Why does my AC fan only work on high?

When the resistor fails, typically, the highest setting is the only option that still functions. This is because the air from the blower motor is bypassing the resistor, thus gaining the maximum amount of voltage, resulting in full power. In other cases, there could be an issue with your AC module or the fan switch.

How do you reset an AC Silverado?

Below is a step-by-step guide to helping you reset your Chevy Silverado’s AC controls:

  1. Turn your car’s ignition off.
  2. Unplug the HVAC fuse.
  3. Plug it back again and wait for around a minute.
  4. After waiting for a minute or two, your car is done resetting your AC.

Does blower motor resistor affect AC?

As the fan speed is one of the most frequently adjusted settings of the air conditioning system, the blower motor resistor is put under constant stress, which can cause it to eventually fail. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.

Why does my car AC not cool at high speeds?

The A/C thermal expansion valve (TXV) most likely is the cause of the A/C system freezing up at higher engine or vehicle speeds.

Why is my Chevy Silverado AC not working?

The most common causes that hinders normal operation of air conditioning system on your Chevy Silverado 1500 are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system.

What are the signs of a bad blower motor resistor?

Symptoms of a bad heater blower motor resistor

  • Fan does not work at all, so no air comes out of the vents.
  • Fan only works on some speeds and not others.
  • Fan only works on the highest speed.
  • Fan runs all the time and can’t be controlled with the fan switch.
  • You see smoke coming out of the vents.

Why is my 2006 Chevy Silverado 5 speed heat not working?

2006 silverado 5 speed heat, the high speed is not working. I do have the 4 lower speeds The switch, high blower speed relay or the wire harness at the blower motor has gone bad.

Why is my heater fan running slow on my truck?

Hello, pretty easy fix for this. replace the blower resistor assembly mounted under the passenger side of dash the resistor is held in place with 5.5 mm screws These trucks have what is called a “blower motor resistor”. It is used to lower the voltage reaching the heater fan which results in a slower speed.

Why does my blower run on high on high?

The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch’s contact on that setting or the relay and may be the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good.