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Old 01-03-2011, 03:10 PM   #1
linksubsea
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heater blower wont work

hy, everyone im new on here, nice to join you all, my ford focus tdi that i have just bought keeps blowing fuses everytime i turn the heater blower on, can anyone help me please?


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Old 01-03-2011, 04:19 PM   #2
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Welcome.
I'm assuming the fan blower fuse is the only one that blows, although you mentioned 'fuses'. Excess current is the reason fuses blow, caused by a short or in your case, probably by a siezed motor. Are you able to remove the motor and check to see if it is free to spin? Excess current could also be caused by damaged wiring or extreme wear on the motor brushes or a faulty motor, or a faulty resistor unit for the speed control (if you have one fitted). Investigation is required.
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Old 01-03-2011, 04:21 PM   #3
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Sounds like motor no good
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Old 01-03-2011, 04:57 PM   #4
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Even if the motor turns, it might not pass an electrical test- test for continuity or ohms between the pins. If you get .01 ohms, or your tester reads continuity- that will tell you that the fan is bad whether it turns or not. Now if you find resistance, like 1-10 ohms, on the motor- you should check for resistance and continuity on the wiring side. Wiring might have been damaged somewhere.
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Old 01-03-2011, 05:02 PM   #5
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Continuity in the motor will not blow fuses. Excess current will.
A siezed motor is one possibility I mentioned, that will cause excess current draw. Worn brushes/damaged commutator will cause excess current. Damaged/faulty blower resistor assemblies are known to cause problems too. Out with the multimeter!
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Old 01-03-2011, 10:45 PM   #6
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^^^ Yes, to the bad resistor packs for the blower motors...Seen many of them burnt out..Also, just make sure something isn't jammed in it... I had an old mustang inhale part of a sock ( long story)
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Old 01-04-2011, 05:30 AM   #7
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Continuity in the motor will not blow fuses. Excess current will.
A siezed motor is one possibility I mentioned, that will cause excess current draw. Worn brushes/damaged commutator will cause excess current. Damaged/faulty blower resistor assemblies are known to cause problems too. Out with the multimeter!
Continuity with no resistance such as .01 ohms= dead short, and yes that will blow a fuse. It's low resistance that causes high current.
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Old 01-04-2011, 11:24 AM   #8
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thanks for your help, will try and let you no how i get on.
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