Remove/install coolant temperature sensor on electric coolant pump of high-voltage battery cooling system

AR08.50-S-0025F

Remove/install coolant temperature sensor on electric coolant pump of high-voltage battery cooling system

20.02.2020

Engine

780.701/702 in model 447

Modification notes

19.02.2020

Method extended

Operation step 2

Shown on engine 780.701

1

Coolant temperature sensor

3

Catch spring

2

Electrical connector

4

Connection fitting

1

Coolant temperature sensor

5

O-ring

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

 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

 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

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment

AH00.00-Z-0300-01A

 

Remove/install

1

Drain coolant for high-voltage battery cooling system.

Engine 780.701 in model 447

AR08.50-S-0021F

Engine 780.702 in model 447

AR08.50-S-0022G

 Engine 780.702 in model 447
Installation: Only install engine compartment lining after leak test.

2

Remove connection fitting (4) from the electric coolant pump.

Engine 780.702 in model 447

AR20.20-P-7441-01RQ

 Collect escaping coolant.
Seal opening on the electric coolant pump.

 Commercially available devices/tools
Collecting pan

 Set of protective covers

*001589019100

3

Release and disconnect the electrical connector (2).

4

Remove catch spring (3).

5

Remove coolant temperature sensor (1) from the connection fitting (4).

 Collect escaping coolant.
Seal off opening.

 Commercially available devices/tools
Collecting pan

 Record plug

*129589009100



Check

6

Check coolant temperature sensor (1) and O-ring (5) for damage.

If damage is present,



Replace coolant temperature sensor (1).

7

Install in the reverse order.



Check

8

Check high-voltage battery cooling system in the area of the coolant temperature sensor (1) for leak tightness.

AR08.50-S-0011F