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Been fighting the good fight We show you how to replace blower resistor. So far i have replaced the blower motor, relay, resistor, heater control panel, and ignition switch

It still only works on high A simple repair goes a long way 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. 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.

Hi, my 05 colorado fan only works on high (#4) 1, 2 and 3 nothing blows, turn it to 4 and it blows hard like it is supposed to

I figure it can't be a fuse as it blows on 4. 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. Every now and then , it seemed to work , then back to high only

All info pointed to a blower motor resistor replaced it , the. I have the 'knob' style buttons for settings, 0, 1, 2, & 3 blow no air at all and when set to 4 it works. If you want to know why you have a car fan that only works on high, you likely have a problem with the blower motor resistor Find out why this happens and if you should replace the blower motor and blower motor resistor together with these tips from our expert mechanics.

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