Ford Festiva. Instruction — part 2

2. Lift access plate and disconnect sending unit wiring. To relieve fuel pressure, start engine and run it until engine stalls. Turn ignition off.

Disconnect and plug fuel lines at sending unit. Remove sending unit attaching screws. Remove sending unit. To install, reverse removal
procedure.

TACHOMETER

Removal & Installation

Remove instrument panel. See

INSTRUMENT PANEL

under REMOVAL & INSTALLATION. Disassemble panel and remove tachometer.

To install tachometer, reverse removal procedure. On Capri, the tachometer/speedometer/boost gauge assembly must be replaced as an
assembly.

TEMPERATURE GAUGE

Removal & Installation

Remove instrument panel. See

INSTRUMENT PANEL

under REMOVAL & INSTALLATION. Disassemble panel and remove temperature

gauge. To install gauge, reverse removal procedure. On Capri, the temperature/oil pressure gauge assembly must be replaced as an assembly.

TEMPERATURE SENDING UNIT

Removal

Disconnect sending unit wire, located on side of block below thermostat housing (Festiva) or cylinder head (Capri). Remove radiator cap to
relieve cooling system pressure. Position drain pan below sending unit. Remove temperature sending unit.

Installation

To install, apply Pipe Sealant With Teflon (D8AZ-19554-A) to threads of sending unit. Reverse removal procedure to complete installation.
Fill cooling system to proper level. Start engine and check for coolant leaks at sending unit.

WIRING DIAGRAMS

CAUTION:

Tachometer is calibrated at factory. Rough handling could disturb calibration.

NOTE:

Refer to the appropriate WIRING DIAGRAMS article in the WIRING DIAGRAMS section.

Copyright 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.

Article GUID: A00028301

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DEFOGGER - REAR WINDOW

1991 ACCESSORIES & SAFETY EQUIPMENT Rear Window Defoggers - Rear Window

DESCRIPTION & OPERATION

The rear window defogger consists of an electrical grid on rear window glass. The rear window defogger switch is located in the instrument
cluster bezel. On Capri, the switch is a push type and includes a small indicator light in the switch to indicate when rear defogger is on. On
Festiva, the switch is a rocker type and includes a small indicator light in instrument cluster to indicate when rear defogger is on.

On Capri, the defogger circuit includes a 10-amp METER fuse which receives battery power from ignition switch and a 20-amp HTD B-
LIGHT fuse which has battery power at all times. The wire from the METER fuse goes to the rear defogger switch and then to the relay. The
wire from the HTD B-LIGHT fuse goes to the rear defogger relay and then to the grid. See

Fig. 1

.

Fig. 1: Rear Window Defogger Wiring Diagram (Capri)

Courtesy of FORD MOTOR CO.

On Festiva, the defogger circuit includes a 15-amp DEFOG fuse which receives battery power from ignition switch. The wire from the fuse
goes to the rear defogger switch and then to the grid. The defogger circuit does not contain a relay. See

Fig. 2

.

Fig. 2: Rear Window Defogger Wiring Diagram (Festiva)

Courtesy of FORD MOTOR CO.

TROUBLE SHOOTING

DEFOGGER DOES NOT OPERATE

Blown fuse(s) or poor contact. Defogger switch defective. Defogger relay defective. Poor connections. Broken wire. Defective grid filament.

INDICATOR LIGHT DOES NOT WORK BUT DEFOGGER DOES WORK

Open circuit from rear defogger switch to instrument panel (Festiva). Defective light bulb. Defective flexible circuit on instrument cluster.

TESTING

SYSTEM TESTING

1. Ensure all in-line fuses or circuit breakers are okay. Turn ignition and control switches to ON position. Glass should feel warm after a

few minutes.

2. If glass is not warm, use a test light or voltmeter to check for battery voltage at grid feed wire. If voltage is not correct, check wiring

harness, control switch and flexible circuit on instrument cluster. See FILAMENT TESTING.

REAR DEFOGGER SWITCH TESTING

Capri

Remove rear defogger switch. Using an ohmmeter, ensure continuity exists between terminals listed in table at specified switch positions. If
switch does not test as specified, replace rear defogger switch. See REAR DEFOGGER SWITCH CONTINUITY (CAPRI) table.

REAR DEFOGGER SWITCH CONTINUITY (CAPRI)

Festiva

Remove rear defogger switch. Using an ohmmeter, ensure continuity exists between terminals listed in table at specified switch positions. If
switch does not test as specified, replace rear defogger switch. See REAR DEFOGGER SWITCH CONTINUITY (FESTIVA) table. See

Fig.

3

.

REAR DEFOGGER SWITCH CONTINUITY (FESTIVA)

Fig. 3: Identifying Rear Defogger Switch Terminals (Festiva)

Courtesy of FORD MOTOR CO.

REAR DEFOGGER RELAY TESTING

Unplug rear window defroster relay. Relay is located in left rear corner of luggage compartment. Apply battery voltage and ground to

NOTE:

On Capri, if indicator light is not working, replace switch.

Terminal

Position

Continuity

BLK/YEL - BLK/WHT

Off

No

BLK/YEL - BLK/WHT

On

Yes

Terminal

Position

Continuity

BLK/WHT - BLK/BLU

Off

No

BLK/WHT - BLK/BLU

On

Yes

RED/GRN - BLK

Off

No

RED/GRN - BLK

On

Yes

Black/White and Black wire terminals of relay. Check continuity of relay across 2 Black/Yellow wire terminals of relay. Continuity should
exist when relay is energized. When relay is de-energized, continuity should not exist.

FILAMENT TESTING

1. To locate breaks in grid wire filaments, attach a voltmeter to middle portion of each filament. Attach other meter probe to vertical

section of window grid.

2. If a grid is broken, meter will register either zero volt or battery voltage, depending on if grid is broken between or outside test leads. If

wire is not broken, meter will register about one half of battery voltage. To locate break, move probe along wire until meter needle
moves abruptly.

REMOVAL & INSTALLATION

REAR DEFOGGER SWITCH

Removal & Installation (Capri)

1. Disconnect negative battery cable. Pull out center storage compartment. Remove 2 nuts, 2 lower screws, and heater/radio bezel. Pull

outward and remove 2 trim covers, one located on each side of steering column.

2. Remove instrument panel bezel retaining screws and pull instrument bezel from dash. Disconnect electrical connector from rear

defogger switch. Depress tangs on both sides of switch and remove switch. To install, reverse removal procedure.

Removal & Installation (Festiva)

Disconnect negative battery cable. Remove steering column covers. Remove screws securing instrument panel bezel to instrument panel. Pull
instrument bezel away from instrument panel. Disconnect electrical connectors from switches in bezel. Compress rear defogger switch lock
tabs and remove switch from bezel. To install, reverse removal procedure.

WIRING DIAGRAMS

See appropriate chassis wiring diagram in the WIRING DIAGRAMS Section.

Copyright 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.

Article GUID: A00028302