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dwerbil
Flying Brick Rider
Joined: 18 Jun 2010
Posts: 224
Location: Round Rock, Tx
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 Posted: Sun May 15, 2016 1:19 pm Post subject: 1993 K1100RS cooling issue |
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Noticed the other day while in stop and go traffic that the cooling fan would not come on. Fortunately I was able to get back up to highway speed in a few moment's time to see the engine temp drop back down to near normal range. I replaced the fan with a used one a few years ago. Certainly this fan could have failed just now.
Is there is fan relay to replace or maybe a way to check the fan for operation itself? I'm trying to remember if there's more than two wires involved with the fan to test it. Thermostat malfunction?
Other than this new cooling issue, the bike runs well.
Thanks much for any help.
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93 K1100RS ~ 2004 R1150RT ~ 84 RS ~ 78 R100/7 ~ 65 R60/2
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Randy at Round Rock, Texas |
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Jim
Site Admin
Joined: 17 May 2003
Posts: 3841
Location: WHERETHEFUNNEVERENDS
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| Posted: Sun May 15, 2016 2:00 pm Post subject: |
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Yes - there is a fan relay. The fan has only two wires.
It's been awhile since I've had the fan out - all you have to do is put 12 volts to it - if it runs, it's good.
If you can figure out which relay is for the fan, you can swap out one of the others to see if that's the problem
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Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000
"We shall not all die, but we shall all be changed." |
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dwerbil
Flying Brick Rider
Joined: 18 Jun 2010
Posts: 224
Location: Round Rock, Tx
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| Posted: Sun May 15, 2016 11:02 pm Post subject: |
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Thanks Jim. Will be looking into it in a few days.
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93 K1100RS ~ 2004 R1150RT ~ 84 RS ~ 78 R100/7 ~ 65 R60/2
Click for pics
Randy at Round Rock, Texas |
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bikesnbones
Big Brick Rider
Joined: 03 Aug 2014
Posts: 74
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| Posted: Fri May 20, 2016 1:39 pm Post subject: |
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Don't assume there is a problem.
When I had my RS, I noticed that the fan didn't cut in till the needle was a hairs breadth off the red.
This is quite normal apparently. |
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Flying Duck
PsyKotic Waterfowl
Joined: 27 Jan 2005
Posts: 10102
Location: Bumf***, WA
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| Posted: Fri May 20, 2016 8:58 pm Post subject: |
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| bikesnbones wrote: | Don't assume there is a problem.
When I had my RS, I noticed that the fan didn't cut in till the needle was a hairs breadth off the red.
This is quite normal apparently. |
This.
You probably don't have a problem unless the overheat light in the cluster comes on.
Even then, if you can get the bike up to speed where it turns the light off then you'll be OK.
The "last line of defense" against overheating is that K bikes have a radiator cap that will "blow" (just like a car's) so until that point you are not doing harm to the engine. (If the radiator cap blows then you should definitely pull over ASAP.)
Even then, as the radiator caps age they generally blow more easily. If you're worried about overheating then I'd install a new from BMW radiator cap. It's only a $25 part.
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