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Old 08-23-2021, 09:59 AM
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Default Is my blower motor dying?

Need some help from our Pontiac electrical gurus.

Ran my car all weekend here in the Detroit area for Dream Cruise, everything was fine running AC on high. Last night on the ride home AC & blower stopped working. I checked this morning and the 30A fuse from the back of the alternator was blown, replaced it and immediately blew again when I turned on the blower motor switch

Could my blower motor be dying and causing a high current load to be blowing the fuse? Everything else in the car seems to work fine.
Any suggestions where to start looking for problems? Again nothing has changed in my electrical system at all.
thanks in advance

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Old 08-23-2021, 10:13 AM
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is the motor stuck?

George

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Old 08-23-2021, 10:57 AM
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Pull the wire off of the blower motor and see what happens. I call it 50/50'ing something. If it still blows it MAY be your wiring, switch, resistor, etc. If it doesn't, I'd say it's the motor. At least then you'll know whether to turn left or right.

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Old 08-23-2021, 11:07 AM
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Quote:
Originally Posted by george kujanski View Post
is the motor stuck?

George
No, the motor isnt stuck. It will runs for a few seconds before the fuse blows. It doenst make any weird noises like bad bearings or a rusty shaft

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Old 08-23-2021, 12:09 PM
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Does it run well for the short time? if the motor is worn or too much friction, starting current may be high enuf to blow the fuse. Try starting the blower at a lower speed, then switch to high speed to see if it runs then. lower speed settings add xtra resistance to the motor circuit which would reduce the start current.

George

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Old 08-23-2021, 12:21 PM
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Turn AC off and heater on. Try the blower then?
What year of car is it?
Is their also a fuse on the fuse block for blower?
(I'm thinking more along line of AC and/or clutch going out?)



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Old 08-23-2021, 02:09 PM
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Replace the motor, then you know it isn’t that.

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Old 08-23-2021, 03:15 PM
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Quote:
Originally Posted by johnta1 View Post
Turn AC off and heater on. Try the blower then?
What year of car is it?
Is their also a fuse on the fuse block for blower?
(I'm thinking more along line of AC and/or clutch going out?)


This is a 1963 Grand Prix.
It blows the fuse without the AC being on, I tested it with the key on (power) and the HVAC selector in HEATER position, blower on Low.

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Old 08-23-2021, 06:34 PM
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Then I would change the fan blower.



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Old 08-23-2021, 08:49 PM
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yes it seems to blow the fuse at any speed, but not when the blower wire is disconnected. SO I'm 99% sure its the motor. Just didn't want to have to remove & replace it. It's very tight in that area with the AC stuff.

thanks for the help.

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