What to do about the infamous Jeep blower motor problem?
IF the voltage disappears from any setting, you should check the ATC connector on the back and make sure its connected properly. IF the voltage is only present at the highest setting, the resistor block (blower module) would also be at fault. Confucious says: Don’t eat the snow where the huskies go! Ah yes — the Infamous Blower Motor Problem!
Is there a problem with the blower motor?
If there is a battery voltage, the problem would be the blower motor. IF the voltage disappears from any setting, you should check the ATC connector on the back and make sure its connected properly. IF the voltage is only present at the highest setting, the resistor block (blower module) would also be at fault.
What happens if a heater blower has no power?
A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.
What happens when a blower motor resistor fails?
The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.
What causes a blower motor to stop working?
In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.
What are the symptoms of a bad blower motor relay?
3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.
Why does my Jeep Wrangler heater stop blowing?
Most of the time when you lose all speeds at the same time it is a melted/overheated connector at the 3 wire connector on the mode selector switch. Here is a link to a troubleshooting procedure for the complete HVAC blower circuit.
How does a blower motor work in a car?
Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.