Question about 1998 Honda CBR 900 RR Fireblade

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Hi,how can i check that my coolant fan is working ,it got to 100 degrees and it didnt cut in ,thanks

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  • Honda Master
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Take the two wire of the fan from the connector block and put a live to one and a negative to the other if it doesn't turn around try and spin the fan with your hand if it still don't spin then the fan is knackered, if it does spin then the live feed from the fan relay/fan switch is missing or the earth is bad.

Posted on Jan 17, 2015

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I have a 1998 honda cbr900rr. The bike got over 130 and the fan still didnt turn on. What might be the issuse for this?

Posted on Jan 17, 2015

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With the honda cooling fan it is best to remove the wire from the temperature sensor located at the side of the radiator about the size of a 10p piece with a spade type wire fitting. Earth that wire to the bike frame/engine (use additional wire if required) the fan should start immeadiately if it is working correctly. Reason for this is the sensor creates an earth to the radiator when it gets over heated creating a circuit for the live feed and earth via the frame through the radiator temperature switch. (you will have just created this senario by earthing out the wire)

Posted on Feb 22, 2010

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  • Master
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The fan wont cut in till the engine is very hot,,, well over 100 degrees near to 120! if you realy wont to test the fan out pull the bike up on its stand and leave it ticking over,,, it should take forever before the fan kicks in,,,my bmw has only ever switched the cooling fan on once in 3 years!!!! and that was after standing with the motor running in a traffic jam for 35 minuets !!! but if you wont to find the temp switch pull the plug off the switch and short the two plug pins out with some wire that will start the fan up,,,watch your fingers,,,you only get 5 free fingers on each hand with each body,, and there are no spare parts going cheep?

Posted on Feb 06, 2010

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1 Answer

Radiator fans not working on a 99 dodge Grand Caravan


Hi there:
The engine coolant temperature sensor is a variable resistor with a range of -40 degrees F-265 degrees F (-5 degrees C-129 degrees C).


The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.


When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.


The engine coolant temperature sensor is also utilized for control of the cooling fan.


7_19_2012_5_08_13_pm.gif

Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines



Check this test procedure:

  1. Turn the ignition switch to the OFF position.
  2. Detach the coolant temperature sensor electrical connector.
  3. Using a DVOM set to the ohms scale, connect one lead to terminal A and the other lead to terminal B of the coolant temperature sensor connector.
  1. With the engine at normal operating temperature, approximaterly 200 degrees F (93 degrees C), the ohmmeter should read approximately 700-1000 ohms.
  2. With the engine at room temperature, approximately 70 degrees F (21 degrees C), the ohmmeter should read approximately 7000-13,000 ohms.
  3. If not within specifications, replace the engine coolant temperature sensor.
  4. Test the resistance of the wiring harness between PCM terminal 26 and the sensor wiring harness connector. Also check for continuity between PCM connector terminal 43 and the sensor wiring harness connector. If the resistance measures greater than 1 ohm, repair the wiring harness as necessary.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 18, 2012 | 1999 Dodge Grand Caravan

1 Answer

01 yamaha r1 overheating at idle on hot day, but fans are working?


Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
7. Engine idling too long or bike moving too slow.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Overheating problems on 99 R1
http://www.r1-forum.com/forums/4-mechanical-help/281648-2000-r1-overheating.html
2000 2001 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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Audi a4 1997 keeps overheating after bout 10miles (raises upto 100-110 degrees) Checked fan and still working and water circulating fine so could u provide any support in whats causing the problem?


can be loosing water or not holding pressure[coolant bottle or cap],top gasket,crack in block,oil cooler leaking into coolant,faulty heat gauge or sensor.hope this helps

Jul 06, 2011 | 1997 Audi A4

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My 2005 cobalts cooling fan only comes on when the a/c is one. i have a new fan, thermometer and my water pump is not leaking out water so i doubt its the water pump.


SOUND LIKE ENGINE COOLANT TEMPERATURE SENSOR OPEN OR BAD.HAVE THE ECT SENSOR CHECK WITH CODE SCANNER SEE IF ENGINE COOLANT TEMPERATURE SENSOR READING TEMPERATURE RIGHT.IF ENGINE COOLANT 200 DEGREES AND SCANNER SHOWS 80 TO 100 DEGREES YOUR ECT SENSOR BAD.

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Engine cooling fans don't come on


COOLING FANS DONT TURN COULD BE FAULTY FAN RELAY.FAULTY PCM AND FAULTY COOLANT TEMPERATURE SENSOR.CODE SCAN FOR FAULTY PCM CODE AND A FAULTY COOLANT TEMPERATURE SENSOR.SEE IF ENGINE COOLANT TEMPERATURE SENSOR IS GIVING CORRECT COOLANT TEMPERATURE USING A CODE SCANNER.IF ENGINE IS 190 DEGREES AND THE ENGINE COOLANT TEMPERATURE SENSOR READING 100 TO 80 DEGREES COOLANT SENSOR IS BAD.HOT WIRE COOLING FAN TO SEE IF FAN MOTOR WORKS.BECAUSE COOLING FAN MOTOR COULD HAVE OPEN CIRCUIT CAUSING ELECTRIC MOTOR NOT TO TURN ON.

May 13, 2011 | 2003 Dodge Stratus

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2008 R1 cooling fan not working even at over 103 degree centigrade. Have check: 1) Fan fuses- ok 2) Fan relay- ok 3) Bypass the relay, the fan is working 4) Ignition fuse- ok 5) temp sensor- ok 6)...


I have a 2002 ducati monster S4, it's fans come on at 212 degrees F, that is about 108 degrees C, They only come on in city traffic, and they have only come on twice in 8 years. Your coolant boils at 265F in a closed system, so depending on what the thermostat is set at, they are probably just getting ready to come on at 103. I kinda wish I had a switch that I could turn them on at any time, so it sounds like your bike is running normal, also, my bike runs at exactly 100 degrees hotter than the outside air temp, always. Hope this helps.

Jul 29, 2010 | Yamaha YZF-R1 Motorcycles

1 Answer

1997 pontiac grand am coolant fan not coming on when it needs to. Put new relay on as well. fan does work. what to do next?sometimes it will be on and also stay on but when car cuts off and go to cut back...


coolant fan should kick on when engine coolant reaches 190 to 200 degrees.the coolant temperature sensor resistance will drop.closing contacts allow the pcm to signal or turn on coolant fan.if coolant temoerature sensor is open or bad the coolant fan will not turn on.need to replace it.

Jan 01, 2010 | 1997 Pontiac Grand Am

5 Answers

Overheating 1992 acra integra


The coolant temp sensor tells the computer tempurature of engine at all times.It tells the coolant fans to come on,and also very important,when to cut off.If the fans don`t go off by them selfs,then temp is not going down.Now this is if the ac is off,cooling fans come on any time ac is turned on,so check for fans coming on and off with ac off.A bad coolant sensor would cause the fans not ot come on,but not to cut off nessasaralyCoolant systems must be bled of air trapped in systemfor the engine to be cooled .If air is in the system,the coolant won`t flow correctly.

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Cooling fans dont engage! 1998 oldsmobile silhouette!


Your Problem Can VERY WELL BE with the Temp Sensor, As It Is the First in This Electrucal Circut . it Waits for 210-230 Degree Engine temp and Gives that Sygnal to the ECM then ECM Grounds out the Cooling FAN RELAY To Turn ON the FANS and the Temp Sensor is Usualy THE #1 Culpret Closley in front of the RELAY.
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