important!
Gaiter and charge-air hoses with clamp fastenings must be installed dry and free from grease!
Sealing faces and fittings must be dry and free from grease.
If gaiter and charge-air hoses with clamp fastenings are not installed dry and free from grease, this may result in turbocharger failure!





Necessary preliminary tasks:
- Read out fault memory of DME control unit

- Check stored fault messages

- Switch off ignition





Installation location:
On cylinder head, left.
Coolant can escape when coolant temperature sensor is being replaced. Catch and dispose of coolant.





Release clamps (2).
Remove rubber gaiter (3).
Remove intake pipe (4).

Installation Note:
Install gaiter (3) dry and free from grease.
Fitting on turbocharger must be dry and free from grease.





Unlock and detach plugs (1 and 3).
Unlock and disconnect line (2).
Carefully pull cable duct (4) upwards slightly.





Unlock plug (1) and remove.
Detach lock (2) and remove coolant temperature sensor (3).

Installation Note:
- Replace sealing ring

- If necessary, add coolant 17 00 039 Venting Cooling System and Checking For Water Leaks

- Check cooling system for water leaks 17 00 009 Checking Cooling System For Water Leaks





Note:
Now clear the fault memory.