DESCRIPTION AND OPERATION
4.62 RANGE ROVER
FUEL BURNING HEATER – V8
DESCRIPTION
General
The Fuel Burning Heater (FBH) is mounted in the rear of the engine compartment on the
passengers side, and is fitted as an option on V8 vehicles. The FBH is an additional heater
installed in the heater coolant circuit. The FBH can be operated without the engine running
to pre-heat the passenger compartment and after the engine starts to reduce heater coolant
warm-up time. The FBH also boosts the heater coolant temperature while the engine is
running at low ambient air and engine coolant temperatures to maintain heater performance
at an acceptable level.
For a detailed description of FBH operation, refer to the Air Conditioning section of the
System Description and Operation Workshop Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 59 of the passenger
compartment fuse box (C0632) on an R wire. Fuse 59 (C0582) provides a constant battery
feed to the FBH (C0925) and the FBH receiver (C2046) on a pair of RY wires. The FBH
(C0925) is earthed on an N wire, FBH receiver (C2046) on an NB wire.
FBH Receiver
A remote request for park heating is received by the TV antenna located in the RH rear
window. This is relayed to the FBH receiver (C2229) by the antenna amplifier (C2228) on an
R wire. The FBH receiver (C2046) then provides a feed to the FBH (C0926) on a WG wire
informing the FBH to operate the park heating function.
FBH Pump
The FBH pump is mounted below the RH side of the fuel tank. The FBH (C0926) provides
a Pulse Width Modulated (PWM) signal to the pump (C0920) on a BR wire. The pump is
earthed on an N wire.
Changeover Valve
The changeover valve isolates the heater coolant circuit from the engine coolant circuit. The
changeover valve is a normally open solenoid. To close the valve, the ATC ECU (C1629)
provides a feed to the valve (C2037) on an SB wire. The valve is earthed (C2037) on an NB
wire.
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