Ford Festiva. Instruction — part 88

Fig. 2: Identifying A/C-Heater Air Distribution Components

Courtesy of FORD MOTOR CO.

OPERATION

A/C-HEATER CONTROL PANEL

The A/C-heater panel is located in the center of instrument panel above the radio. Air discharge outlets are located above, below, in center
and on both sides of instrument panel. The climate control panel consists of 3 slide levers, one A/C on-off push button and a rotary blower
switch.

The lower slide lever is used to control temperature. Sliding lever from far left side (cool) to far right side (warm) increases interior
temperature. The middle slide lever selects fresh air from outside or recirculated air from inside. The upper slide lever controls air delivery
mode. A/C push-button on-off switch activates air conditioning system.

THERMOSTATIC SWITCH

With A/C system operating, thermostatic switch determines A/C compressor clutch on-time. Control is accomplished by a cable attached
between the temperature blend lever and thermostatic switch. The thermostatic switch sensing tube is installed into (or near) evaporator fins.

Switch is wired in series with A/C relay and Electronic Control Assembly (ECA). The ECA calculates compressor on-time based on A/C relay
signals. This controls evaporator temperature to regulate cool air entering vehicle.

THERMOSTATIC EXPANSION VALVE

The Thermostatic Expansion Valve (TXV) is a controlling device metering liquid refrigerant from high pressure line into evaporator. It also
provides for complete vaporization of all refrigerant entering evaporator.

The high refrigerant pressure is reduced before entering evaporator by a ball valve within TXV. Depending on pressure applied to TXV
diaphragm from both sides of system, TXV allows more or less high pressure refrigerant to be discharged through its orifice into evaporator.
See

Fig. 3

.

Fig. 3: Cross-Sectional View of Thermostatic Expansion Valve

Courtesy of FORD MOTOR CO.

ADJUSTMENTS

TEMPERATURE CONTROL CABLE

Temperature control cable is located at left base of evaporator housing. See

Fig. 4

. Release cable retaining clip. Position temperature control

knob in maximum cool position. While holding thermostat cable in maximum cool position, secure cable casing using retaining clip.

Fig. 4: Adjusting Temperature Control Cable

Courtesy of FORD MOTOR CO.

RECIRCULATED/FRESH AIR DOOR CABLE

Remove glove box retaining screws and glove box. Release cable retaining clip. See

Fig. 5

. Move control knob to recirculation position. Hold

door lever in recirculation position, and secure cable casing using retaining clip. Install glove box.

Fig. 5: Adjusting Recirculated/Fresh Air Door Cable

Courtesy of FORD MOTOR CO.

MODE SELECTOR CABLE

1. Remove air distribution plenum and instrument panel brace. See

AIR DISTRIBUTION PLENUM

under REMOVAL &

INSTALLATION. Release cable retaining clip. See

Fig. 6

.

2. Move control knob to vent position. While holding lever downward against stop, secure cable using retaining clip.
3. Disconnect defrost door link at defrost door lever. While holding defrost door upward against its stop, adjust defrost door link to a free

fit in defrost door lever. Install air distribution duct. Install instrument panel brace.

Fig. 6: Adjusting Mode Select Cable

Courtesy of FORD MOTOR CO.

TROUBLE SHOOTING

COMPRESSOR CLUTCH TROUBLE CHARTS

Fig. 7: Compressor Clutch Trouble Chart CC1

Courtesy of FORD MOTOR CO.

NOTE:

Use the following trouble shooting charts to diagnose air conditioning system problems.