on my powerstroke the ac quit blowing the fan will not turn on i tested the fan and it does work just not getting in power checked all the fuses in the cab and under the hood. i was thinking it might be the controls for the a/c the actual 3 piece switch in the dash yes no maybe is there any ways i can test it

 

Does it blow when you put it on number three or the third spot?

 

i noticed it turns on sometimes if i hit a bump and if i turn it on the third setting it blows but really weak but if i bypass everything and put power to the fan the fan runs fine

 

Have you checked the ground it sounds like a bad connection.

 

Sounds like the blower motor resistor took a crap.