Each ride on your Cadillac Deville should be a fun and a comfortable experience. But when the blower motor is broken, that can't happen. You won't be able to turn on your a/c or heater when this component suddenly gets damaged. You'll suffer from too much heat or cold. If you're wondering what causes the blower motor to fail, you have to get ready to do some troubleshooting. You have to find these culprits immediately to determine what kind of repair procedure you must do.
When the blower motor suddenly stops switching on, the first thing that you must check is the fuse. A blown out fuse impedes the operation of the blower motor and the fan. To confirm the condition of the fuse, you have to take a look at it. Simply open the glove compartment box of your Deville and you'll see the fuse box. If the ceramic end of the fuse looks burnt and black, you need to replace it. Also, you have to inspect the condition of the wires. If you see that the wires are corroded, you also have to replace them. You need to examine the wire connections too if they are loose or not. If the wires are not properly attached into the harness, the blower motor might not work.
You have already confirmed that the fuses and wires are working properly. However, the Cadillac Deville blower motor is still not functioning. In this case, you need to see the blower motor itself and check if it's clogged or dirty. Taking the motor out from the Deville is necessary, to inspect its condition further. Prepare your cleaning materials to remove clogs and other debris. After that, test the blower motor if it's going to work. Reinstall it once you confirmed that it's working efficiently again.
A voltage test is necessary to determine if the blower motor has power on it or if the other components in the motor are grounded. No voltage is an indication that the part is busted. Ground means short circuit in the system. To verify the real cause behind motor failure, you need an ohmmeter. Simply attach its copper terminals on these key parts: fan, resister block, and resister. Observe the voltage readings. Replace any component that shows no voltage at all.