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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 09-19-2013, 06:49 AM
dougpaulburdic dougpaulburdic is offline
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Location: cameron
 
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Mein Auto: 2000 z3/2.3
Z3 aux fan resistor value

Does anyone know the ohms value for the aux fan resistor? I keep blowing the fuse to the aux fan. I want to check the resistor value before buying one or replacing the fan.
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  #2  
Old 09-19-2013, 07:19 AM
Blacklane Blacklane is offline
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Mein Auto: 1998 Z3 Roadster
It's somewhere around 0.5 ohms or so and 85 watts.
But that's almost certainly not your problem. The fan high-speed circuit simply shorts around the resistor, so a shorted resistor would just put the fan in high-speed. If the resistor were open, the fan would simply not run in low speed, but would run on high speed.
I think it's most likely that you have a bad fan. They seem to fail regularly. You can get to the connector behind the grill and apply 12v to the fan there. If the fan works, looks elsewhere. If not: replace the fan.
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Old 09-19-2013, 07:25 AM
dougpaulburdic dougpaulburdic is offline
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Mein Auto: 2000 z3/2.3
Quote:
Originally Posted by Blacklane View Post
It's somewhere around 0.5 ohms or so and 85 watts.
But that's almost certainly not your problem. The fan high-speed circuit simply shorts around the resistor, so a shorted resistor would just put the fan in high-speed. If the resistor were open, the fan would simply not run in low speed, but would run on high speed.
I think it's most likely that you have a bad fan. They seem to fail regularly. You can get to the connector behind the grill and apply 12v to the fan there. If the fan works, looks elsewhere. If not: replace the fan.
The fan will work for alittle while before blowing it's fuse. I also am not sure what the fuse value is. Is it 25amps?
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Old 09-19-2013, 07:56 AM
Blacklane Blacklane is offline
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There should be a fuse map inside the lid of the fuse box giving fuse values. There are also several threads here on the topic that you can find using the "Search This Forum" button at the top right.
If you're talking about Fuse 39, I think it's more like 7.5 amps, not 25 amps.
It sounds like you have bad bearings in your fan motor. If a motor is over-loaded, it draws more current, causing it to over-heat. An over-heated motor draws even more current, eventually blowing the fuse.
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  #5  
Old 09-19-2013, 08:06 AM
dougpaulburdic dougpaulburdic is offline
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Location: cameron
 
Join Date: Apr 2013
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Mein Auto: 2000 z3/2.3
Quote:
Originally Posted by Blacklane View Post
There should be a fuse map inside the lid of the fuse box giving fuse values. There are also several threads here on the topic that you can find using the "Search This Forum" button at the top right.
If you're talking about Fuse 39, I think it's more like 7.5 amps, not 25 amps.
It sounds like you have bad bearings in your fan motor. If a motor is over-loaded, it draws more current, causing it to over-heat. An over-heated motor draws even more current, eventually blowing the fuse.
Thanks! Ill check it out.
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