Is this common, Should I check the switch or is it a fuse, or do the heaters go out. Had to tackle this issue in my RR so not sure where to start. Previous owner said it was intermittent, but I get nothing.
Assuming you've already "jiggled" the controls and eliminated them as a problem...
It could be water in the blower motor, as in my case. Is the fuse blown? If so then:
open the hood and disconnect the plug to the blower
replace the fuse
work the switch and see if you get power at the plug
check the blower for resistance
If you reconnect the plug and blow the fuse again then I would look at removing the blower and checking for water. It is a pain. No need to remove hoses, just flip the whole assembly up (remove the hood, much easier) and unscrew the motor.
Spray the blower motor with WD40 and let it dry completely. I drilled extra weep holes at the low point and even removed the rubber drain valve before the blower; it just collects crap and clogs up quickly.
Aaron ,I am sure you know that the blower motor does not turn on until the last two indents of its range. When i bought my truck , I didnt know that the first few indents only allow for ram air flow. In any case the lever is weak and bends way to easily. JP