Title: Test the HVAC blower motors, resistors, switches, relays, modules, wiring, and protection devices.
Course: Diesel Equipment Technology III (20107-III) > Section: HVAC: Servicing the Electrical Operating Systems and Related Controls

Testing should include a manufacturer performance A/C test to ensure the system is working as designed.

ASE 1: VI. Heating, Ventilation, and Air Conditioning: D. Operating Systems and Related Controls (P-1)

Process/Skill Questions:

- What is the problem when a blower will only work on one or two speeds?
- What occurs when the blend air door stays closed?