heater FORD FESTIVA 1991 Owner's Manual

GASOLINE ENGINE - MECHANICAL TROUBLE SHOOTING
BASIC GASOLINE ENGINE - MECHANICAL TROUBLE SHOOTING CHART
Overheating
Coolant LeakFill/Pressure Test System
A/C Condenser Fins CloggedRemove/Clean Condenser
Radiator Fins CloggedRemove/Clean Radiator
Thermostat Stuck ClosedReplace Thermostat
C l o gge d C o o l in g S yst e m P a ssa ge sClean/Flush Cooling System
Water Pump MalfunctionReplace Water Pump
Fan Clutch MalfunctionReplace Fan Clutch
Retarded Ignition TimingReset Ignition Timing
Cooling Fan MalfunctionTest Cooling Fan/Circuit
Cooling Fan Motor MalfunctionTest Fan Motor
Cooling Fan Relay MalfunctionTest Fan Relay
Faulty Radiator CapReplace Radiator Cap
Broken/Slipping Fan BeltReplace Fan Belt
Restricted ExhaustRepair Exhaust System
Corrosion
Impurities In CoolantClean/Flush System
Coolant Leakage
Damaged hoseReplace Hose
Leaky Water PumpReplace Water Pump
Damaged Radiator SeamReplace/Repair Radiator
Leaky Thermostat CoverReplace Thermostat Cover
Cylinder Head ProblemCheck Head/Head Gasket
Leaky Freeze PlugsReplace Freeze Plugs
Recovery System Inoperative
Loose and/or Defective Radiator CapReplace Radiator Cap
Overflow Tube Clogged and/or LeakingRepair Tube
Recovery Bottle Vent RestrictedClean Vent
No Heater Core Flow
Collapsed Heater HoseReplace Heater Hose
Pl u gge d He a t e r C o r eClean/Replace Heater Core
Faulty Heater ValveReplace Heater Valve
NOTE:This is GENERAL inform ation. This article is not intended to be specific to any unique situation or
individual vehicle configuration. T he purpose of this T rouble Shooting inform ation is to provide a list
of com m on causes to problem sym ptom s. For m odel-specific T rouble Shooting, refer to SUBJECT ,
DIAGNOST IC, or T EST ING articles available in the section(s) you are accessing.
CONDITION & POSSIBLE CAUSECORRECTION
Engine Lopes At Idle
In t ake man ifo l d -t o -h ead l eaksReplace manifold gasket, See
ENGINES
Blown head gasketReplace head gasket, See
ENGINES
Worn timing gears, chain or sprocketReplace gears, chain or
sprocket
Worn camshaft lobesReplace camshaft, See
ENGINES
Overheated engineCheck cooling system, See
COOLING
Blocked crankcase vent valveRemove restriction
Le a kin g E GR va l veRepair leak and/or replace
va l ve
Faulty fuel pumpReplace fuel pump
Engine Has Low Power
Leaking fuel pumpRepair leak and/or replace
fu el p u mp
Excessive piston-to-bore clearanceInstall larger pistons, See
ENGINES
Sticking valves or weak valve springsCheck valve train components,
See ENGINES
Incorrect valve timingReset valve timing, See
ENGINES
Worn camshaft lobesReplace camshaft, See
ENGINES
Blown head gasketReplace head gasket. See
ENGINES.
Clutch slippingAdjust pedal and/or replace
components, See ENGINES
Page 9 of 36 MITCHELL 1 ARTICLE - GENERAL INFORMATION Trouble Shooting - Basic Procedures
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HEAT ER SYST EM
1990-92 HEAT ER SYST EMS Ford Motor Co.
DESCRIPTION
The heater system consists of control panel, blower case, heater case, air control doors and ducts. The control panel incorporates 3 control
levers and a 3-speed fan switch. The control panel is located in the center of the instrument panel. All air control doors are cable operated
from the control panel.
The blower case is mounted on the bulkhead, behind the instrument panel on passenger's side of vehicle. The blower case houses a blower
motor, blower motor resistor and the fresh/recirculation air door. The heater case contains mode select door, temperature air mix door and
heater core.
OPERATION
Three control levers, temperature mix, fresh/recirculation and mode select, mechanically operate their associated cables and doors. The
temperature control lever adjusts the mix of fresh or recirculated air with heated air. In full heat position, all airflow goes through the heater
core.
In full cool position, the mix air door closes, allowing airflow to by-pass the heater core. The mode select lever, directs airflow to selected
