CaptJon320

2009 rx350

Fan controls stopped working, fan would not turn on. After looking things over, found out that mice had gotten into it (stored for a couple months) and replaced blower motor and resistor and cleaned everything out in the ducting above the cabin filter, put it back together and it worked great for two months. Fan didn’t work again. Replaced resistor again, worked great for another month. Replaced resistor again, worked for 2 weeks. Replaced resistor again and it worked for a week.

The resistor was replaced each time under warranty. I finally tried a different company's resistor and same thing happened. I have pulled the blower motor and bench tested it and it runs fine on 12VDC. Therefore, it must be something upstream of the resistor? However, I don’t know where to start the process.

The first three times it died, it died with the fan off. The last two times it has died, it has died with the fan on high. At least I have some heat with the fan running on high during the winter (live in Minnesota).

I am not a car mechanic, I fly airplanes for a living. I am at a loss for where to head next with this problem. Car runs great, just wish I could get this fixed.

I appreciate any advice.

LeX2K

Test the current draw of the motor. Maybe the parts you are putting in are all coming out of the same factory, meaning no good.

CaptJon320

Okay, I can do that. The car is my son's who lives a couple of hours from me, but next time it is here or I am there I will definitely try that.

So I am clear, test the output that the blower motor is pulling? In other words, test the output to the motor from the resistor​​​​​​?

LeX2K

Test the maximum current the blower can draw, I assume on the highest setting the resistor does nothing. Hope that is a safe assumption.