I had a problem with my 08 6.4. I changed the relay, checked wiring, pulled the blower, the whole 9 and couldn't find anything wrong. Mine would quit about 1-2 a month. I'd open and slam the hood and it would kick right on.
Ive been having the same problem. Yesterday it didn't kick on for 10-15 min, it didn't matter what setting it was on it would not blow. I twisted every knob on it an it finally came on, started slow and then took off to hi. I have had this happen several times.
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Hit the housing under the glovebox and see if the fan kicks on, the blower motor is right there. About once every couple of months, mine will do this, a little smack with an open palm and the blower starts right up. I figure at some point it wont restart and I will replace the blower motor.
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