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Mods: Heating things up
The Defender unit differs significantly from the original SIII
heater, though they are very similar in operation. Both
In this article Nick (Snagger) addresses
have a two-speed electrically powered blower motor that
the rather poor, and by now tired, cab
forces external air through the heater matrix, where it is
heater fitted to the Series III at the fac-
warmed to a selected temperature by an engine coolant
tory. Defender heater units are vastly
heat exchanger, and then exits the heater matrix housing
superior to the SIII units, and are an up-
through a hole in the bulkhead. Once through the bulk-
grade that should be high on most peo-
head, it enters the lower fascia assembly, which acts as a
ples’ list, especially with winter
low pressure duct. This duct has two upper vent holes that
lead to the windscreen demisters and two lower vents for
the foot wells. A cable operated torque rod with vent flaps inside the fascia blocks airflow through the
unwanted vents to control the proportion of air used for demisting and cab heating.
The differences in the equipment are:
Location of the intake – side of the passenger wing on SIII, wing top on Defender
Separate blower and matrix housings on SIII, combined unit on Defender
Two positive feeds from switch on SIII, one positive motor feed and two switched earths on Defender
Temperature controlled by water control valve on SIII (front of cylinder head), air bypass flap on De-
Fitting the Defender unit to a SIII is pretty simple. First, remove the SIII heater matrix housing, blower
motor and ducting.
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