10 Auto Heating & Air Conditioning
Engine Cooling System Problems 322
Overheating / Coolant Leaks / Causes of Air-cooled
Engine Overheating / Overcooling
Heater Service 323
Changing Heater Hoses and Shutoff Valves /
Changing Heater Cores
Liquid Cooling System Service 327
Changing Coolant and Flushing the Cooling
System / Belt and Hose Replacement / Thermostat
Replacement / Cooling Fan Replacement / Coolant
Pump Replacement / Radiator Replacement
Air Cooling System Service 333
Cleaning Fins on an Air-cooled Engine / Replacing
Blower Belt / Replacing Blower and Bearing /
Replacing Thermostat
Chapter 21:
Air Delivery and Manual HVAC Control
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
Air Delivery and Manual Control System Problems 338
Blower Motors and Related Parts / Cabin Filter/Air
Intake Filter / Ducts and Air Doors / Manual Control
Panels
Air Delivery and Control System Service 342
Blend Door Cable Adjustments / Removal and
Replacement of Components / Checking Afterblow
Modules
Chapter 22:
Automatic Temperature Control
System Service . . . . . . . . . . . . . . . . . . . . . . 353
Automatic Temperature Control System Problems 354
Electronic Temperature Control Systems / Electronic
Control System Self-Diagnosis
Electronic Temperature Control System Testing 359
Testing Input Sensors / Testing Output Devices /
Mechanical Temperature Control Systems /
Electromechanical Temperature Control Systems
Electronic Temperature Control System Service 360
Computer Reprogramming / Control Head /
Temperature Control Computer / Air Temperature
and Sunload Sensors / Replacing Output Devices
Mechanical and Electromechanical System Service 364
Adjusting Transducer Cables / Replacing System
Parts / Power Servo / Amplifi ers
Chapter 23:
Air Conditioning System Installation and
Retrofi tting . . . . . . . . . . . . . . . . . . . . . . . . . 367
Aftermarket Air Conditioners 368
Aftermarket Air Conditioning Kits / Aftermarket
Air Conditioning Considerations / Installing an
Aftermarket Air Conditioner
R-12 to R-134a Retrofi tting 375
Whether to Retrofi t / Level of Retrofi t / Performing a
Complete Retrofi t
Chapter 24:
ASE Certifi cation. . . . . . . . . . . . . . . . . . . . . 383
Reasons for ASE Tests 384
Applying for the ASE Tests 384
Preparing for the ASE Tests 386
Taking the ASE Tests 386
Types of ASE Test Questions 386
One-part Question / Two-part Question / Negative
Questions / Incomplete Sentence Questions / The
ASE Heating and Air Conditioning Test
Test Results 389
Recertifi cation Tests 390
Certifi cation in Refrigerant Recovery and
Recycling 391
Chapter 25:
Career Preparation . . . . . . . . . . . . . . . . . . . 393
Automotive Servicing 394
Levels of Automotive Service Positions 394
Helpers / Apprentices / Certifi ed Technicians
Types of Auto Service Facilities 395
New Vehicle Dealers / Chain and Department Store
Auto Service Centers / Tire, Muffl er, and Other
Specialty Shops / Independent Repair Shops / Fleet
Agencies / Government Agencies / Self-Employment
Other Opportunities in the Auto Service
Industry 398
Shop Supervisor or Service Manager / Salesperson or
Service Advisor / Parts Person
Getting a Job 399
Finding Job Openings / Applying for the Job
Appendix A:
Rear Window and Mirror Defrosters . . . . . 403
Defroster Components and Operation 404
Defroster Operation / Older Rear Window Defoggers
Defroster Diagnosis 405
Defroster Service 406
Replacing Switches and Relays / Repairing the
Window Grid
Useful Tables. . . . . . . . . . . . . . . . . . . . . . . . 411
Acknowledgments. . . . . . . . . . . . . . . . . . . . 414
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425