Question about 2008 BMW K 1200 S

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Radiator issue my radiator fan wont come on.iv replaced temp. switch, off/on switch in radiator. no fuses blown please help

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Has your bike gotten hot enough to need the fan?

Posted on Nov 20, 2008

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I have a 2004 suzuki gs500f when the bike gets hot it won't start tell it cools down and it runs fine


check to see if ur fans on radiator are coming on when bike gets hot,check fan fuse might be blown..coolant ful?might need to flush cooling system,replace thermostat,radiator clogged,completly flush system,replace hoses too all,replace temp sending unit too??

Aug 16, 2013 | Motorcycles

1 Answer

955i runs hot fan will not come on


FIRSTLY CHECK THERE IS SUFICIANT COOLANT IN THE SYSTEM, SECONDLY YOU HAVE A FUSE FOR THE FAN HAVE YOU CHECKED THIS?, YOU HAVE A SWITCH IN THE COOLING SYSTEM NORMALY IN THE RADIATOR THIS SENSES THE WATER TEMP, AND SO ON ACTIVATES THE COOLING FAN, IF THE WATER LEVEL IS LOW THE SYSTEM WONT GET UP TO TEMP, IT MAY BE HOT, BUT THE TEMPRETURE METER READING IS MEASURED IN A DIFFERENT AREA NORMALY AT THE THERMOSTAT AREA, IF ALL ELSE FAILS LOCATE THE THERMAL SWITCH ON THE RADIATOR AND REMOVE THE WIRES AND BRIDGE THEM WITH THE IGNITION OFF, THEN TURN IGNITION BACK ON AND THE FAN SHOULD RUN PERMENENTLY, IF IT DOES THEN YOU KNOW THE REST OF THE CIRCUIT IS OK AND SHOULD GET THE THERMAL SWITCHED CHECKED OUT, AND REPLACE IF NESS.

Oct 29, 2010 | 2001 Triumph 955i Speed triple

1 Answer

My fan wont come on my bike but i straight wired it and it still work and the fuse is some good


THE MOST OBVIOUSE REASON FOR THE FAN NOT COMING ON IS THE LACK OF WATER IN THE SYSTEM, IGNORE THE COOLANT BOTTLE, GO STRAIGHT TO THE RADIATOR AND CHECK FOR COOLANT ASSUMING YOU DO HAVE COOLANT, YOU COULD ALSO DO 1 OTHER TEST.WHEN YOU SAY YOU STRAIGHT WIRED TE FAN, DO YOU MEAN YOU PUT A LIVE FROM THE BATTERY TO THE FAN AND IT WORKED? HAVE YOU TRIED LOCATING THE THERMAL SWITCH LOCATED ON THE RADIATOR THIS WILL HAVE 2 WIRES ON IT, IT ACTS AS A THERMOSTAT WHEN THE WATER GETS UP TO TEMP(IE THE REASON FOR WATER PRESENCE) THE SWITCH ALOWS POWER TO CROSS THROUGH TO THE FAN,, JOIN TOGETER BOTH WIRES AT THIS SWITCH WITH THE IGNITION ON IF THE FAN THEN WORKS AND YOU HAVE CHECKED THE ABOVE I WOULD SUSPECT THE SWITCH IS AT FAULT.BEFORE REPLACING TEST IT USING A MULTI METERE

Aug 30, 2010 | 2003 Suzuki GSX 1300 RZ Hayabusa

1 Answer

I have a 1982 yamaha vision 550 and it over heats iv tested the fan by giving it curent and the fan works fine is there a sensor or fuse that might be the problem


There should be a sensor in the bottom of the radiator that senses the water temperature and turns the fan on when it reaches a certain temperature. There is a sensor somewhere and I'm guessing it's in the bottom of the radiator. Jumper across it and see if the fan runs. To test it, you'll have to connect an ohm meter to it and put it in a pan of water. Slowly heat the water until the sensor changes state. Notice the water temp when this happens.

Jul 20, 2010 | 1982 Yamaha XZ 550

1 Answer

I own a 1984 honda vt 700cc shadow the problem is that the radiator fan wont cut in when engine is hot is there any fuses to the fan motor and where are they or is there a thermostat which is stuck. ...


Most common problem for Honda's is the switch (about $100) Usually it is right on the radiator or in some cases on the radiator cap mounting tube. There are two switches you will find ,single wire is the temp sender, two wire is the fan on/off switch. The two wire switch is the one that usually goes bad. Test the fan motor to make sure it works (rare). New they can run $200-$300.

Jun 20, 2010 | 1984 Honda VT 500 C Shadow

1 Answer

My 2005 Yamaha R6 is overheating at idle...like sitting at red lights.. I wonder if its a temp switch or a blown fuse, or even a wiring problem. Any help?


if your cooling fan is not switching on then i would check fuses then if all fuses are good check for 12V at you cooling fan when temp gets between half and 3/4 way to hot . if you have no voltage it could be a temp sensor or relay . if you have voltage there your fan motor has gone bad and needs to be replaced . another thing to check is the hoses running to the radiator . let the bike idle and warm up and check the temp of the radiator hoses . if one is much cooler than it should be then you might have a bad thermostat on your bike and its not opening enough to let coolant flow at idle. water pump could be going bad as well. if the bike warms up and fan does not kick on untill you rev it up a bit i would check the thermostat and waterpump

Oct 30, 2009 | 2005 Yamaha YZF-R6

2 Answers

1994 honda magna coolin fan wont work whats wrong??


The most common cause is a defective thermal switch (this is what causes the fan to come on when the engine coolant reaches a certain temperature). The switch is threaded into the thermostat housing and has a single wire connected to it. If you simply run a jumper from the wire, to ground - the fan should come on. If so, then the thermal switch is bad. Other possible reasons for the fan to not work are a blown fuse, or a defective fan motor.

Oct 20, 2009 | 1994 Honda VF 750 C Magna

2 Answers

Radiator fan wont come on


hook up a wire directly to the fan from a twelve volt batt. if it come on then the fan is still good.check the sending unit on the bottom of your radiator.drain the fluid out of your radiator.heat up a pan of water to what the sending unit is set to,once the water reaches the correct temp it should activate if not replace it.if money is tight than do what i did install a manual toggle switch,

Mar 23, 2009 | 2000 kawasaki ZX-12R

4 Answers

Radiator fan does not come on, overheating lamp blinks


Disconnect the two fan plugs leads from the fan sensor switch in the thermostat housing bridge the two plugs with a wire if the fan starts then you will need to replace the fan sensor switch if not the fan will need replacing ,as for the temp light flashing with the indicator light maybe because they share the same fuse and they could share a common earth as well?
Cheers Michael

Nov 18, 2008 | 2001 Triumph Triumph Thunderbird

1 Answer

Radiator fan


off/on switch in radiator. no fuses blown please helpHas your bike gotten hot enough to need the fan?,

Nov 10, 2008 | 2004 ATK 500 Intimidator

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