Heating and Ventilation System

Description
The heating and ventilation system is standard on all models. Air conditioning is an optional system which provides fully integrated climate control for the vehicle interior.

The heater assembly, comprising a matrix housed in a distribution unit and a variable speed blower motor, is located on one side of the engine compartment and attached directly to the fascia bulkhead.

The heating controls are positioned on the outside of the instrument binnacle and cable linked to mechanical flaps in the distribution unit.

Heater Assembly:

1. Heater distribution unit
2. Fixings, heater to fascia bulkhead
3. Heater matrix
4. Blower motor housing
5. Circlip, impeller to blower motor
6. Impeller
7. Resistor unit and harness connector
8. Fixings, blower motor mounting plate
9. Mounting plate, blower motor
10. Blower motor
11. Fixings, blower motor to mounting bracket
12. Temperature flap, air flow to heater matrix
13. Air flap, air supply to plenum chamber (heater duct)

Operation
The heater matrix, located in the distribution unit, is connected to the engine cooling system. As coolant is circulated continuously through the matrix, a selection of heated or ambient air is controlled by two flaps within the distribution unit.The temperature flap controls the amount of ambient air to the heater matrix, air being supplied through a ducted vent on top of the vehicle front wing to the blower motor (volute) housing.

The blower motor can be used to boost the air flow into the distribution unit. The air flap controls the supply of heated or ambient air from the heater unit into a plenum chamber integeral with the vehicle fascia. Two flaps in the plenum chamber (heater duct) distribute the air flow to either the footwell vents or windscreen demister vents.

Non Air Conditioning Fascia Shown:

Heater Controls
1. Temperature control
Move the lever downwards to increase air temperature or up to decrease air temperature.
2. Air distribution control
Lever fully up - windscreen vents only. Lever midway - footwell and windscreen vents. Lever fully down - footwell vents.
3. Blower motor fan speed control
Move the lever progressively downwards to increase fan speed. With the control at 'O' the fan is switched off and the volume of air entering the passenger compartment is solely dependent on ram effect when the vehicle is moving forward.

Fresh air vents
Two fresh air vents are fitted in the windscreen frame and are controlled independently of the vehicle heating system. Each vent is operated separately.

Fresh Air Vents:

To open a vent, push the lever to the right and then to the required position.