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:

Install gaiter (3) dry and free from grease.

Fitting on turbocharger must be dry and free from grease.

Fig 1: Removing Intake Pipe

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and detach plugs (1 and 3).

Unlock and disconnect line (2).

Carefully pull cable duct (4) upwards slightly.

Fig 2: Pulling Cable Duct Upwards

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

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

Installation:

Replace sealing ring
IF NECESSARY, ADD COOLANT
CHECK COOLING SYSTEM FOR WATER LEAKS

Fig 3: Removing Coolant Temperature Sensor
Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Now clear the fault memory.