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Remove/install coolant temperature sensor - AR15.60-P-2711MMI

ENGINES 152.9 in MODEL 172.4 

Fig 1: Identifying Coolant Temperature Sensor Remove/Install Components
G10247876Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Drain coolant   AR20.00-P-1142W
NOTES Notes on coolant   AH20.00-N-2080-01A
2 Remove air filter housing   AR09.10-P-1150MMI
3 Remove soundproofing on left cylinder head cover    
4 Disconnect electrical connection on crankshaft Hall sensor   AR15.12-P-2136MMI 
5 Disconnect electrical connectors at coolant temperature sensor (B11/4)    
6 Detach coolant temperature sensor (B11/4) at cylinder head; to do this remove screw/bolt (1s) and remove bracket (1) INSTALLATION IMPORTANT Replace seal ring.  
7 Install in the reverse order    
INSPECT Checking     
8 Inspect cooling system for leaks   AR20.00-P-1010W
DANGER Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.
AS00.00-Z-0005-01A
9 Conduct engine test run and check engine for leaks