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Home >> Mercedes Benz >> 2017 >> GLS450 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electrical System - Engine - 166 Chassis >> Testing & Repair >> Remove/Install Coolant Temperature Sensor >> Remove/Install Coolant Temperature Sensor - AR15.60-P-2712GQ
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Remove/Install Coolant Temperature Sensor - AR15.60-P-2712GQ

Engine 276.8 in model 166, 292 

G14134441Courtesy of MERCEDES-BENZ USA
Fig 1: Coolant Temperature Sensor Components Location - Engine 276.8 In Model 166
G14134442Courtesy of MERCEDES-BENZ USA
DANGER 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
DANGER 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
REMOVINGINSTALLING Remove/install     
1 Remove lower engine cover   AR61.30-P-1001GQ
2 Drain off coolant   AR20.00-P-1142GQ
3 Detach battery ground line   AR54.10-P-0003GZ
4 Remove ME-SFI [ME] control unit   AR07.08-P-7008GQC
5 Remove left-hand air filter housing   AR09.10-P-1150GQC
6 Remove left soundproofing on injectors    
7 Detach coolant hose at bulkhead (4)   AR20.20-P-7441-01RQ
8 Unclip wiring harnesses (2) at bracket (3)    
9 Remove bracket (3) Bolt, control unit holder to cylinder head/cylinder head cover *BA07.08-P-1004-01A 
10 Remove center section of the bulkhead (4)    
11 Remove vacuum pump   AR43.05-P-1320EL
12 Open connector (8)   AR20.20-P-7441-01RQ
13 Remove screw/bolt, coolant pipe to guide tube TORQUE SPECIFICATION Bolt, coolant pipe to guide tube *BA20.10-P-1012-01AA 
14 Remove coolant line (10) together with coolant hose INSTALLATION IMPORTANT Replace sealing ring.  
15 Remove screws/bolts (11) TORQUE SPECIFICATION Bolt, heater feed to cylinder head *BA20.10-P-1006-01AA 
16 Remove coolant line (12) INSTALLATION IMPORTANT Install new sealing rings.  
17 Release and disconnect electrical connection (13)    
18 Release and disconnect coolant temperature sensor (14) INSTALLATION IMPORTANT Replace sealing ring.  
19 Install in the reverse order    
DANGER 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
20 Perform an engine test run and check engine cooling system for leaktightness    
CONTROL UNIT

Number Designation Engine 276
BA07.08-P-1004-01A Bolt, control unit holder to cylinder head/cylinder head cover Nm 9
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation Engine 276
BA20.10-P-1006-01AA Bolt, heater feed to cylinder head Nm 9
COOLANT PUMP, COOLANT THERMOSTAT

Number Designation Engine 276
BA20.10-P-1012-01AA Bolt, coolant pipe to guide tube M6 Nm 9