vents. The fresh/recirculation control lever allows selection of fresh (outside) air or recirculated compartment air.
AJUSTMENT
FRESH/RECIRCULATION CONTROL CABLE
Remove the glove box. Remove fresh/recirculation cable retaining clip. Move control lever to RECIRCULATION position, while holding the
lever door in RECIRCULATION position. Ensure control lever does not move. Install fresh/recirculation cable retaining clip.
MODE SELECT CABLE
Remove mode select cable retaining clip. Move mode select lever to VENT position. Hold mode select lever downward against its stop.
Ensure that mode select lever does not move. Install mode select cable retaining clip.
TEMPERATURE CONTROL CABLE
Set temperature control lever to maximum cold position. Remove temperature cable retaining clip. Hold temperature control lever upward and
against its stop. Ensure that temperature lever does not move. Install temperature cable retaining clip.
TROUBLE SHOOTING
BLOWER MOTOR INOPERATIVE
Check blown motor fuse. Check for defective blower motor and/or blower motor resistor. Check blower motor switch. Check for open in
ground wire. Check for loose electrical connectors or poor connections. See WIRING DIAGRAMS
in this article.
BLOWER DOES NOT CHANGE SPEED
Check for defective blower motor. Check blower motor wiring harness. Check blower motor resistor. Check for blower motor fan switch. See
WIRING DIAGRAMS
in this article.
BLOWER RUNS CONSTANTLY
Check for defective blower motor resistor. Check for short in blower switch or wiring. See WIRING DIAGRAMS
in this article.
HEATER TEMPERATURE INSUFFICIENT
Check for proper coolant level. Check water pump for noise, leaks or wear. Check heater hoses for leaks or restrictions. Check heater core for
leaks, plugs or restrictions. Check inlet and outlet heater hoses for hot water flow. Check thermostat condition and operation. Check air mix
door position and adjust cable if necessary.
IMPROPER WARM AIR DISTRIBUTION
Check air mix door position. Adjust cable as necessary. Check function control door position. Adjust cable as necessary. Check for restriction
in ventilation air duct assembly. Repair as necessary.
TESTING BLOWER MOTOR & RESISTOR
1. Ensure 15-amp blower motor fuse is okay. Using voltmeter, check for battery voltage at blower motor Blue/Yellow terminal. If battery
voltage is present, go to next step. If battery voltage is not present, repair open in Blue/Yellow wire between blower motor and fuse box.
2. Disconnect blower motor connector. Using a jumper wire, apply battery voltage to Blue/Yellow terminal and ground the Blue/Red
terminal. If blower motor does not run, replace blower motor. If blower motor runs, go to next step.
3. Reconnect blower motor connector. Turn ignition on. Turn blower motor off. Disconnect the blower motor resistor connector. Using a
voltmeter, measure voltage at Blue/Red terminal of resistor connector. If battery voltage is not present, repair open in Blue/Red wire
between resistor and blower motor. If voltage is present, go to next step.
4. Using a jumper wire, ground Blue/Black, Blue/Yellow and Blue/White terminals of the blower fan switch one at a time. If the motor
runs at 3 different speeds, go to next step. If not, repair open in wire that failed to operate blower motor.
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5. Check blower motor fan switch continuity. Resistance should not exceed 4 ohms. See BLOWER MOTOR FAN SWITCH
CONTINUITY table. If continuity is not present, replace fan switch. If continuity is okay, repair open in Black wire from blower motor
switch to ground.
BLOWER MOTOR FAN SWITCH CONTINUITY
REMOVAL & INSTALLATION
CONTROL PANEL
1. Remove bezel screws and accessory bezel. Remove radio. Remove 4 screws securing control panel to instrument panel. Remove glove
box attaching screws and glove box. Remove the retaining clip and disconnect fresh/recirculation air door cable from mode door lever.
