Ford F-150 1999 - User Manual

Climate Control System
Refer to Wiring Diagrams Cell 54, Air Conditioner/Heater for schematic and connector information.
Vacuum Schematic
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Manual A/C
SECTION 412-00: Climate Control System - General Information 1999 F-150/250 Workshop Manual
DIAGNOSIS AND TESTING
Procedure revision date: 07/02/2002
Special Tool(s)
Alternator, Regulator, Battery and Starter Tester (ARBST)
010-00725 or equivalent
New Generation Star (NGS) Tester
418-F048 (007-00500) or equivalent
R-134a Manifold Gauge Set
176-R032A or equivalent
A/C Pressure Test Adapter
412-093 (T94P-19623-E)
R-12/R-134a Air Conditioning Test Fitting Set
412-DS028 (014-00333) or equivalent
Refrigeant Leak Detector
216-00001 or equivalent
Radiator/Heater Core Pressure Tester
014-R1072 or equivalent
EEC-V 104-Pin Breakout Box
418-049 (014-00950) or equivalent
Page 1 of 301999 F-150/250 Workshop Manual
8/16/2010http://www.fordtechservice.dealerconnection.com/pubs/con...

Summary

Climate Control System Overview

Special Tools for Climate Control

Lists essential tools required for climate control system diagnosis and repair.

Manual A;C Vacuum System Diagrams

Vacuum Schematic and Connector View

Diagrams illustrating vacuum routing and connector pinouts for manual A/C systems.

Climate Control Inspection and Diagnosis

Visual Inspection and Symptom Chart

Guides for visual checks and symptom-based troubleshooting of climate control issues.

Pinpoint Test A: Airflow Direction Issues

System Airflow and Vacuum Supply Checks

Steps to verify system airflow and the vacuum supply hose for proper operation.

Pinpoint Test A: Vacuum Leak Checks

Vacuum Hose, Check Valve, and Leak Testing

Procedures to test vacuum hoses, check valves, and identify leaks in the system.

Pinpoint Test A: Vacuum Reservoir and Hose Testing

Vacuum Reservoir Tank and Supply Hose Checks

Testing the vacuum reservoir tank and the function selector switch supply hose.

Pinpoint Test A: Control Assembly and Hose Obstructions

Control Assembly Vacuum Drop and Hose Obstruction Tests

Tests for vacuum drop in the control assembly and obstructions in the supply hose.

Pinpoint Test A: Harness, History, and Damper Door Checks

Jumper Harness, Vehicle History, and Damper Door Hose Testing

Testing jumper harness, reviewing vehicle history, and checking vacuum hoses to damper doors.

Pinpoint Test A: Vacuum Circuit Integrity Verification

Vacuum Harness, Circuit, Connections, and Hose Integrity

Verifying vacuum harness colors, circuit integrity, connections, and vacuum hose condition.

Pinpoint Test A: Vacuum Control Motor Checks

Control Motor Leaks and Installation Verification

Tests for vacuum control motor leaks and proper attachment to the damper door.

Pinpoint Test B: No or Insufficient Heat

Engine Coolant Level and Heater Core Inlet Hose

Checks for proper engine coolant level and heater core inlet hose temperature.

Pinpoint Test B: Cooling System and Heater Core

Cooling System Pressure and Heater Core Outlet Hose

Pressure testing the cooling system and checking the heater core outlet hose temperature.

Pinpoint Test C: A;C System Operation Issues

PCM PID ACCS Check with A;C Off

Verifying PCM Parameter Identifier Access status with A/C off.

Pinpoint Test C: PCM PID and Cycling Switch Checks

PCM PID WAC and A;C Cycling Switch Voltage

Checking PCM PID WAC status and measuring A/C cycling switch voltage.

Pinpoint Test C: A;C Clutch and System Pressure

A;C Cycling Switch, System Pressure, and Circuit 347

Testing A/C clutch engagement, system pressure, and Circuit 347 continuity.

Pinpoint Test C: Pressure Cutoff Switch Checks

A;C Pressure Cutoff Switch Voltage and Function

Measuring voltage at the A/C pressure cutoff switch and testing its function.

