Hey Guys,

I've experienced both last winter and this winter a whine that comes from my heater fan when it's on auto mode and only operating at the very slow speed. It's a high pitched whine that's just plain annoying. It seems to only happen once the truck is warm and fan has been on for a solid 30 minutes or greater. Anyone else noticed this? I replaced the cabin filter last Spring and just took it out and cleaned out all the junk again this past weekend. Should I drop the fan and check things out? Maybe a dust build up on the fan becuase it certainly isn't the motor bearings otherwise it would be doing it all the time. Let me know what you think I should do.

 

My 02 taco is simular it is not whinning but sounds like a leaf or something is hitting the blade.
I just turn up the stearo since it is out of factory warrenty.