2. Disconnect mode select cable at mode control door lever. Disconnect temperature control cable at temperature control mode door lever.
Pull control panel away from instrument panel. Disconnect blower motor switch connector. Disconnect illumination electrical
connector. Remove control panel. To install, reverse removal procedure. Adjust control cables. See ADJUSTMENTS in this article.
BLOWER MOTOR FAN SWITCH
Remove control panel. See CONTROL PANEL R & I
. Remove blower motor fan switch knob. Remove attaching nut. To install, reverse
removal procedure.
HEATER CORE
1. Disconnect negative battery cable. Remove steering wheel by prying out center trim insert and removing steering wheel retaining nut.
Remove 2 steering wheel cover retaining screws and remove cover. Using a steering wheel puller, remove steering wheel.
2. Remove 5 screws and remove lower and upper steering column covers. Disconnect electrical connections and remove multifunction
switch. Remove 5 screws and pull instrument cluster hood rearward. Disconnect electrical connections and remove instrument cluster
hood.
3. Disconnect speedometer cable at transaxle. Remove 4 instrument cluster screws. Pull instrument cluster rearward and disconnect
speedometer cable and electrical connections. Remove instrument cluster.
4. Remove 2 center bracket mounting bolts under steering column and remove bracket. Remove glove box attaching screws and remove
glove box. Remove left and right heater ducts. Remove fuse panel cover. Remove 2 screws securing fuse panel and push fuse panel
inward. DO NOT remove fuse panel.
5. Slide both seats to most forward position. Remove 2 console attaching screws, located in front of seat belt anchors. Slide both seats to
rearmost position. Remove parking brake console insert. Using a Phillips screwdriver, remove push retainer insert, located at front lower
edge of parking brake console. Pull back on parking brake lever and remove parking brake console.
6. Remove gearshift knob. Remove screws and remove shift console. Remove radio/heater control panel bezel screws and remove bezel.
Remove 4 radio attaching screws. Pull radio out and disconnect antenna lead and electrical connections. Disconnect radio ground lead
and remove radio.
7. Remove 4 screws attaching heater control panel. Disconnect control cables and electrical connections. Remove control panel, while
pulling cables through opening.
8. Pry out bolt cover trim inserts in top corners of dash. Remove bolts located under trim panels. Remove 7 instrument panel attaching
bolts and 2 nuts. Pull instrument panel rearward. Disconnect any harness connectors and clips. Remove instrument panel.
9. Disconnect electrical connections at blower and resistor. Remove harness from routing brackets on heater box. Loosen clamp screw
securing air inlet housing. Remove attaching nuts at top and bottom of heater box. Disconnect defroster ducts and remove heater
assembly.
10. Disconnect link connecting 2 defroster doors. Remove attaching screw just above and to right of blower resistor. Turn heater assembly
around and remove screw just to left of blower motor opening. Remove clips securing 2 halves of heater assembly. Separate halves. Lift
out heater core.
11. To install, reverse removal procedure. Ensure all heater control cables are routed and adjusted properly. See ADJUSTMENTS in this
article. Fill cooling system. Check for leaks.
BLOWER MOTOR & RESISTOR
Disconnect negative battery cable. Remove instrument panel spacer brace located below steering column. Remove airflow duct below steering
column. Disconnect blower motor or resistor wiring. Remove 3 blower motor attaching screws or 2 resistor attaching screws and remove
component. To install, reverse removal procedure.
Switch PositionContinuity Between Wire Colors
1Black-to-Blue/White
2Black-to-Blue/Yellow & Blue/Yellow-to-Blue/Red
3Black-to-Blue/Black & Blue/Black-to-Blue/Red
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Fig. 1: Exploded View of Heater Unit