Pinpoint Test C: Circuit Resistance Checks

Circuit 348 and Circuit 295 Resistance Testing

Measuring resistance in circuits 348 (VT) and 295 (LB/PK) for proper continuity.

Pinpoint Test C: Compressor Clutch Coil and Circuit Checks

Clutch Coil Voltage, Ground, and Circuit 321 Checks

Checking A/C compressor clutch coil voltage, ground connection, and circuit 321.

Pinpoint Test C: Relay and PCM Output Checks

Circuit 883, WAC Output, and Circuit 331 Testing

Testing circuit 883, PCM WAC output, and circuit 331 for proper operation.

Pinpoint Test C: Compressor Clutch Gap Adjustment

A;C Compressor Clutch Gap Measurement and Adjustment

Measuring and adjusting the A/C compressor clutch air gap for correct operation.

Pinpoint Test D: No Temperature Setting Operation

A;C Electronic Blend Door Actuator System Check

Testing the A/C electronic blend door actuator motor system for temperature control issues.

Pinpoint Test D: Fuse, Circuit, and Voltage Checks

Fuse 5, Circuit 295, and Actuator Motor Voltage Tests

Checking fuse status, circuit 295 continuity, and actuator motor voltage.

Pinpoint Test D: Potentiometer and Circuit Resistance

A;C Control Potentiometer and Circuit 57 Resistance Tests

Measuring resistance of the A/C control potentiometer and circuit 57.

Pinpoint Test E: Blower Motor No Operation

Checking Fuse 24 in Blower Motor Circuit

Verifying the status of Fuse 24 (10A) in the blower motor circuit.

Pinpoint Test E: Circuit and Supply Checks

Circuit 181, Fuse 23, and Blower Motor Supply Shorts

Testing circuit 181, Fuse 23 (40A), and blower motor supply for shorts.

Pinpoint Test E: Short to Ground and Voltage Checks

Circuit 399, Circuit 364, and Blower Motor Voltage Tests

Checking circuits 399 and 364 for shorts and blower motor voltage.

Pinpoint Test E: Blower Motor Ground and Continuity

Blower Motor Ground, Circuit 261, and Circuit 364 Checks

Testing blower motor ground, circuit 261 continuity, and circuit 364 for opens.

Pinpoint Test E: Voltage to Relay and Selector Switch

Voltage at Blower Motor Relay and Selector Switch

Measuring voltage at the A/C blower motor relay and function selector switch.

Pinpoint Test E: Relay Ground and Feed Circuit Checks

Blower Motor Relay Ground and Feed Circuit Continuity

Testing blower motor relay ground and feed circuit for continuity.

Pinpoint Test F: Blower Motor Operation Issues

Initial A;C Blower Motor Operation Check

Initial check of the A/C blower motor operation in various settings.

Pinpoint Test F: Blower Motor Switch and Circuit Resistance

Blower Motor Switch Positions and Circuit Resistance

Testing blower motor switch positions and resistance in associated circuits.

Pinpoint Test F: Blower Motor Switch Functionality

Blower Motor Switch Operation and Resistance Testing

Verifying blower motor switch operation and measuring terminal resistance.

Pinpoint Test G: High Blower Setting Failure

Checking A;C Blower Motor Operation in High Setting

Verifying blower motor operation when set to the high blower speed.

Pinpoint Test G: Blower Motor Speed and Switch Checks

Blower Motor Speed, Switch, and Connector Checks

Testing blower motor speed, switch continuity, and connector attachment.

Component Tests: Heater Core

Heater Core Plugged and Pressure Test Procedures

Procedures for checking if the heater core is plugged or performing a pressure test.

Heater Core Testing Procedures

Heater Core Pressure and Bench Testing

Detailed steps for pressure testing and bench testing the heater core.

A;C System Leak Testing Procedures

Evaporator, Condenser Core, and Compressor Leak Tests

Procedures for performing leak tests on A/C evaporator, condenser cores, and compressor.

Ford F-150 1999 Specifications