BLOWER COMPONENTS

Blower Components For Peterbilt Trucks

The HVAC blower system is responsible for moving conditioned air through your Peterbilt's cab — whether you're running heat in January or AC through a summer desert haul. Blower motor failures, resistor failures, and worn switch assemblies are among the most common cab comfort complaints on high-mileage trucks. We stock blower motors, resistors, and related components for Peterbilt trucks to keep your cab livable year-round.

Frequently asked questions about blower components

What causes a blower motor to fail on a Peterbilt?

Blower motor failures are typically caused by bearing wear from high mileage, overheating due to a clogged cabin air filter restricting airflow, or electrical issues from a failing blower motor resistor. On trucks with bunk HVAC systems, the rear blower sees additional wear from extended overnight operation. Regular cabin filter changes are one of the simplest ways to extend blower motor life.

Why does my blower only work on certain speed settings?

This is the classic symptom of a failed blower motor resistor. The resistor controls airflow speed by varying voltage to the motor — when individual resistor elements burn out, the corresponding speed settings stop working. Typically the lower speeds fail first while high speed (which bypasses the resistor) continues to function. A resistor replacement is usually a straightforward and inexpensive fix.

How do I know if it's the blower motor or something else?

Start by checking for power at the blower motor connector with the system on. If voltage is present but the motor doesn't spin, the motor itself has failed. If there's no voltage, work back through the switch, resistor, and fuse to isolate the fault. A seized motor that draws excessive current can also blow fuses and damage the resistor, so check the motor first when diagnosing repeated component failures.

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