I've got an '07 S4RS. While in Daytona this past week, it may have been cold, but the traffic was atrocious, as usual. This was causing my Temp to soar to 228 regularly. At one point I looked down at my left side fan & noticed it wasn't spinning. I gave it a couple flicks with my fingers and it began to spin. I then looked at the right side fan & it too was spinning. Later I noticed both fans had stopped. I tried flicking the left one, but it seemed to have seized? It was. and still is, frozen solid & won't budge! The right side fan spins freely with my fingers, but never comes on when the engine is hot?
Are these two fans linked in series? I can't understand what's going on here? I've already purchased a used fan on eBay to replace the seized one, but was wondering if anyone here has any experience with this? Thanks guys!
I noticed last year that neither of my fans work. Temps reaching about 220 in stop n go traffic. I never really gave it much thought since I spend little time in traffic. but it was a bit worrisome.
Sorry, no help here except to say that the wires running to the left and right fan are different colors suggesting that they may not be in series.
I removed one of my fans last year. When summer rolls around, I do my best not to get stuck in traffic.
I'm pretty sure I read here somewhere that the left fan comes on first then the right if the temp continues to climb.
Naturally it's controlled by a sensor and the ecu.
You may have more than one problem, or simply a bad fan motor.
They are set up to run as DP described.
DesmoTimes sells a kit that has better fan blades, and also a switch that allows you to manually bring the fans on - But the fan blades won't work on your bike :(. But the point of the comment is, it is not unheard of it install a manual override for the fans on a Duc
is 228° all that bad? my bike pretty much runs around 220° in the summer...
Quote from: ducpainter on March 11, 2010, 04:30:20 AM
I'm pretty sure I read here somewhere that the left fan comes on first then the right if the temp continues to climb.
Naturally it's controlled by a sensor and the ecu.
You may have more than one problem, or simply a bad fan motor.
Yes, the left fan motor is definately seized, it won't budge, no matter how hard I try to get it to turn. I've never seen bearings on an electric motor seize to this degree? Funny, because initially, it was just not spinning, until I gave it a twirl. It then seemed to work fine, noislessly, until I noticed it stopped all together!
I bought a used fan on ebay & am going to do an over-ride with a lighted switch.
Desmoquattro and Testastretta fans are different, the 'bolt pattern' that goes through the radiator is not the same.
'01 and '02 S4 fan wiring is different.
AFAIK '02 S4 and Desmoquattro S4R are the same wiring.
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Quote from: corey on March 11, 2010, 07:02:36 AM
is 228° all that bad? my bike pretty much runs around 220° in the summer...
The bikes in question are water-cooled, yours is air-cooled.
Fortunately, I bought a used fan from a 2007 S4RS, the exact same make, model & year as mine, so I'm hoping I'll be OK?
Should be fine.
Quote from: Speeddog on March 11, 2010, 02:58:54 PM
The bikes in question are water-cooled, yours is air-cooled.
yea, i've got that part down... i guess i'm not aware of the heat tolerance differences between the two?
is the 4-valve water cooled motor not able to handle 230°?
Quote from: corey on March 11, 2010, 07:02:36 AM
is 228° all that bad? my bike pretty much runs around 220° in the summer...
Not for the engine as long as the coolant pressure cap is working, but every extra degree sucks when the fans come on and direct the heat towards you.
is there a way to install bypass switch to turn the fans on manually so you can start cooling before it reaches an ungodly temp?
Yes, you can set 'em up with a switch.
But then you've got to *remember* to keep an eye on the temp.
IIRC, your '01 S4 has a fan relay.
Not completely sure.
'02 S4 has the fans powered directly by the ECU.
Pretty sure the Desmoquattro S4R are the same way.
Testastretta likely as well, but I've no info to back that up.
I think you are right sir! I found this on Ducati.ms that has a handy pdf....it seems pretty basic.
http://www.ducati.ms/forums/showthread.php?t=9290 (http://www.ducati.ms/forums/showthread.php?t=9290)
From my understanding of how the fan sytem is set up on an SBK, I can see that system working on an SBK.
AFAIK, the SBK's use a thermoswitch.
Monster S4 and S4R have the fans controlled by the ECU, which is deciding when to turn the fans on based on readings from a thermosensor.
The ECU also uses the thermosensor data to adjust mixture.
So you can't just 'short' the thermosensor like that to turn the fans on.
Well, you can, but it'll fark the mixture.
I could be wrong.
My thought is that I would keep the present system intact and just tap into the wires after the fan relay to complete the circuit. Thus if i forget to turn on the fan manually it will still kick it on @ 216 or whatever it's rated at
Quote from: djrashonal on March 11, 2010, 09:08:27 PM
My thought is that I would keep the present system intact and just tap into the wires after the fan relay to complete the circuit. Thus if i forget to turn on the fan manually it will stick kick it on @ 216 or whatever it's rated at
If the '01 S4 is as I remember, with a fan relay, I think you'd be safe doing that.
My '01 S4 wiring diagram isn't at hand right now....
Quote from: djrashonal on March 11, 2010, 09:08:27 PM
My thought is that I would keep the present system intact and just tap into the wires after the fan relay to complete the circuit. Thus if i forget to turn on the fan manually it will stick kick it on @ 216 or whatever it's rated at
That's what I had planned on doing, running a completely seperate not line from a switch to the fans themselves, having the ability to turn on both fans at once, manually, but hoping the whole thermoswitch, thermosensor thing will continue to function as normal.
Am I correct in assuming this is doable?
Don't know if the S4RS has a fan relay(s), likely not.
Not sure if the ECU would like independently supplied 12V on that circuit.
Quote from: CCEMN1 on March 12, 2010, 05:56:15 AM
That's what I had planned on doing, running a completely seperate not line from a switch to the fans themselves, having the ability to turn on both fans at once, manually, but hoping the whole thermoswitch, thermosensor thing will continue to function as normal.
Am I correct in assuming this is doable?
I'd be leery of feeding 12V to the fan and leaving the factory wiring going back to anything but a relay.
Ecus have been known to get finicky about voltage and which way it comes at them and the relay would act as a buffer of sorts.
Quote from: Speeddog on March 11, 2010, 09:13:08 PM
If the '01 S4 is as I remember, with a fan relay, I think you'd be safe doing that.
My '01 S4 wiring diagram isn't at hand right now....
I've looked at the s4 book i have but the wiring is generic and not labeled. is there something out there that can confirm this?
The printed OEM Owner's Manual will have a wiring diagram, as will the OEM Service Manual.
So, If I disconnect the fans from their existing connections, and just run a mechanical 30 amp switch solely controling them, do you think this will create any problems with the ECU & mapping?
Quote from: CCEMN1 on March 12, 2010, 11:01:46 AM
So, If I disconnect the fans from their existing connections, and just run a mechanical 30 amp switch solely controling them, do you think this will create any problems with the ECU & mapping?
I'd still use a relay and I doubt you need a 30 amp switch, but as long as you leave whatever sensor the ecu uses to determine temp connected I don't see a problem. The ecu doesn't know if the fans are running, just that it has supplied voltage to them.
You guys have got me nervous about this now, so I think I'll just install the new fan & call it macaroni.
I was just concerned that the coolant Temp was up to 228 with NO fans on at all, and was concerned there was a sensor, or switch problem. Now I'm thinking it may have had something to do with the failing left fan? So, I'll wire it up stock at first and see what happens.
I just don't like hot motors, I know how it shortens the life of everything from oil & bearings to pistons & rings! This is also why I don't like the two valve, air cooled Monsters, it's like taking a giant step backwards into Harley technology!