All manufacturers build vehicles to meet consumer demands for greater “creature comfort”.  Air conditioning is almost considered standard equipment on all vehicles.  While basic air conditioning operation remains unchanged, the controls for air conditioning continue to change.  Mode operation and even fan speed controls continue to evolve.  Even though the PCM controlling the compressor is not a new concept, how the AC request is sent to the PCM varies greatly among vehicle lines.  Often multiplexing and/or the BCM is involved in the AC request signal even on simple vehicles.

This course will cover GM HVAC controls including front and rear truck controls and some dual zone systems.  This course will also teach how multiplexing is involved in AC controls.  Basic AC operation will be reviewed, but this is not a basic course. GM Trucks and Cars will be covered.

COURSE OUTLINE

1. HVAC Acronyms
2. Competitors approach
3. Truck & Car HVAC controls (including front and rear controls and some dual zone controls)
4. Truck & Car AC Request – Multiplexing BCM involvement
5. Truck & Car Compressor Controls
6. Diagnostics 

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