1. Use approved lineman’s gloves when removing and installing the high-voltage disconnect service plug. 2. With the gloves on, lift the handle on the service…

The duct doors control the airflow through the duct box. The types of duct doors include the following examples. Fresh/Recirculated Air Controls where the duct…

Diagnosing and repairing the blower motor can be done by using good logic and strategy. Blower motor problems tend to fall into two categories: excessive…

The AC clutch coil is used to create a magnetic field that attracts the front plate toward the pulley to engage the internal parts of…

Temperature sensors are used in the AC system to sense temperature and prevent the evaporator from getting too cold and freezing up. These sensors are…

Pressure sensors are used to monitor pressure in the AC system in a similar way that pressure switches function. The main difference is that these…

The AC system often uses pressure switches to sense pressure in the high side of the system as well as the low side of the…

Relays are magnetic switches used in the AC system to send power to loads that draw lots of current, such as the compressor clutch and…

The control panel is the device that allows the front-seat occupants to select the desired operation of the HVAC system. The control head has settings…

Circuit breakers are used for protection on circuits that draw increased amounts of amperage during normal operation, such as the blower motor. Circuit breakers are…