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(A7) Heating and Air Conditioning

Video links by ASE Content Area. Includes video date, video length, and Halderman rating of Good, Better, or Best.

A. General: A/C System Diagnosis and Repair (click to expand)
A/C Leak Testing and Repair Part 1 95 Jeep (Time 40:34) (2016) (Good)

A/C Leak Testing and Repair Part 2 95 Jeep (Time 59:19) (2016) (Good)

A/C Leak Testing and Repair Part 3 95 Jeep (Time 38:41) (2016) (Good)

A/C Leak Testing Using Compressed Air, Soap and Water (Any Car) (Time 15:55) (2017) (Good)

A/C Not Working The Car Wizard Shows How to Easily Isolate the Problem (Time 18:55) (2020) (Better)

A/C System Inspection and Testing (Time 20:01) (2016) (Good)

Air Conditioning High Low Sensor “Pin Out” (Live Testing with System Pressure Reduction) (Time 7:33) (2020) (Good)

Auto Air Conditioning 101 (Time 4:59) (2015) (Better)

Auto Air Conditioning System Overview (Time 2:44) (2014) (Better)

Automotive A/C Diagnostics, Operation and Repair (Time 16:47) (2017) (Good)

Automotive A/C Leak Testing. Easiest Method Using Compressed Air. (Time 1:42) (2020) (Good)

Automotive A/C System Leak Testing with UV Dye (Time 11:24) (2017) (Better)

Automotive How To: A/C System Diagnosis for Beginners (Time 28:00) (2020) (Better)

Cold Heat? Hot AC? Diagnose Temperature Problems in Your Car or Truck (Time 4:51) (2020) (Best)

Cooling System (Time 16:20) (2013) (Better)

Denso: How Does an A/C System Operate (Time 5:54) (2019) (Better)

How a Car A/C System Works for Beginners (Time 9:47) (2015) (Good)

How a Car Automatic HVAC System Works (Time 14:31) (2019) (Good)

How Automotive HVAC Systems Work (Time 1:38) (2014) (Better)

How the Heck Does A/C Actually Cool Air? (Time 11:49) (2018) (Better)

How to Quickly Diagnose A/C Concerns (Time 13:08) (2016) (Better)

How to Utilize UV Dye to Find a Leak In Your A/C System (Time 2:11) (2020) (Best)

Mobile A/C Best Practices (Part 2) (Time 1:30:09) (2016) (Good)

Model 3 HVAC System Explained Model Three Owners Club (Time 4:39) (2017) (Good)

Most Common A/C System Failures (Time 16:59) (2020) (Better)

Performing Vacuum Test for Leaks on an Air-Conditioning System (Time 2:52) (2019) (Good)

R134a A/C System Pressure – How to Spot the Issues! (Time 4:58) (2019) (Best)

The Engineering Behind HVAC (Time 7:02) (2013) (Good)


Task 1: Identify and interpret heating and air conditioning problems; determine needed action.

Task 2: Research vehicle service information including refrigerant/oil type, vehicle service history, service precautions, and technical service bulletins.

Task 3: Performance test A/C system; identify problems.

Task 4: Identify abnormal operating noises in the A/C system; determine needed action.

Task 5: Identify refrigerant type; select and connect proper gauge set/test equipment; record temperature and pressure readings.

Task 6: Leak test A/C system; determine needed action.

Task 7: Inspect condition of refrigerant oil removed from A/C system; determine needed action.

Task 8: Determine recommended oil and oil capacity for system application.

Task 9: Using a scan tool, observe and record related HVAC data and trouble codes.

B. Refrigeration System Component Diagnosis and Repair (click to expand)
A/C Clutch Does Not Engage Diagnostic Fundamentals (Full Charge) (Time 38:55) (2019) (Good)

A/C Clutch Not Engaging 2005 Honda Odyssey (Time 39:43) (2016) (Good)

A/C Compressor Voltage (Time 5:27) (2020) (Good)

A/C Evaporator Core Cleaning (Time 1:30) (2019) (Better)

Air Conditioning Compressor Clutch Diagnosis (Time 1:42) (2016) (Good)

Air Conditioning Not Working (Bad Compressor) (Time 9:31) (2016) (Good)

Automotive HVAC Heater Repair (Time 4:00) (2013) (Good)

Avoid These Common Causes of A/C Compressor Failure (Time 15:30) (2020) (Better)

Chrysler/Dodge Fan Runs when Power Is Off!? Simple Test and Repair (Time 8:04) (2020) (Best)

Denso Compressor Oil Balancing (Time 2:30) (2020) (Better)

Diagnosing Variable Displacement Compressors (Time 8:14) (2020) (Better)

Four Signs of a Bad A/C Compressor Clutch Not Disengaging Clicks on and off Not Pinning Seized Noise (Time 3:05) (2021) (Better)

Honda Pilot A/C Clutch Test (Time 4:15) (2016) (Better)

