heater fuse keeps blowing

[the_legend_1981]

I went out and started my truck tonight and there was no heat blowing out. I checked the fuse...blown.  I changed it, it blew again. I'm thinking blower motor is gone, any ideas? 78, glass fuses

[the_legend_1981]

connected it direct...blower not blowing...

[VileZambonie]

What do you mean connected it direct? Be careful, if it's shorted you'll burn the house down. You can simply unplug the ppl wire at the blower motor and replace the fuse. Then see if it blows, if it doesn't you kow the motor is shorted and needs to be replaced.

[the_legend_1981]

if something is stuck in there the fuse will blow right?

[VileZambonie]

With an electric motor when mechanical resistance increases so will current flow, also contrary to ohms law in a conventional electric circuit, with electric motors when voltage decreases current draw will also increase. So it is possible however just do a quick test like said above and if it passes, take the motor out and inspect. Do you have a digital meter?

[the_legend_1981]

i cleaned the nest out and put it back in...the blower turns on now but slows down and kills the fuse

[VileZambonie]

yeah just replace it, they're cheap anyway, just keep in mind it won't come with a new squirrel cage. If your truck has an AC heater box I have a good one in stock you can have

[the_legend_1981]

no ac, thanks

[the_legend_1981]

put a new blower motor in blew a fuse

[VileZambonie]

Are you talking about the 25A fuse from the junction block? If you unplug the blower motor connector and the circuit is fine but when you hook up the blower motor connector the fuse blows, then you have a defective motor. Did you get a new one or a used one?

[the_legend_1981]

new