Hi and thanks for using 2CarPros.
If the resistor was bad, it would not work on and off. Usually, a bad resister will allow the fan to only work in high speed and no other. Now, is the fan making any noise which would lead you to believe there is a problem with bearing or the motor?
What I would suggest is this. It does sound like the fan is bad based on your description, but to be sure, when it fails to work, check to see if there is power to it and make sure it has a good ground.. If there is power to it and it has ground, but it still isn't running, the motor is bad,
Take a look through this link:
I did find a technical service bulletin related to the blower motor. I had to add them as pictures. See pics 1-3
Here are the directions for removal and replacement of the motor if that is what you need to do. The remaining pictures correlate with these directions.
1. Disconnect the ground cable from battery. Ref. to NOTE > NOTE
For the 12 volt engine restart battery of HEV model, disconnect the ground terminal from 12V engine restart battery sensor.
2. Release the clips, and remove the under cover assembly - passenger.
See picture 4
3. Remove the blower - motor.
(1) Disconnect the connector.
(2) Remove the screws and detach the blower - motor.
See picture 5
Install is revers of removal
Here is a test to determine if the motor is bad. Picture 6 shows pin connectors to the motor and which one gets power and ground. You will need to provide battery power to perform this test.
1. Check the motor operation when battery voltage is applied between the terminals of motor.
Connection diagram see picture 6
Connect battery to the terminals
2. If it does not operate normally, replace the blower - motor.
Let me know if any of this helps or if you have other questions.
Images (Click to enlarge)
Saturday, January 12th, 2019 AT 9:15 PM