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(Post Link) post #1 of 6 Old 12-06-06 Thread Starter
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Help Cooling Fan Fuse

My cooling fan fuse has started blowing all the time. Before a spend 120 on a new fan, could it be something else. When the fan is disconnected no blown fuses. Connected fan and disconnected resistor and fuse blows.
I would rather replace a cheap resistor or relay if these are more likely to be the problem. Anyone any ideas?
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Re: Cooling Fan Fuse

Resistors don't normally blow closed (short), they blow open.
I suggest testing the resistor with a multimeter. It should read somewhere between maybe 3 ohms and 30 ohms.
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(Post Link) post #3 of 6 Old 13-06-06 Thread Starter
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Re: Cooling Fan Fuse

Thanks for the reply. Assuming the resistor is O.K., what to check next.
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Re: Cooling Fan Fuse

Well, this'll save me starting a 'my cooling fan fuse blew' thread of my own. At least now I know the high temp warning light works
So far what I've done is:
Removed fuse, disconnected fan motor connector, checked for a circuit between the fuse holder (fan motor side) and earth (battery -ve) in case there was a short circuit in that red wire. - Result OK
Ran engine up to 90 degrees+ and checked circuit between blue/white wire of motor connector and earth, open circuit <90, circuit made at >=90 approx - Result OK.
Perhaps this is over simplified, but it seems to me that the wiring to and from the fan is in order. So the fan itself must be the problem.

The next problem is do I get a s/h one at 60 and stuff it in and hope for the best, or get a new one, though to do the job properly I really need a new radiator as well and whilst the system is drained I might as well change the thermostat which is beginning to show signs of failing, oh, and better do the rad hoses as well.......

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(Post Link) post #5 of 6 Old 13-06-06 Thread Starter
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Re: Cooling Fan Fuse

Oh well, obviously the fan. Wired it direct to the battery a) to make sure it spun up and b) I could leave it running to keep the engine cool while I continued to trace the fault.
Well the fan spun up alright but one of the wires started to melt the insulation so must be a short in the fan. Breakers contacted and fan on the way as I speak. Hope it's not a combination of problems.
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(Post Link) post #6 of 6 Old 21-06-06 Thread Starter
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Re: Cooling Fan Fuse

Well, replaced fan and all O.K. on a 200 mile run. Next day the fuse blows again. Bugger. Gonna try changing the resistor next.
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