Table of Contents
- 1 Why does my blower fan only work on high?
- 2 How do I know if my blower motor control module is bad?
- 3 Where is the blower control module located?
- 4 Where is the blower fuse?
- 5 Why does my AC work on low but not high?
- 6 Why is my blower motor stuck on one setting?
- 7 Why is my 1995 GMC k1500 blower not working on high?
- 8 Is there a high speed relay on the blower motor?
Why does my blower fan only work on high?
Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.
How do I know if my blower motor control module is bad?
Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue.
- Blower motor stuck on one speed.
- Blower motor does not work on certain settings.
- No air from the vehicle’s vents.
What are the symptoms of a bad blower motor relay?
If you have a faulty blower motor, you may experience low airflow from the vents, even when the fan is on high. There will be no air coming from the vents if your fan isn’t working due to a bad blower motor resistor.
Where is the blower control module located?
It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.
Where is the blower fuse?
Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
Where is the blower motor reset button?
Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.
Why does my AC work on low but not high?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.
Why is my blower motor stuck on one setting?
A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.
Why does my blower motor have 3 blower speeds?
The blower motor resistor is what’s responsible for giving you three blower speeds. The resistor block contains three different high resistance coils. Think of these coils like a filament in a light bulb. The coil resistance causes them to heat up, thereby reducing the amount of voltage that can flow to the blower motor.
Why is my 1995 GMC k1500 blower not working on high?
Here is a possible solution for your 1995 GMC K1500 blower that wont work on high. First remove the glove box and set it aside. Now look into the area that the glove box resided. You will see a wire harness covered in factory foam and next to this on the right you will see a flat silver box that is your ECM.
Is there a high speed relay on the blower motor?
Yes there is a high speed relay which sounds like it is out. Here is a guide to help test it and the blower motor wiring diagrams so you can see how the system works with the relay location below as well. Check out the diagrams (Below). Please let us know what happens.