
Explore how heat flows into a car and how an air conditioning system controls temperature to maintain comfort, despite sun, engine, and road heat.
Explore the pressure–temperature relationship in car cooling systems, showing how increasing radiator pressure prevents coolant boiling and allows temperatures up to 126 degrees Celsius.
This lecture outlines hvac charging ports labeled low L and high H, and describes protecting them with a plastic cap and rubber seal to prevent leaks during service under pressure.
Explore how the sun load sensor signals the ECM to raise or reduce blower speed for interior cooling, and how the ambient temperature sensor informs the display.
Diagnose AC performance by checking ambient temperature effects on low and high pressure, refrigerant charge, leaks, and blockages, then inspect the compressor, valves, and sensors for faults.
Demonstrate how a vehicle's air conditioning system compresses gas with a compressor, cools it in the condenser and evaporator, and uses a thermal expansion valve to deliver cold cabin air.
You will learn how to use all necessary tools to properly recharge an automotive air conditioning system, but you will also become familiar with all of the safety rules for the proper handling of refrigerants. Alternate refrigerants and the pros and cons of using multi-blends will also be discussed.
Specific topics covered in Automotive Air Conditioning Level 1 include system components, refrigerant flow, system pressures, cooling system, special tools, diagnosis, compressors, hubs and clutches, and more.
The course will be a blend of theoretical lectures and hands-on practice.
Upon successful completion of this course you should be able to:
• Understand the components and operation of a manual automotive air conditioning system;
• Diagnose an air conditioning problem;
• Know how to properly repair the problem;
• Recharge an air conditioning system.
This practical offering uses a hands-on approach to highlight refrigeration principles, heat transfer, drive units, evaporators and related components, pressure clutch drives, condensers, compressor overhaul, automotive temperature control equipment, testing for leaks, purging, evacuating and recharging. You will learn to work with manual control systems and automatic touch control systems including dual control systems.
Upon completion, you will be able to test and diagnose the air conditioning control systems of various late model North American vehicles.