Auxiliary Cabin Heater Exhaust Pipe: Service and Repair

Fuel Fired Booster Heater Exhaust Pipe

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Removing components





Remove:
- the EVAP canister hose (1) from the intake manifold
- the intake manifold (2) between the air cleaner (ACL) and the turbocharger (TC).

Remove:
- the hose clamps at the mass air flow (MAF) sensor
- the hose clamps at the turbocharger (TC)
- the screws for the intake manifold in the cylinder head.

Removal

Removing the exhaust pipe for the engine coolant heater




Pull off the intake hose that covers the upper mounting for the exhaust system.
Move the intake hose to one side.
Disconnect the upper mounting (as illustrated). Remove the screw.




Raise the vehicle.

Remove:
- the right-hand front wheel
- the shield under the vehicle. It is secured with 7 clips.
Disconnect the water pump. See: Water pump, fuel-driven auxiliary heater, B5254T7, L.H.D Water Pump, Fuel-Driven Auxiliary Heater. Leave the water pump hanging from its hoses.




Remove the fuel hose/pipe from the exhaust pipe for the engine coolant heater at the quick-release connector under the vehicle.




Disconnect the lower mounting under the engine. Use a long extension rod. See the illustration.
Pull the exhaust pipe down through the right-hand wheel arch.

Installation

Installing the exhaust pipe for the engine coolant heater
Position the exhaust pipe. Carry out the work from the right-hand wheel arch.
Screw the nut into place loosely on the lower mounting. Do not tighten yet.
Install the fuel hose/pipe at the quick-release connector under the vehicle.
Secure the upper mounting. Tighten. See: Tightening torque [1][2]Body and Frame.
Position the intake hose.

Install:
- the screws for the intake manifold in the cylinder head
- the hose clamps at the turbocharger (TC)
- the hose clamps at the mass air flow (MAF) sensor
- the intake manifold between the air cleaner (ACL) and the turbocharger (TC)
- the hose for the EVAP canister from the intake manifold.

Finishing

Installing components and testing the engine coolant heater





Install:
- the right-hand front wheel
- the lower mounting on the nut for the exhaust system. Tighten. See: Tightening torque [1][2]Body and Frame
- the shield under the vehicle using the 7 clips.
Carry out a performance test of the engine coolant heater. See: Fuel-powered preheater, checking Fuel-Powered Preheater, Checking.