Courtesy of FORD MOTOR CO.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
WIRING DIAGRAMS

Fig. 2: Heater Wiring Diagram

ApplicationINCH Lbs. (N.m)
Steering Wheel Nut29-36 (39-49)
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Fig. 3: Heater Wiring Diagram (1992 Model)

Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00039001
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1991 AIR CONDIT IONING & HEAT
MANUAL A/C
A/C SYSTEM SPECIFICATIONS
SPECIFICATIONS
DESCRIPTION
This A/C-heater system is fully integrated to provide cooling, heating and ventilation with either fresh or recirculated air. A/C system is
expansion valve type. Interior air temperature is controlled by cycling the compressor on and off at different rates. A/C compressor is protected
by a low pressure switch, which stops compressor operation when refrigerant pressure is too low. Compressor operation is cut when throttle is
wide open to improve driveability.
The primary system components are compressor, receiver-drier, evaporator, low pressure switch, thermostatic switch, thermostatic expansion
valve, A/C control module, refrigerant lines and air ducts. See Fig. 1
and Fig. 2 . The heater core is continuously supplied with coolant. To
control temperature, air goes through and/or around heater core by way of temperature blend door.

Fig. 1: Identifying A/C System Components

Courtesy of FORD MOTOR CO. CAUT ION: When discharging air conditioning system , use only approved refrigerant recovery/recycling
equipm ent. Make every attem pt to avoid discharging refrigerant into the atm osphere.
ApplicationSpecification
Compressor TypeNippondenso 10-Cylinder
Refrigerant (R-12) Capacity25 ozs.
System Oil Capacity10 ozs.
Compressor Belt Deflection
New9/32-11/32" (8-9 mm)
Used11/32-7/16" (9-11 mm)
System Operating Pressure (1)
Low Side19-25 psi (1.3-1.7 kg/cm2 )
High Side199-220 psi (13.9-15.4
kg/cm
2 )
(1)When measured at 79°F (26°C).
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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 SW ITCH
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
.
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tube from evaporator core fins while removing thermostatic switch. To install, reverse removal procedure. Evacuate and recharge system.
THERMOSTATIC EXPANSION VALVE
Removal & Installation
1. Discharge A/C system using approved refrigerant recovery/recycling equipment. Remove evaporator housing. See EVAPORATOR
HOUSING under REMOVAL & INSTALLATION. Remove air inlet duct. See Fig. 1 .
2. Remove insulation from sensing bulb. Disconnect thermostatic expansion valve at evaporator tube fitting and inlet tube fitting (from
receiver-drier). See Fig. 3
. Remove thermostatic expansion valve. To install, reverse removal procedure. Use new "O" rings. Evacuate
and recharge system.
A/C RELAYS
Removal & Installation
A/C relays are located in left front corner of engine compartment, near battery. Unclip relay holder from its mounting bracket. Disconnect
relay wiring. DO NOT pull on wiring connector to remove relay from holder. Remove relay from holder. To install, reverse removal procedure.
A/C-HEATER CONTROL ASSEMBLY
Removal & Installation
1. A/C control module is located above radio. Remove accessory bezel. Remove radio (if necessary) and glove box. Disconnect
recirculated/fresh air cable from door lever. See Fig. 5
. Disconnect mode select cable from door lever. See Fig. 6 .
2. Disconnect temperature control cable from door lever. See Fig. 4
. Pull control assembly away from dash, and disconnect wiring
connectors. Remove control assembly.
3. To install, reverse removal procedure. Check and adjust temperature control, recirculated/fresh air and mode cables. See
ADJUSTMENTS. Test control assembly operation.
BLOWER MOTOR
Removal & Installation
Disconnect negative battery cable. Remove A/C air outlet duct located below steering column. See Fig. 2 . Disconnect blower motor wiring.
Remove blower motor attaching screws and blower motor. Remove blower wheel attaching nut. Remove blower wheel and washer. To install,
reverse removal procedure.
BLOWER MOTOR RESISTOR
Removal & Installation
Disconnect negative battery cable. Remove air duct located below steering column. See Fig. 2 . Disconnect blower motor resistor wiring.
Remove blower resistor attaching screws and resistor. To install, reverse removal procedure.
AIR DISTRIBUTION PLENUM
Removal & Installation
1. Remove instrument panel. See INSTRUMENT PANEL under REMOVAL & INSTALLATION. Drain cooling system. Disconnect
heater hoses in engine compartment. Disconnect wiring for blower motor and blower resistor. Disengage wiring harness and antenna
lead from bracket on front of air distribution housing.
2. Loosen connector duct-to-air inlet clamp screw. Remove upper and lower mounting nuts from plenum. Disengage and remove plenum
from defroster ducts. To install, reverse removal procedure. Refill cooling system, and check for leaks.
HEATER CORE
Removal & Installation
1. Remove air distribution plenum. See AIR DISTRIBUTION PLENUM under REMOVAL & INSTALLATION. Disconnect linkage
connecting defroster doors. Remove attaching screw located near blower resistor. Turn housing around and remove attaching screw
located near blower motor opening.
2. Remove clips retaining blower housing halves. Separate blower housing halves. Remove heater core. Remove tube insert from heater
core. To install, reverse removal procedure. Test system for proper operation.
INSTRUMENT PANEL
Removal & Installation
1. Disconnect negative battery cable. Remove steering wheel, steering column covers and multifunction switch assembly. Disconnect
electrical connectors from switches on instrument panel. Remove instrument cluster hood.
2. Disconnect speedometer cable from transmission. Remove 4 instrument cluster screws. Pull instrument cluster out from instrument
panel cluster enough to disconnect wiring and speedometer cable. Remove instrument cluster.
3. Remove steering column shield. Remove shield bracket. Remove glove box. Remove fuse panel cover and 4 fuse panel screws. Pull fu se
panel out, but DO NOT remove. Remove shift lever console and mount brackets. CAUTION: DO NOT rem ove screw in front of blower resistor, or blower resistor m ounting plate will fall into air
distribution plenum . T o retrieve plate, disassem ble instrum ent panel.
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4. Remove radio and A/C-heater control assembly. See A/C-HEATER CONTROL ASSEMBLY under REMOVAL &
INSTALLATION. Disconnect cigarette lighter connector. Remove snap-in trim inserts concealing instrument panel attaching bolts.
Remove 7 instrument panel attaching bolts.
5. Remove 2 lower instrument panel-to-body bracket stud nuts. Disconnect remaining electrical connectors from instrument panel.
Remove instrument panel. To install, reverse removal procedures.
WIRING DIAGRAM

