412-02-2 Heating and Ventilation 412-02-2
DESCRIPTION AND OPERATION
E1243 EN 07/2001 2002 Bantam
Heating and Ventilation
The heater temperature is set using the
temperature control switch. Depending on the
setting of this switch, the heater control module
(located in the heater/air conditioning system
controls) monitors the position of the heater
control valve, which in turn controls the flow of
hot coolant through the heat exchanger.
A splined shaft adjusts the position of the air
distribution flap. A control motor operates the
recirculated air flap.
The blower motor has four speeds, controlled by
the blower motor operating switch through a
resistance.
If the air conditioning system is switched on but
the blower motor switch is off, the air conditioning
system will not operate. The air conditioning
system will only operate if the blower motor is on.
Procedure if there is regular knocking noises
coming from the fascia crash padding area.
The water flow through the heater control valve
can cause a regular knocking noise when the
operating temperature switch is set between Min
and Max. This noise is carried into the interior of
the vehicle via the fascia /crash padding and can
be intensified if any air is trapped in the system. If
concerns are expressed over this, the noise can
be reduced by installing modified insulation on
the heater control valve along with a modified
heater coolant hose. For additional information,
refer to Heater Control Valve in this section
Procedure if the heating cannot be controlled.
If there is a concern that the heating cannot be
controlled (only hot air or only cold air is
produced), the cause may be a damaged wiring
harness, damaged multiplug, a defective heater
control valve or a defective heater control. To
resolve the concern, check the heating system
and renew any damaged components. An
additional cover should be installed on the heater
control valve on the vehicle. For additional
information,
refer to Section 412-00 Diagnosis and Testing
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