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Does your blower motor/fan only run on high speed.or not at all When you look under there, you will see the blower motor and then a plug with 4 wires running through it. In this video, we talk about the cause and effect that leads to blower motor resistor failure.

Been fighting the good fight The blower motor resistor is located at the bottom of the heater box under the glove box 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. 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.

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. 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. If you clean every connection and the fan still only works on high, you likely have a bad resistor If your connection looks worse than mine, aka is melted severely, you'll need to replace the connector and pins and do some work to lower the chances it happens again any time soon.

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