Hvac help!!

[Caden]

So I have a 1991 f250 7.3 and the blower motor stopped working a few months back by that time I had already had to replace a couple fuses but I went to replace the fuse thinking it would fix it and the fuse wasn’t blown I took it out then put it back in and it started working on all speeds for a few days and now it won’t work again if anyone has had this problem please help me out i would appreciate it

 

[Oldfrogdiving]

Maybe check the ground on the blower? I dont have A/C but my heater quit blowing it was a loose corroded connection and fairly gunked up ground.

 

[chillman88]

Is it not working at all or only working on high?

If you only have high it's a bad blower resistor.

 

[lotzagoodstuff]

+1 on what chillman said above. If it was me,I’d pull the resistor out of the firewall and inspect it, because it’s free and it’s not that time consuming.