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Heating, Ventilation and
Air Conditioning ..................................... 7A–1
General Description ............................................ 7A–1
Air Delivery Description and Operation .............. 7A–1
Air Temperature Description and Operation ...... 7A–3
Schematic and Routing Diagram....................... 7A–6
HVAC Schematics ............................................. 7A–6
HVAC Connector End Views ........................... 7A–12
Component Location ........................................ 7A–20
HVAC Component Views ................................. 7A–20
Diagnostic Information and Procedures......... 7A–24
Diagnostic Starting Point - Heating,
Ventilation and Air Conditioning..................... 7A–24
Scan Tool Output Controls - HVAC -
Automatic ....................................................... 7A–24
Scan Tool Data List - HVAC - Automatic ......... 7A–25
Scan Tool Data Definitions - HVAC -
Automatic ....................................................... 7A–26
DTC B0158 ...................................................... 7A–27
DTC B0228, B0413, B0423, B0433, B3779 or
B3782............................................................. 7A–28
DTC B3933 ...................................................... 7A–32
DTC P0532 or P0533....................................... 7A–33
DTC P0645, P0646, or P0647 ......................... 7A–35
Symptoms - HVAC Systems - Automatic ......... 7A–36
Odor Diagnosis ................................................ 7A–37
Air Conditioning Compressor Malfunction........ 7A–38
Blower Motor Malfunction ................................ 7A–40
Auxiliary Blower Motor Malfunction .................. 7A–42
Upper or Lower Duct Air Temperature Sensor
Malfunction..................................................... 7A–44
Heating Performance Diagnostic ..................... 7A–44
Defrosting Insufficient ...................................... 7A–46
Noise Diagnosis - Auxiliary Blower Motor ........ 7A–47
Noise Diagnosis - Blower Motor....................... 7A–48
Noise Diagnosis -
Air Conditioning (A/C) System ....................... 7A–49
Noise Diagnosis - HVAC Module ..................... 7A–51
Too Hot in Vehicle............................................ 7A–52
Too Cold in Vehicle .......................................... 7A–53
Too Hot in Vehicle - Auxiliary ........................... 7A–55
Too Cold in Vehicle - Auxiliary ......................... 7A–57
Air Delivery Improper ....................................... 7A–59
Air Delivery Improper - Auxiliary....................... 7A–61
Air Recirculation Malfunction ........................... 7A–63
Inside Air Temperature Sensor Malfunction..... 7A–64
Sun Load Sensor Malfunction .......................... 7A–65
Afterblow Enabling ........................................... 7A–66
Section 7
HVAC
CONTENTS
Actuator Recalibration...................................... 7A–66
Leak Testing..................................................... 7A–67
Air Conditioning (A/C) System Performance
Test (w/ C69).................................................. 7A–68
Air Conditioning (A/C) System Performance
Test (w/o C69)................................................ 7A–72
Air Conditioning (A/C) Diagnostics -
Pressure Zone A ............................................ 7A–75
Air Conditioning (A/C) Diagnostics -
Pressure Zone B ............................................ 7A–78
Air Conditioning (A/C) Diagnostics -
Pressure Zone C ............................................ 7A–80
Air Conditioning (A/C) Diagnostics -
Pressure Zone D ............................................ 7A–82
Repair Instructions ........................................... 7A–84
Odor Correction................................................ 7A–84
Refrigerant Recovery and Recharging............. 7A–85
Compressor Oil Balancing ............................... 7A–86
Compressor Hose Assembly Replacement ..... 7A–87
Compressor Replacement ............................... 7A–88
Compressor Clutch Assembly Replacement.... 7A–89
Compressor Pressure Relief Valve
Replacement .................................................. 7A–92
Sealing Washer Replacement.......................... 7A–93
O-Ring Replacement........................................ 7A–94
Liquid Line Replacement.................................. 7A–95
Evaporator Outlet Hose Replacement ............. 7A–98
Air Conditioning Refrigerant Service Valve
Core Replacement ......................................... 7A–99
Receiver Dehydrator Replacement ................ 7A–100
Thermal Expansion Valve Replacement ........ 7A–101
Air Conditioning (A/C) Refrigerant
Pressure Sensor Replacement .................... 7A–103
Air Conditioning (A/C) Refrigerant
Low Temperature Sensor Replacement ...... 7A–104
Condenser Replacement ............................... 7A–104
Air Conditioning (A/C) Evaporator Case
Assembly Replacement ............................... 7A–107
Blower Case Assembly Replacement ............ 7A–109
HVAC Module Assembly Replacement.......... 7A–111
HVAC Control Module
Programming and Setup .............................. 7A–115
Evaporator Core Replacement....................... 7A–115
Heater Inlet Hose Replacement (w/o C69) .... 7A–117
Heater Inlet Hose Replacement (w/ C69) ...... 7A–118
Heater Outlet Hose Replacement (w/o C69).. 7A–119
Heater Outlet Hose Replacement (w/C69)..... 7A–121
Passenger Compartment Air Filter Housing
Replacement ................................................ 7A–122
Table of Contents 7- i
7
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Troubleshooting
