Part of Lesson Plan: **Introduction to Air Conditioning (updated) by Richard Williams

Activity Overview / Details

Note: for this activity I have a video camera set up with large monitors for students to observe.

I demonstrate the correct process for determining if the system is checkable, while wearing my safety glasses and explaining safety items to be aware of when working with AC systems. I will pose the following questions:

1.    Does the vehicle run?
2.    Do the A/C controls appear to work?
3.    Does the compressor clutch engage?

I then demonstrate the correct and safe process to connect the A/C manifold set.

1.    Identify the components of the system.
2.    Identify the high and low sides.
3.    Confirm the manifold valves are closed.
4.    Connect the appropriate hoses to the ports.
5.    Take a static pressure reading.
6.    Start the vehicle and turn on the A/C system. Listen for the click of the compressor clutch engaging, and for a noticeable engine RPM change.
7.    Take the running pressure readings, record and compare to specifications.
8.    Locate the orifice tube and feel both sides and notice the temperature change.
9.    Locate the pressure switch and jumper to force the compressor to continue to run. Then record findings.
10.    Turn off A/C and engine. Safely and properly disconnect the manifold set.