Heater Control Valve: Service and Repair

Coolant Shut-Off Valve (N82)

Special tools, testers and auxiliary items required

• Hose Clamps up to 25 mm Diameter (3094)

• Hose Clamp Pliers (VAS 6340)

Removing

- Remove the wheel housing liner.

- Remove the bolts - 4 - (8 +/- 0.9 Nm) and nut - 2 - (6 +/- 0.5 Nm).






- Remove the brackets - 1 - and - 3 - with the hoses downward in - direction of arrow -.

- Remove the bolt - 6 - (9 +/- 0.5 Nm) and clamp - 1 -.






The coolant system is under pressure when the engine is warm!

There is a risk of scalding from hot steam and coolant.

To reduce the pressure, cover the coolant reservoir cap with several cloths and then open it carefully.

- Loosen the clamps - 2 - and - 4 - and disconnect the coolant hoses from the coolant shut-off valve.

- Remove the coolant shut-off valve - 3 - from the bracket - 5 - in - direction of arrow -.

Installing

Install in reverse order of removal. Note the following:

• Secure the hose connections with clamps. For the correct clamp, refer to the Electronic Parts Catalog (ETKA).

• Make sure this part does not come in direct contact with the vehicle body or any other parts.

• The coolant flow direction is marked on the coolant shut-off valve.

• Be sure the coolant hoses are connected correctly to the coolant shut-off valve.

• Interchanged coolant hoses can result in failure of the passenger compartment heater due to the incorrect flow direction of the coolant.

• Coolant hoses that are bent cannot allow enough coolant to flow causing the passenger compartment heating to fail.

- Check the coolant level and bleed the coolant system.