Blower fan 1977 cs1

[markee]

Only the fast speed works on my heater blower fan, the switch is new and the wiring seems sound, could the fault be with the fan motor unit? I have not removed the motor for inspection yet but does anyone know if the motors are often at fault?

[So Cal Mark]

if the motor runs on high, it's okay. Look at either the switch or resistor

[markee]

ah thank you, I assume the resistor sits on the back of the motor?

[mbouse]

always check the easiest thing first.

the switch is right there, out in the open. pry it out of the console and by-pass the switch from the hot wire to one, then the other wire. you most likely will get high and low fan speeds.......replace the $6.50 switch.

much easier than tearing out the fan motor and locating a resistor.

i bet lunch it is either the switch or the wiring and not the motor or resister.

[markee]

Ok ...... guess what.........it's a faulty switch !

[rlux4]

Mike, does your hat have the expandable band? Or will you have to buy a new one in a larger size?
Nice call.
Ron

[mbouse]

pre-computer cars are fairly easy to diagnose electrical issues. add a computer and i walk away, shaking my head.

ALWAYS suspect a faulty ground, and ALWAYS try the easiest things first. if it was designed to move (switch) it has prolly failed after 30 some years of rocking back and forth.

[So Cal Mark]

those blower switches are so cheap, 30 minute life is more likely than 30 yrs