Your AC won’t work properly if the blower motor is faulty, and this can be concerning.
If you’ve just discovered that the blower motor in your 2003 GMC Envoy is faulty and you are looking for tips to fix it, this post is your go-to resource.
Keep reading to learn about the causes of this problem and how to fix it yourself.
What Causes GMC Envoy Blower Motor to Stop Working?
Several issues can prevent your GMC Envoy (2003 Model) blower motor from working. These factors include a blown fuse, a faulty relay, and broken wires. A bad blower motor resistor and a dead climate control unit can also cause the blower motor to stop working.
Let’s head over to the troubleshooting tips.
How to Fix a Faulty Blower Motor in the 2003 GMC Envoy
Replace Your Blower Motor Relay
If the blower motor in your 2003 GMC Envoy isn’t working, the blower motor’s relay may be bad.
Your blower motor relay turns on/off your relay. So, if your relay goes bad, the blower motor will stay off.
To fix this issue, you’ll need to replace your blower motor relay. But first, confirm that the relay is bad.
Locate your blower motor relay in the fuse box underneath your hood or in the fuse panel below your steering. If you can’t identify your blower motor relay, study the wiring diagram on your owner’s manual. Your owner’s manual will show you the exact location of your blower motor relay.
Here’s how to do that:
- Disconnect the negative battery terminal. Then remove the blower motor relay from its terminal.
- Search for a relay with a similar amp rating.
- Once you find this relay, unplug it from its outlet.
- Now, connect your blower motor relay to the other relay’s terminal.
- If your blower motor relay doesn’t work while plugged into the other relay’s terminal, it is probably faulty.
- Once you’ve confirmed that your blower motor relay is bad, change it.
Now turn on your car and check if your blower motor is working. If the blower motor doesn’t work, continue to the next tip.
Change Your Blown Fuses
Another reason your GMC Envoy blower motor may fail to work is a blown fuse.
When a fuse gets blown, your car develops a short circuit. As a result, all the electronic devices in the vehicle, including the blower motor, may not receive power. Your blower motor can’t work without power.
First, search for your fuse boxes. One of your fuse boxes is located under the hood, while the other box is placed below your steering wheel.
Then check if there are any blown fuses in the fuse boxes. You can do this by pulling each fuse out of your fuse boxes and holding them against the light. If you find a broken metal strip in a fuse, the fuse is blown.
Replacing the blown fuses in your car might fix your blower motor. Make sure the replacement fuse has the same amperage and color as the old one.
If your blower motor fails to work after you’ve replaced the blown fuses, move on to the next step.
Replace Your Blower Motor Resistor
A dead blower motor resistor can cause the blower motor in your 2003 GMC Envoy to stop working. This is because the resistor controls the speed of the blower motor.
When your blower motor resistor dies, the blower motor may turn on, but it won’t move. This might get you to think the blower motor isn’t working.
You can check if you have a bad blower motor resistor by testing it with a multimeter. To start this test, remove the connector plugged into your blower motor. Then, insert the probes on your multimeter into the connector and turn on your AC fan.
If the multimeter doesn’t detect any volts, or if it only indicates volts at one fan speed, the resistor is dead.
You can solve this problem by replacing your blower motor resistor.
The items you need to replace your blower motor resistor are a 7mm socket and a 7mm ratchet.
Follow these steps to replace your blower motor resistor in your 2003 model GMC Envoy:
- Locate your glove box on your passenger-side dashboard.
- Use your 7mm socket and ratchet to remove the screws on the panel below your glove box. Then slide the panel out.
- You’ll see your blower motor resistor behind the panel.
- You may find two connectors linked to the resistor.
- Squeeze and pull the connector on the resistor to unplug it.
- Trace the resistor’s wires to find the second connector.
- Remove this connector too. Next, pull out the screws on the resistor with your 7mm socket and ratchet.
- Remove your blower motor resistor. Then get the new resistor and insert it into its outlet.
- Re-install the screws and connectors on the resistor.
- Re-insert the panel you removed earlier and drive in the bolts.
