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Does your blower motor/fan only run on high speed.or not at all Most people don't know that the high speed blower motor fan speed setting and the medium and low speed settings are two separate electrical circuits. In this video, we talk about the cause and effect that leads to blower motor resistor failure.

Been fighting the good fight This problem is a classic blower motor resistor problem which is common on vehicles that use manual fan speed switch controls So far i have replaced the blower motor, relay, resistor, heater control panel, and ignition switch

It still only works on high

I have run out of ideas on what to try next. If you’re short on time, here’s a quick answer to your question There are several possible reasons why your car heater only works on high, including a stuck heater control valve, low coolant level, broken temperature door actuator, clogged heater core, or failed blower motor resistor Check the heater control valve describe what the heater control valve is and what it does the heater.

When a blower motor only works on high speed, it usually indicates a problem with the blower motor resistor, which controls the fan speeds This issue can also be caused by a faulty fuse, relay, or wiring within the hvac system Replacing the blower motor resistor or checking the electrical components often resolves the problem. In other designs, the failure of 1 resistor means you lose only one speed

However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high

If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor This is the most common failure mode. Not quite so.blower motor resistor or melted fan switch fyi for future readers for this blower motor problem where only the highest setting on the fan works Does your blower fan work on the high speed setting only

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