TechASSIST: Heater Blower Motors

As a moving part, blower motors will naturally wear out over time and likewise blower motor resistors are subject to heat when regulating voltage to the motor. This again makes them subject to failure over time.

However, it is always important to identify any other possible root cause, especially if the failure is deemed to be premature.

Blower motors not functioning correctly or not at all, can be caused by several key components in the electrical system. It is essential to test them all before replacing any of them. 

We recommend beginning diagnostics at the start of the related circuit rather than the end. Thankfully the components at this end are quicker, easier and cheaper to resolve!

However, it is still important to continue testing/inspecting all components even if a fault is found early on. As failure may have been caused by faults further up the chain.

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