How an A/C Compressor Works (Time 7:38) (2018) (Good)

How to Check the A/C Condenser of a Car (Time 5:06) (2019) (Best)

How to Fix Car AC, A/C Pressure Switch (Time 7:58) (2020) (Good)

How to Fix Your Cars Air Conditioner (Time 10:03) (2016) (Good)

How to Flush the A/C System Visual Inspection of Oil and Refrigerant (Time 6:27) (2019) (Best)

How to Properly Install an Orifice Tube (Time 1:38) (2014) (Good)

HVAC Blower Motor and Circuit (Time 3:27) (2013) (Good)

HVAC Compressor Clutch Operation (Time 4:09) (2013) (Good)

Signs of a Bad Evaporator Core failing Symptoms leaks water not blowing cold air (Time 2:33) (2020) (Better)

Symptoms of a Bad A/C Compressor (Time 3:31) (2019) (Better)

Testing A/C Switch and Pressure Sensor (Time 5:56) (2017) (Good)

Three Signs of a Bad A/C Compressor Failing Symptoms Makes Noise Freezing (Time 2:43) (2020) (Better)

Three Signs of a Bad A/C Condenser Failing Symptoms Blowing Hot Air Leaks (Time 2:17) (2020) (Better)

Three Signs of a Bad A/C Pressure Switch Sensor Failing Three Wire Troubleshooting Test (Time 2:25) (2021) (Best)

VW A/C Compressor Solenoid Valve Diagnosis and Replacement Sanden Pxe16 and Pxe14 (Time 6:00) (2016) (Good)


Task 1: Inspect, remove, and/or replace A/C compressor drive belts, pulleys, tensioners and visually inspect A/C components for signs of leaks; determine needed action.

Task 2: Inspect, test, service and/or replace A/C compressor clutch components and/or assembly; check compressor clutch air gap; adjust as needed.

Task 3: Remove, inspect, reinstall, and/or replace A/C compressor and mountings; determine recommended oil type and quantity.

Task 4: Identify hybrid vehicle A/C system electrical circuits and service/safety precautions.

Task 5: Determine need for an additional A/C system filter; perform needed action.

Task 6: Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves; perform needed action.

Task 7: Inspect for proper A/C condenser airflow; determine needed action.

Task 8: Remove, inspect, and replace receiver/drier or accumulator/drier; determine recommended oil type and quantity.

Task 9: Remove, inspect, and install expansion valve or orifice (expansion) tube.

Task 10: Inspect evaporator housing water drain; perform needed action.

Task 11: Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and/or control module) to interrupt system operation; determine needed action.

Task 12: Determine procedure to remove and reinstall evaporator; determine required oil type and quantity.

Task 13: Remove, inspect, reinstall, and/or replace condenser; determine required oil type and quantity.

C. Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair (click to expand)
Car Radiator Flushing (Time 2:37) (2020) (Best)

Change Your Vehicle’s Cabin Air Filter (Time 2:34) (2018) (Better)

Coolants Explained (Time 3:15) (2017) (Better)

Engine Coolant Temp Sensor Diagnosis (Time 11:18) (2019) (Best)

Engine Cooling How It Works (Time 11:35) (2018) (Better)

Flushing a Heater Core (Time 29:33) (2017) (Good)

Found Puddles Under Your Car Or Truck? How To Diagnose Coolant Leaks! (Time 7:42) (2020) (Best)

Four Signs of a Bad Coolant Temperature Sensors Failed Symptoms Overheating (2020) (Better)

Gates Training: Cooling System – Part 2 – Contamination (Time 6:58) (2017) (Better)

How Does a Radiator Work? (Time 0:59) (2021) (Best)

How to Back Flush Your Heater Core By Yourself (Time 7:07) (2017) (Better)

How to Diagnose a Loose or Stuck Belt Tensioner on Your Car or Truck (Time 6:53) (2020) (Best)

How to Flush Your Coolant! (Time 21:24) (2020) (Better)

How to Flush: the Three Best Ways! (Time 5:40) (2019) ( Best)

How to Pressure Test Vehicle Cooling System (Time 6:20) (2019) (Best)

How to Properly Inspect Your Engine Belts (Time 4:09) (2018) (Best)

How To Replace Engine Water Pump 09-18 Toyota Rav4 (Time 25:48) (2019) (Best)

How to Replace Heater Core 91-98 GMC K1500 (Time 8:03) (2017) (Better)

How to Replace Idler Pulley 00-08 V8 5.3L Chevy Suburban (Time 5:02) (2017) (Better)

How to Replace Thermostat Gasket Housing 96-11 Ford Crown Victoria (Time 6:58) (2017) (Best)

How to Replace Upper Radiator Hose 01-05 BMW 325Xi (Time 15:36) (2019) (Best)

How to Replace Water Pump 00-04 Ford Focus (Time 24:45) (2019) (Best)

