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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 01-15-2010, 05:13 PM   #1 (permalink)
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Fan stays on, even after car turned off

I have a 97 540i and love the car. The problem is the fan stays on after I turn the car off and this kills the battery. I have the heat and ac both turned off but once in a while they spontaneously come on and stay on a few minutes or more then stay on when I turn the car off.

Any ideas?????????
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Old 01-15-2010, 05:25 PM   #2 (permalink)
OMFG another one!?
 
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It could be a sticking switch or relay. You may be able to find them at Realoem.com
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Old 01-15-2010, 05:30 PM   #3 (permalink)
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Im kinda clueless do you know which switch or relay it might be?

Thanks
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Old 01-15-2010, 05:40 PM   #4 (permalink)
OMFG another one!?
 
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Most likely it's a thermostat swich that turns the fan on at a certain temperature. There's usually also a switch that forces the fan(s) on any time the A/C is turned on.
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Old 01-15-2010, 06:01 PM   #5 (permalink)
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Thanks now I have to find that, I said I was clueless. Kinda odd considering its been in the 30s here that the AC would come on. thanks though.
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Old 01-15-2010, 07:07 PM   #6 (permalink)
OMFG another one!?
 
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Well a bad switch wouldn't care about the A/C on or off or about the temp...
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Old 01-15-2010, 07:16 PM   #7 (permalink)
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I have the same issue. Very frustrating, the thing has a mind of its own. My mechanic says it's the final stage unit. You might want to look at that. I bought one from eBay to put in myself.
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Old 01-15-2010, 07:32 PM   #8 (permalink)
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and that did not fix it?
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Old 01-15-2010, 08:15 PM   #9 (permalink)
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I don't know yet. Just got it in the mail today. Just in time for weekend tinkering. He was certain enough to offer to order the parts and schedule me in. I told him I'd take a crack at it. In the past two weeks I've done valve cover gaskets, water pump, oil separator, and yesterday, the cooling system. Oh yeah, three weeks ago, a fan clutch. He has enough of my money for right now. Love the car and the drive so what can I do?
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Old 01-15-2010, 08:17 PM   #10 (permalink)
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Im with you and I hope it works. Mine has 150k miles and is the best car I have ever driven.

Mind if I ask what the unit costs, approximately.
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Old 01-15-2010, 08:54 PM   #11 (permalink)
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Same here. Owned a 733i and a 525i, but the power in the 540i is incredible.
I paid $38 and change with free shipping. If you go that route be sure to check p/n at realoem.com. My '97 has 133k, my '99 has 158k. Wouldn't trade either of them.
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Old 01-15-2010, 09:05 PM   #12 (permalink)
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thanks but I cant find it...I really am cluless, have a link?? you will be in my will if you do. thanks
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Old 01-15-2010, 10:31 PM   #13 (permalink)
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No link, but go to eBay.com and type e39 final stage into the search. They'll come up and you just have to be sure to pick the right one. Very easy!
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Old 01-15-2010, 10:57 PM   #14 (permalink)
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thanks but I cant find it...I really am cluless, have a link?? you will be in my will if you do. thanks
Have you tried the realoem.com site?
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Old 01-15-2010, 11:45 PM   #15 (permalink)
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thanks 42, found it $38 like you said. Now I have to figure out if I can install it.

shark I could not find it there.
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