Removal & Installation

REMOVAL
1. Raise and support the vehicle. Take note of the location of the flexible section of the cabin heater exhaust tube.

NOTE: Have an approved fuel holding device ready to capture any diesel fuel that drains from the fuel line or cabin heater unit.

Cabin Heater Dosing Pump Fuel Line:

2. Remove clamps on dosing pump end of fuel line and separate line from the pump.
3. Remove clamp from the fuel line at the fuel tank connection and separate the line from the tank.
4. Remove any retaining clips and remove the fuel line from vehicle.

INSTALLATION

WARNING: DO NOT OPERATE THE DIESEL SUPPLEMENTAL CABIN HEATER IN AN ENCLOSED AREA SUCH AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS VENT THE CABIN HEATER EXHAUST WHEN OPERATING THE CABIN HEATER. ALLOW THE DIESEL SUPPLEMENTAL CABIN HEATER TO COOL BEFORE PERFORMING ANY SERVICE PROCEDURES TO THE CABIN HEATER. VERIFY THAT ALL DIESEL SUPPLEMENTAL CABIN HEATER FUEL LINES ARE SECURELY FASTENED TO THEIR RESPECTIVE COMPONENTS BEFORE PERFORMING ANY SERVICE PROCEDURES TO THE CABIN HEATER. FAILURE TO FOLLOW THESE WARNINGS MAY RESULT IN POSSIBLE PERSONAL INJURY OR DEATH.

NOTE: Verify that there is more than 1/8 of a tank of fuel in the vehicle's fuel tank before performing this procedure. Add fuel, if necessary.

1. Install the cabin heater fuel supply line into vehicle and fuel line retainers.
2. Install the fuel line connection at the fuel tank and tighten the connection securely.
3. Install the fuel line at the dosing pump and tighten the connection securely.
4. Lower the vehicle.

NOTE: Failure to prime the dosing pump after draining the supplemental cabin fuel line will prevent cabin heater activation during the first attempt to start the cabin heater. This will also set a diagnostic trouble code (DTC) in the cabin heater control's memory. Do not perform the Dosing Pump Priming procedure if an attempt was made to start the cabin heater without priming the dosing pump first. This will put excess fuel in the cabin heater and cause smoke to emit from the cabin heater exhaust pipe when cabin heater activation occurs.

5. Connect the DRBIII(R) scan tool to the diagnostic link connector.
6. Turn the ignition to the ON position.

NOTE:
- Do not activate the dosing pump prime more than one time. This will put excess fuel in the supplemental cabin heater and cause smoke to emit from the cabin heater exhaust pipe when cabin heater activation occurs.
- A clicking noise heard coming from the dosing pump indicates that the pump is operational.

7. With the DRBIII(R) scan tool in Cabin Heater, select System Tests and Dosing Pump Prime. Allow the dosing pump to run for the full 45 second cycle time. When the 45 second cycle is complete, press Page Back on the DRBIII(R) scan tool key pad to exit the Dosing Pump Prime. The Dosing Pump Priming procedure is now complete.