Remove/install temperature sensor - AR15.60-P-3000GZS

ENGINE 156 in MODEL 164, 251 

Fig 1: Identifying Temperature Sensor Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning  caused by 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
	Risk of injury  caused by fingers being pinched or crushed  when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between the columns of the lifting platform and position the four support plates at the lifting platform support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Notes on avoiding damage to electronic components due to electrostatic discharge	All models	AH54.00-P-0001-01A
1	Switch ignition off, remove ignition key (transmitter key).	On vehicles with Keyless Go, code 889: Press Keyless Go start/stop button repeatedly until ignition is switched off. Remove keyless go transmitter card or transmitter key from vehicle and store outside of transmission range (min. 2 m)
2	Open engine hood	Model 164	AR88.40-P-1000GZ
		Model 251	AR88.40-P-1000RT
3	Remove the left and right intake air duct
4	Remove front engine cover	Do not tilt front engine cover, but lift upwards vertically otherwise the retaining lugs can break off.
5	Detach air hose (3) from air shutoff valves
6	Unclip air hose (3) on steering expansion reservoir (1) and place to one side
7	Remove switchover valve (2)		AR14.30-P-7255GZS
8	Detach steering expansion reservoir (1) and place to one side		AR46.25-P-1000GZS
9	Remove poly-V belt (4)
10	Remove guide pulley (5) from coolant pump		*BA13.25-P-1004-01U
11	Raise vehicle with lifting platform	Model 164	AR00.60-P-1000GZ
		Model 251	AR00.60-P-1000RT
12	Remove bottom engine compartment paneling	Only install lower engine compartment paneling after leak test.
		Model 164	AR61.20-P-1105GZ
		Model 251	AR61.20-P-1105RT
13	Drain coolant from radiator		AR20.00-P-1142GZS
	Notes on coolant	All engines	AH20.00-N-2080-01A
		Coolant	*BF20.00-P-1001-02U
14	Unlock and disconnect electrical connector (6) on coolant temperature sensor (B11/4)
15	Remove coolant temperature sensor (B11/4) from cylinder head	Replace sealing ring.
			*BA15.60-P-1002-01C
16	Install in the reverse order
17	Pour in coolant and bleed cooling system		AR20.00-P-1142GZS
18	Conduct engine test run and check the engine for leaks

TEMPERATURE SENSOR

Number	Designation		Engine 156, 159
BA15.60-P-1002-01C	Coolant temperature sensor on cylinder head	Nm	21

BELT TENSIONING DEVICE

Number	Designation		Engine 156, 159
BA13.25-P-1004-01U	Guide pulley on coolant pump housing (between alternator and smooth guide pulley)	Nm	20

COOLING SYSTEM

Number	Designation			Engine 156 in model 164, 251
BF20.00-P-1001-02U	Cooling system	Total filling capacity	≈Liters	7.5
		Antifreeze/water	Up to -37°C	50/50
			Up to -45°C	55/45
		Specifications for Operating Fluids	Specification	Coolant (Specification 310.1)
			Specification	Anticorrosion/antifreeze agents (Specification 325.0)