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  #1  
Old 05-21-2005, 06:39 AM
yjamous's Avatar
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Question Auxillary fan fuse keeps burning

Hi All
I've Mercedes E220 model 1993. I've a problem with my Auxillary fan. The fuse of the Auxillary fan keeps burning. I went to mechanic to replace the auxillay fan, but no use. The fuse kept burning (I replaced it with a second hand fan).

So, I would appreciate if you can provide me with the reasons that causes this to happen (all possible reasons).
Note: The mechanic says that the fan gets hot after spinning for a while, that's why he judged that I need to replace the fan.

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  #2  
Old 05-21-2005, 07:06 AM
ozzy's Avatar
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Do you own, or can you get access to, a multimeter???
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Old 05-21-2005, 07:17 AM
yjamous's Avatar
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Hi Ozzy
Well, I don't but I can arrange something!!
Now there's another problem, the plastic part of the holder has melt down.
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Old 05-21-2005, 08:49 AM
ozzy's Avatar
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Excessive heat through a fuse holder is usually caused by poor connection/ short or excessive current draw.

My guess would be excessive current draw through the fan, the only other cause would be a short in the power wire that supplies the fan.

You can easily diagnose with the aid of a multimeter, set on ohms scale and with the plug at the fan disconnected you can check for short on the power side and if that’s ok, check the motor for high resistance, It should be less than 5 ohms, ideally 1-3 ohms.
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Old 05-21-2005, 11:13 AM
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Most high amp fan motor draw I run across is not caused by electical failure , but rather, motor bearing drag.
A quick first check is always hand spin fan testing...
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  #6  
Old 05-21-2005, 11:57 AM
ozzy's Avatar
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Well actually,

Electricity is a form of energy which is converted to other forms of energy when it is used to perform a task, and when this conversion occurs heat is always produced to a greater or lesser degree. There is also some heat produced in the wiring connected to the electrical device.

For example electrical energy is converted to:-

- light energy (electric lamp) plus heat

- mechanical energy (electric motor) plus heat

- heat or thermal energy (electric heater) plus infra red radiation

A convenient measurement of the heat produced by electric current flow is Watts.

If a fault develops, the current (and heat energy) can increase to the extent that either the appliance burns out, the connecting wiring overheats and melts the plastic insulation or the plug and socket may burn out. This is where the fuse comes in, designed to blow at its designated amp rating.

tkamiya stated,
Quote:
What is the rating of the fuse in the place?
Wasn't there an update to the rating for this very reason?
Simply putting a higher rated fuse, as stated by tkamiya, will only cause more heat and wont fix your problem.

You need to find out why you have a high amp draw, as arthur has stated either the bearings have failed or as i stated the motor has high internal resistance.

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