Cooling fans not coming on - Yamaha Forum : Your Yamaha Motor Products Community & Resource
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post #1 of 7 (permalink) Old 06-18-2010, 03:16 AM Thread Starter
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Cooling fans not coming on

My radiator fans are not coming on. Anyone have an idea why?

Was thinking to was the temp sensor in Radiator. But not sure. And not sure how to test.

If it matters I am running a streetfighter front with an aftermarket digital gauge by acumen
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post #2 of 7 (permalink) Old 07-09-2010, 07:55 PM Thread Starter
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I jumped the connector that goes to the fan switch the very top sensor on rad....I think. it has a blue and red/white wire. When I did this the fans came on. Does that mean that the sensor is bad? (what I think...but not sure)

And does the temp gauge need to be connected for the fans to come on?
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post #3 of 7 (permalink) Old 07-09-2010, 08:31 PM
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pull the sensor, boil some water, hold the sensor in the water somehow safe, so you don't get burned, when the water reaches 160 degrees, i think, It should go from opened to closed. use a multimeter, and check for the amount of resistance, look in a manual to find the allowable specs.
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post #4 of 7 (permalink) Old 07-11-2010, 07:33 PM
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paper clipsor bailing wire to hold the sensor
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post #5 of 7 (permalink) Old 07-12-2010, 09:11 PM Thread Starter
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Quote:
Originally Posted by itsmygame View Post
paper clipsor bailing wire to hold the sensor
Huh? Sorry don't understand what you mean by that.
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post #6 of 7 (permalink) Old 07-13-2010, 11:34 AM
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If the fans do not come on by 100 degrees C. most likely the fan control switch (sensor) is shot. Just replaced mine and the fans do come on now before 100 C.

You could also add a manual switch on the gauge pod somewhere to control it manually. Just install a jumper wire with a switch and control it yourself. It is a difference between a $40 control and a $5 manual switch.
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post #7 of 7 (permalink) Old 07-15-2010, 10:45 PM
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Bailing wire wrapped w/ sensor then put in boiling water to test. Do not touch!
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