Blower motor fuse
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Tuned
Joined: Mar 2015
Posts: 346
Likes: 37
Blower motor fuse
After about 20 minutes of solid use, the fan blower motor fuse (30a) will pop. Sometimes a couple days, sometimes 10 min. I can’t determine yet if the heat being on plays a roll. Is this a bad blower motor? Fuse box looks fine.
Lead Driver
Joined: Nov 2013
Posts: 7,174
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Try running the fan on high speed only. This bypasses the resistor pack (used for lower speeds only) and delivers maximum current to the fan motor.
If you can get the fuse to blow, quickly check if the fan speed switch feels warm to the touch. It should stay cool. If warm, the switch is bad and needs to be replaced.
If the switch stays cool, I’d be willing to gamble your money and reputation on a new fan motor.
One last thing to check: remove the fan motor and check for debris rubbing against the blades. That could make the motor work too hard and blow the fuse.
If you can get the fuse to blow, quickly check if the fan speed switch feels warm to the touch. It should stay cool. If warm, the switch is bad and needs to be replaced.
If the switch stays cool, I’d be willing to gamble your money and reputation on a new fan motor.
One last thing to check: remove the fan motor and check for debris rubbing against the blades. That could make the motor work too hard and blow the fuse.
More Turbo
Joined: Jan 2007
Posts: 624
Likes: 55
Once you get the fuse blowing figured out, put the fan motor on relays, two of them, one for HOT and one for GROUND, switched simultaneously via a toggle-switch = you will be amazed = it will roar like a cyclone and blow your drawers off.
Turn the toggle switch OFF and the fan will return to normal anemic behavior.
Turn the toggle switch OFF and the fan will return to normal anemic behavior.
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
Forgot to ask; Does your truck have factory AC? If so, the AC compressor clutch gets power through the same fuse as the fan.
For troubleshooting, run the system in VENT or FLOOR. In all other positions, the AC is on and load on the fuse is increased. The compressor clutch normally cycles on and off, which might help explain the intermittent nature of the problem.
If the fuse only blows with AC on, that doesn’t necessarily mean the compressor clutch is the culprit. Could still be a bad fan motor drawing a little more current than usual, and adding the normal amp draw of the compressor clutch is just enough to put it over the edge. Further testing would be required.
For troubleshooting, run the system in VENT or FLOOR. In all other positions, the AC is on and load on the fuse is increased. The compressor clutch normally cycles on and off, which might help explain the intermittent nature of the problem.
If the fuse only blows with AC on, that doesn’t necessarily mean the compressor clutch is the culprit. Could still be a bad fan motor drawing a little more current than usual, and adding the normal amp draw of the compressor clutch is just enough to put it over the edge. Further testing would be required.
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Tuned
Joined: Mar 2015
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I was at a family gathering last night and the family member I got it from was there. I asked him about it. It does have what appears to be factory air conditioning, he said he couldn’t get the ac to work, as in the clutch woukd not catch,although it does spin by hand easily
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