Heater fan motor failure — diagnosis and repair

Tags: #heater · #hvac · #part-number

Symptom: heater fan motor stopped working in cold weather.¹

Diagnostic step. A direct electrical bypass test — powering the fan motor via the cigarette lighter circuit — temporarily restored function. This indicates the motor itself is likely still functional; the fault is in the control circuit feeding it, not the motor.¹²³

Likely cause: the heater regulator/resistor (rheostat) has burned out or failed — this component controls fan speed and sits between the switch and the motor. Part: "реостат отопителя резистор" GV7D61B15.⁴⁵

Fix: replace the heater resistor/regulator module — not the fan motor itself, since the motor tested functional via the bypass.⁴⁵

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Sources

This page is compiled from 5 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29