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Old 07-24-2009, 12:26 AM   #1
1st Gear Newbie
Join Date: Aug 2008
Location: Toronto
Posts: 42
Why Cooling fan shorted fuses often?

My 97's 318i cooling fans got this problems many times. When it burned the fuse, it could not cool the radiator and caused the radiator to burst TWICE. I had to replace two radiators already!!!

In April, after it burned the fuse and burst my 1st radiator, I thought it was because the fan's wore out, when it kicked in, the fan's motor held too tight and caused the current to be too high, then burned the fuse. So, I bought an used fan to replace it, which ran much smoothly than the prior.

But last week, it happened again! I firstly replace the original 40A fuse w/a 60A. Then, I took the fan out, plugged it with the battery, both hi & low speed could run and seemed to be pretty good. Then I put them back again and test it. After the temperate's high enough, I smelt something's wrong and saw smoke coming out. I found that fan's motor was burned to red.

What's wrong? I have to check the whole fan circuit? How to do it?
Your ideas will be highly appreciated!
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Old 07-29-2009, 12:32 PM   #2
2nd Gear Member
Join Date: Jun 2007
Location: Ontario
Posts: 79
I blew the fuse for my electric fan because the car had sat for a while and the fan had nearly seized. It drew too much current to get the fan spinning and blew the fuse. New fan, and the everything has been going fine since then.

Maybe you're new-used fan has a similar problem of starting to wear, forcing the motor to use more energy to get it to spin?
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Old 07-29-2009, 12:53 PM   #3
Parts hoarding partner...
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Join Date: Nov 2007
Location: Toronto
Posts: 3,428
yeah, I suspect the same thing; to much current draw causing it to blow fuses and or roast the motor. Get a new fan. Think about it.. If you get used again, sure you save some money in the short run; but it's going to cost you more then the new fan in the long run by trouble shooting and replacing stuff. Do it right the first time and forget about it.!!

good luck.

I think I've had 18 bmw's in 6 years.

1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!
KEEPER 88 5sp Vert 2016
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Old 07-30-2009, 06:01 AM   #4
6th Gear Member
Join Date: Aug 2008
Location: Niagara Region
Posts: 1,796
^^What they said.
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Old 07-30-2009, 01:32 PM   #5
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Join Date: Apr 2003
Location: Kitchener
Posts: 696
That's what she said.
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