Frelander 2. Manual — part 435

Auxiliary Climate Control -

Torque Specifications

Description

Nm

lb-ft

Electric booster heater Torx screws

2

1

Fuel fired booster heater bolts

10

7

Feul fired booster heater fuel pump bolts

10

7

Auxiliary Climate Control - Electric Booster Heater

Description and Operation

COMPONENT LOCATION

Item

Part Number

Description

1

-

Heater assembly

2

-

Electric booster heater

OVERVIEW

Due to the slower warm up times associated with the diesel engine, an electric booster heater may be fitted to increase
heater performance. The electric booster heater does this by heating the air leaving the heater assembly.

The electric booster heater comprises ceramic coated thermistor elements and a microcontroller. A request for electric
booster heater operation originates in the Automatic Temperature Control (ATC) module. This request is transmitted to the
Central Junction Box (CJB) over the medium speed Controller Area Network (CAN) bus. The CJB interprets this request and
outputs a Pulse W idth Modulation (PW M) signal to the electric booster heater microcontroller. The duration of the pulses
provided by the CJB is proportional to the amount of heating required.

The amount of heating requested by the ATC is based on:

Ambient air temperature
Engine Coolant Temperature (ECT)
Heating request.

• NOTE: There is also a minimum blower motor speed required electric booster heater operation.

The electric booster heater is limited to 1.25 kW. If electrical load management is in force, electric booster heater
performance will be reduced.

• NOTE: Vehicles fitted with an electric booster heater and heated windshield will also be fitted with an uprated 180 amp
generator.
For additional information, refer to:

Generator - TD4 2.2L Diesel

(414-02 Generator and Regulator, Description and

Operation).

Auxiliary Climate Control - Fuel Fired Booster Heater

Description and Operation

COMPONENT LOCATION - VEHICLES WITHOUT FFBH REMOTE CONTROL

Item

Part Number

Description

1

-

Automatic Temperature Control (ATC) module

2

-

Fuel Fired Booster Heater (FFBH)

3

-

Auxiliary coolant pump

4

-

Ambient air temperature sensor

5

-

Auxiliary fuel pump

COMPONENT LOCATION - VEHICLES FROM 2009MY WITH FFBH REMOTE CONTROL