Now, turn on your AC and wait for the blower motor to work. If the blower motor doesn’t work, try the next tip.
Change the Connector on Your Blower Motor
Broken wires can also prevent your GMC Envoy blower motor from working.
Sometimes, water leaks into your car when it rains. If the water spills onto the blower motor’s wires, the wires will become rusty. Rusty wires often lose their ability to collect and deliver power supply.
If your blower motor’s wires don’t supply power to the system, it will stop working.
Study your blower motor’s wires for signs of rust. If there is evident corrosion on the wires, the wires might be broken.
To fix this issue, you’ll need to change the connector on your blower motor.
The tools you need for this replacement are a 7mm socket, a 7mm ratchet, a pair of pliers, a wire stripper, a soldering iron, and black tape.
Here’s how to replace the connector on your 2003 GMC Envoy blower motor:
- Locate the kick panel on your passenger dashboard.
- Remove the bolts on the panel with a 7mm socket. Then pull the panel and slide it out.
- You’ll notice a group of wires.
- Your blower motor is hiding behind these wires.
- Pull these wires to the side to find the blower motor.
- Once you find the blower motor, squeeze and pull the connector on the device.
- Next, use a pair of pliers to cut off the connector.
- Get your new connector.
- If you discover that the wires on the connector are too long, trim off a small piece.
- Next, use a wire stripper to remove some of the insulation on the connector and blower motor wires.
- Place the connector’s wires on top of the blower motor’s wires and twist them together.
- Solder the joint with a soldering iron.
- Wait for the soldered joint to cool down.
- Finally, cover up the joint with black tape to protect it.
If your blower motor doesn’t work after this, try the next tip.
Related: Tips to Reset GMC Cars AC.
Replace Your Blower Motor
If you haven’t fixed your blower motor by now, the blower motor is likely dead.
But don’t be in a hurry to change it. For all you know, another issue might be forcing the blower motor to stay off.
Before replacing your blower motor, you want to check if the device is faulty. The quickest way to do this is to observe the sounds your AC makes when you turn it on. If you hear strange noises from the dashboard immediately after turning on your AC, you might have a dead blower motor.
That said, a bad blower motor isn’t the only reason your AC might make weird noises. You may also hear these sounds if your blend door actuator is faulty.
A more effective method is to test the blower motor with a multimeter. You can do this by connecting the probes on the multimeter to the blower motor’s connector. If the multimeter detects 12 volts when the blower motor isn’t working, your blower motor is dead.
Another way to test your blower motor’s health is to connect the device to a 12-volt battery using an alligator test cable. If your blower motor doesn’t spin after you’ve connected it to the battery, the device has gone bad. As such, you’ll need to replace it.
Take the following steps to replace the blower motor in your 2003 GMC Envoy:
- Locate the bottom panel on your passenger-side dashboard.
- Remove the screws on the dashboard with a 7mm socket.
- Pull out the panel. Search for your blower motor behind the panel.
- Unplug the connector from the blower motor. Next, use your 5.5mm socket to remove the bolts on the blower motor.
- Take out your old blower motor and insert the new one. Then drive the screws back into the blower motor.
- Plug the connector back to the blower motor.
- Slide the bottom panel back into place.
- Re-install the bolts of the bottom panel and close it.
Replace Your Climate Control Unit
A bad climate control unit is another possible culprit behind your inactive blower motor.
Your blower motor resistor determines how fast the blower motor should run based on your fan’s speed. The resistor receives this information from the climate control unit.
If your climate control unit is faulty, it may inform the blower motor resistor that the fan is off when the fan is still working. In return, the resistor will prevent the fan from moving.
If your blower motor doesn’t work after you’ve tried all the tips above, your climate control unit might be dead. The only way to fix this issue is to replace the unit.
Hire a professional to replace your climate control unit.
One of the tips above should fix your blower motor. Determine which solution you need to apply and follow them as I’ve instructed.
If your blower motor fails to work after you’ve exhausted these tips, contact your dealer for further assistance.