The blowers are part of the HVAC system in your Chevy Colorado, and are what blow hot or cold air out of the AC vents. If it breaks down during use, the air will not be able to flow out of the vents to cool your car.
Some reasons why your AC blower motor will not start is because a fuse has exploded, a bad relay has fried, or a module has a bad connection and a damaged control module. Also, a ruined relay can cause an overheating problem and a fried relay can cause a fried relay to cause a ruined control module. Sometimes a weak or unusable connection to an electric wire or a failed relay may cause the motor to stop blowing air.
AC blowers in Chevy Colorado cars need electricity to operate. If there is a blown fuse, the motor will not start because the circuit will be cut and the motor will not work.
How to Fix
To determine the precise placement of the fuse for the blower motor in your Colorado, see the owner’s manual or the cover of the fuse box. Replace the blown fuse with a fresh one that has the required amp rating.
Use a fuse puller or needle nose pliers to remove the fuse from the fuse box, then hold it up to the light to see whether it is working. The fuse has blown if the metal strip is torn in half in the middle. You must swap it out for one with the same amperage and corresponding color. It makes no difference which way you enter the fuse.
Relays allow you to turn certain electric loads on and off by means of an equidistant magnetic signal. Bad relays are another common reason that blower motors in Chevy Colorado are not working properly.
How to Fix
The blower motor relay location for your specific Colorado model should be your first step. The owner’s manual for your car may have the details. Relays are typically found under the left side of the steering wheel or in the engine compartment. The wiring diagram might be drawn on the facing, if you’re lucky. By switching it out for other relays in the fuse box with a similar amp rating, you can test the relay. But it’s strongly advised to unplug the car’s battery before you start the replacement.
Control Module or Bad Resistor
The purpose of having a blowers motor resistor is to allow you to regulate the speed of blowers motors. When the air conditioning system in a Colorado is set to run at a higher speed, it causes the resistor module to force the blower motor to start working again. When one of the resister modules in a motor stops functioning, the motor will stop blowing air.
How to Fix
If you’re not sure which part is bad, it’s best to take your car to a mechanic. But if you’re willing to do some troubleshooting on your own, you can check the resistance of the resistor module against a known good one. You can also replace the control module if it’s faulty. To do this, remove the instrument panel cover and locate the module under it. You’ll need to remove several screws to get at it. Once you have it in your hands, you can look for broken or melted wires, or scorched insulation. If everything looks okay, replace the module with a new one of the same make and model.