A vacuum-controlled heater is fitted in the Mondeo '97 as in the models of previous years. The air distribution vents are operated by vacuum diaphragm units. To avoid confusion, vacuum hoses running from the air distribution switch to the vacuum diaphragm units are colored. Temperature control by means of a Bowden cable is provided only on vehicles without air conditioning (A/C).
The heater housing only differs from the heater/air conditioning housing in that no evaporator is fitted.
The incoming stream of fresh air is passed though a pollen filter and is thereby cleaned of pollen and dirt particles.
1
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Vacuum system reservoir
3
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Vacuum diaphragm unit/actuator - recirculation air flap
5
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Air conditioning evaporator
7
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Heater/evaporator housing
9
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Vacuum diaphragm unit/actuator - floor level air vents
10
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Vacuum diaphragm unit/actuator - demister nozzles
12
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Outlet - floor level ventilation
13
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Connector - vacuum distribution
Air distribution control switch
Face level
The main air flow is directed at face level, and a small part is directed to the defroster nozzles on the side windows.
Face level/floor level
The main flow of air enters the passenger compartment in equal parts at face level and floor level, and a small amount flows to the demister nozzles of the side windows.
OFF
In the OFF position the blower motor is completely switched off. The air inlet flap is closed.
Floor level
The main flow of air enters the passenger compartment at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist/floor level
The main flow of air enters the passenger compartment in equal parts at the windscreen and at floor level, and a smaller amount flows to the demister nozzles of the side windows.
Demist
The main flow of air enters the passenger compartment at the windscreen and a smaller amount flows to the demister nozzles of the side windows.
Air distribution control switch
Vacuum diaphragm unit/actuator
The air distribution switch acts on the vacuum diaphragm units/actuators.
It is connected to the vacuum system reservoir by a hose.
If a vacuum is applied to the vacuum connection of the vacuum diaphragm unit/actuator, the diaphragm and the connecting rod fixed to it are withdrawn. The recirculation air flap fixed to the extension of the connecting rod is opened.
The air distribution flap remains in position "0" while the vacuum in the actuator is maintained. If there is a leak in the actuator or anywhere else in the system this will cause the recirculation flap to gradually close.
Vacuum diaphragm unit/actuator
