Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Power Transistor HVAC: Testing and Inspection

BLOWER FAN AND MOTOR CHECK




When battery voltage is applied between the terminals, check that the motor operates. Also, check that there is no abnormal noise.

RESISTOR CHECK







Use an ohmmeter to measure the resistance between the terminals. Check that the measured value is at the standard value.