Why does my AC only work on 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.

Where is the blower motor on a 2007 Chevy Colorado?

The blower motor is located within the vehicle under the passenger side lower I/P. This location, while allowing for increased serviceability, does not offer much isolation from blower motor noise.

What does heater blower resistor do?

The blower motor resistor in your car is the part that is responsible for pushing air through the vents when using the air conditioner or heater. The blower motor resistor is constantly put under stress which can cause it to eventually fail.

What are the signs of a bad blower motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor

• Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting.
• Blower motor does not work on certain settings.
• No air from the vehicle’s vents.

How do you replace a blower motor resistor?

How to Replace a Blower Motor Resistor

1. Remove the negative battery terminal.
2. Locate the blower motor resistor on the passenger side under the dash board.
3. Disconnect the electrical connector to the blower motor resistor.
4. Remove the screws or bolts to the blower motor resistor and remove the resistor.

How does a AC resistor work?

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

Where is the fuse box on a 2007 Chevy Colorado?

There are two fuse boxes in the 2007 Chevy Colorado. One of them can be found in the cabin of the vehicle under the dash on the driver’s side. This is the accessory fuse boxAnd that will have most of the fuses for the interior items like the radio and interior lighting in the truck.

What is a blower motor?

A blower motor is a component within an HVAC system that is responsible for circulating air into the building. It’s the key to maintaining a comfortable temperature and humidity throughout your facility. Blower motors push cold air (in the summer) or hot air (in the winter) through ducts to the desired locations.

What does a bad blower resistor look like?

The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn’t work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.