Click on the link in my signature below and be sure to perform Tips 1,3,4, and 5 thoroughly to make sure that's not part of the problem.
Spark plugs, wires, cap and rotor are due to be replaced every 30,000 miles......Maintenance here....
Or the ground for the blower motor is not good.
G103. Driver's side inner fender. Notorious for having too much paint under the terminal and being held on with an old sheet metal screw. Refresh it.