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Home >> Mercedes Benz >> 2017 >> GLC300 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electrical System - Engine - 253 Chassis >> Testing & Repair >> Remove/Install Coolant Temperature Sensor >> Remove/Install Coolant Temperature Sensor - AR15.60-P-2712MNG
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Remove/Install Coolant Temperature Sensor - AR15.60-P-2712MNG

Engine 177 in model 253 

Fig 1: Coolant Temperature Sensor (B11/4) Components Location - Engine 177 in Model 253
G12817212Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury  to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning  from swallowing coolant. Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. AS20.00-Z-0001-01A
WARNING Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
CAUTION Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels. AS00.00-Z-0017-01A
  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
  Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
  Notes on coolant   AH20.00-N-2080-01A
REMOVINGINSTALLING Remove/install     
1 Drain off coolant INSTALLATION IMPORTANT Install center and front engine compartment lining only after leak test has been performed AR20.00-P-1142MNG
2 Remove left-hand air filter housing   AR09.10-P-1151MNG
3 Remove boot (1) from exhaust gas turbocharger and place to one side TORQUE SPECIFICATION Clamp boot to exhaust gas turbocharger/air filter *BA01.20-P-1003-01J 
4 Close opening of exhaust gas turbocharger with    
5 Release and disconnect electrical connector of coolant temperature sensor (B11/4)    
6 Remove screw/bolt (2) TORQUE SPECIFICATION Bolt temperature sensor bracket to crankcase *BA07.04-P-1002-01Q 
7 Remove coolant temperature sensor (B11/4) INSTALLATION IMPORTANT Replace seal.  
8 Remove retaining plate (3) from coolant temperature sensor (B11/4) When replacing the coolant temperature sensor (B11/4).  
9 Install in the reverse order    
WARNING Risk of accident  from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. AS00.00-Z-0005-01A
10 Perform an engine test run and check engine for proper function    
11 Install center and front lower engine compartment paneling   AR61.20-P-1105LW
CRANKCASE VENTILATION SYSTEM, CYLINDER HEAD COVER

Number Designation Engine 177
BA01.20-P-1003-01J Clamp, boot to exhaust gas turbocharger/air filter Nm 1, 5
SENSORS

Number Designation Engine 177
BA07.04-P-1002-01Q Bolt, temperature sensor bracket to crankcase Nm 9