Fig. 30: Manual A/C Heater System Wiring Diagram (Festiva)

Copyr ight 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
Article GUID: A00039084
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Fig. 7: Fuse Panel Identification

Courtesy of FORD MOTOR CO.
Fuse Identification
1 - 15 Amp License Plate Light, Rear Side Marker Light, Front Parking Lights, Cluster and Tail Lights
2 - 15 Amp Horn, Brakelights, High-Mount Brakelight
3 - 15 Amp (1988-89) Safety Belt Warning, Turn & Hazard Warning Flasher Lights, Radio, Trunk Light, Ignition Key Reminder Buzzer
15 Amp (1990-93) Safety Belt Warning, Turn & Hazard Warning Flasher Lights, Ignition Key Reminder Buzzer
4 - 15 Amp Audio System, Cigarette Lighter, Remote Control Mirror
5 - 15 Amp Rear Wiper/Washer, Daytime Running Light System (Canada)
6 - 15 Amp Heater & Air Conditioner
7 - 20 Amp Heater & Air Conditioner, Cooling Fan System
8 - 10 Amp (1988-89) Interior Courtesy Lights
10 Amp (1990-93) R a d io , In t e r io r C o u r t e sy Ligh t s, Lu gga ge C o mp a r t me n t Ligh t
9 - 15 Amp (1988-89) Front Wiper/Washer
15 Amp (1990-93) Front Wiper/Washer, Shift-Lock System (ATX), Engine Control System
10 - 10 Amp Charging System, Emission Control System
11 - 10 Amp (1988-90) Safety Belt Warning, Turn & Hazard Warning Flasher Lights, Back-Up Lights, Instrument Cluster, Warning
Lights,
10 Amp (1991-93) Safety Belt Warning, Turn & Hazard Warning Flasher Lights, Back-Up Lights, Instrument Cluster, Warning Lights,
Shift-Lock System
12 - 15 Amp Rear Window Defroster
13 - Not Used (1988-89) Spare
30 Amp (1990-93) Passive Restraint System (Automatic Seat Belt)
In-Line Fuse Identification
15 Amp (1990-93) Condenser Fan Motor (A/T Models Only)
10 Amp (1990-93) A/C System (located on left side of heater case)
FUSIBLE LINK BLOCK IDENTIFICATION
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