Blower motor running slow...Help!

[obs'r]

About two years ago my blower motor on my OBS burnt up. When I say burnt it filled the entire cab with smoke. I replaced the motor right away and only had power on high. I replaced the resistor and got all four speeds back, but the fan doesn't move much air on high. I have put up with it taking forever to warm up in the winter or cool down in the summer and I am finally tired of it. What should I check next. I have compared my fan speed with another OBS with the factory fan and i would say on high, mine spins a little over half the speed of the factory one. The replacement fan is a napa one and the resistor is an auto zone one.

 

[zilla68]

Mine is the same way, have you checked the speed nut that holds the cage to the motor? I need to chrck mine also

 

[obs'r]

well the replacement motor and fan assymbly came with a metal fan and tuesday i swapped back to the plastic fan and it helped a little but now i just need the motor to speed up.

 

[cmann250]

Hey hey, strange seeing you here.

Could some of the wiring gotten burned up when the blower retired?

Also, take the knob off and see if it will turn a little farther using pliers or something. Maybe the knob and shaft are indexed wrong? Which would not let you turn it all the way. Simple things first.

 

[obs'r]

Im thinking it might be wiring but i dont know where to start checking.