How to Replace Water Pump 01-11 Ford Ranger V6 4.0L (Time 18:41) (2016) (Better)

How to Replace Water Pump 03-08 Dodge Ram (2016) (Better)

How to Test an Engine Coolant or Intake Air Temperature Sensor (Any Car) Time 4:26) (2015) (Good)

How to Test Antifreeze Coolant, Battery, Washer Fluid (Time 10:50) (2018) (Better)

How to Test Your Coolant with a Multimeter (Time 4:03) (2020) (Best)

How to Use Coolant (Anti Freeze) Tester (Time 4:04) (2018) (Better)

How to Check Flush and Fill Your Vehicle’s Coolant (Time 4:31) (2018) (Best)

How to Replace The Radiator Hoses on a Chevy 5.3 Liter V8 Engine (Time 4:05) (2020) (Best)

How to Replace Upper and Lower Radiator Hoses (Time 7:24) (2019) (Best)

Oil Cooler Install (Time 15:48) (2018) (Good)

Serpentine And Drive Belts (Time 12:13) (2020) (Best)

Tesla Model 3 – Cooling System Overview (Time 5:23) (2018) (Good)

Test Antifreeze Coolant Concentration with a Refractometer (Time 6:19) (2018) (Good)

Three Signs of a Bad Heater Core Failing Symptoms Clogged Overheating Leaks (Time 2:03) (2020) (Better)

Using a Refractometer to Test Coolant (Time 2:47) (2019) (Best)

Water Pumps: Explained in Super Detail (Time 15:06) (2019) (Better)

When You Do and Do Not Need a Thermostat (Time 3:02) (2018) (Best)


Task 1: Inspect engine cooling and heater systems hoses and pipes; perform needed action.

Task 2: Inspect and test heater control valve(s); perform needed action.

Task 3: Diagnose temperature control problems in the HVAC system; determine needed action.

Task 4: Determine procedure to remove, inspect, reinstall, and/or replace heater core.

D. Operating Systems and Related Controls Diagnosis and Repair (click to expand)
Blower Motor Fan Only Works on High Speed? (Time 5:24) (2020) (Best)

Chill Out with Your Climate Controls Car HVAC Explained (Time 2:54) (2017) (Better)

Computer Controlled Blower Motor Testing (Cadillac) (Time 5:45) (2018) (Good)

Diagnosing the Automotive Air Conditioner Electrical Circuits (Time 8:49) (2016) (Better)

Diagnostic: Why Is the Heater in My Car Not Working? (Time 3:10) (2019) (Best)

Dual Zone Climate Control Working (Time 1:41) (2020) (Better)

Engine Coolant Temperature Sensor Testing (Time 1:43) (2019) (Better)

Ford Vehicles: Frequent Blend Door Actuator Failures and Why?(Time 6:49) (2016) (Good)

Heat Stopped Working in My Car! Blower Motor or Resistor? (Time 6:32) (2019) (Best)

How a Cabin Air Filter Works (Time 2:07) (2015) (Better)

How to Change the Cabin Air Filter for Your Car (Time 3:42) (2017) (Better)

How to Replace Blend Door Actuator 00-03 Chevy Monte Carlo (Time 4:39) (2014) (Good)

How to Replace Temperature Blend Door Actuator 95-02 Ford Explorer (Time 6:49) (2010) (Good)

How to Test a Chevy Blower Motor Resistor (Time 24:14) (2018) (Best)

HVAC Actuator Reset AC Delco (Time 3:01) (2017) (Better)

Low Air Flow Out the Vents No Heat (Time 13:57) (2016) (Good)

Nissan Pathfinder: No Heat Blower Motor Stops Working (Time 7:19) (2020) (Good)

Troubleshooting a Ford Electronic Automatic Temperature Control Module (Time 28:19) (2017) (Good)

Understand Blower Motor Circuits to Better Diagnose Problems (Time 5:14) (2019) (Best)

What Does a Cabin Air Filter Do, and How Does Your Car’s A/C System Work? Animation (Time 11:32) (2020) (Best)

What Is Inside a Heater Core Box? (Time 10:12) (2016) (Good)


Task 1: Inspect and test HVAC system blower motors, resistors, switches, relays, wiring, and protection devices; determine needed action.

Task 2: Diagnose A/C compressor clutch control systems; determine needed action.

Task 3: Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the heating, ventilation, and A/C (HVAC) system; determine needed action.

Task 4: Inspect and test HVAC system control panel assembly; determine needed action.

Task 5: Inspect and test HVAC system control cables, motors, and linkages; perform needed action.

Task 6: Inspect HVAC system ducts, doors, hoses, cabin filters, and outlets; perform needed action.

Task 7: Identify the source of HVAC system odors.

Task 8: Check operation of automatic or semi-automatic HVAC control systems; determine needed action.

E. Refrigerant Recovery, Recycling, and Handling (click to expand)