Bike Overheated-Fan not turning on - Yamaha Raptor Forum
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post #1 of 30 (permalink) Old 08-28-2013, 10:19 PM Thread Starter
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Bike Overheated-Fan not turning on

Riding this weekend, bike turned off and would not start back up because it was overheated, noticed the fan wasn't turning on. So I took it home and connected the fan straight to the battery and it works. What's the next thing I should look for?
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post #2 of 30 (permalink) Old 08-28-2013, 10:56 PM
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Put your fan on a toggle switch with an inline fuse. I did that and just turn it on when I start my bike so I know it's on
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post #3 of 30 (permalink) Old 08-28-2013, 11:04 PM
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You don't need the fan, normally, while the quad is moving... if you overheated while riding you have other issues like thermostat or water pump, for example.

Fix the fan but start looking for the REAL issue.

Unplug the connector at bottom of radiator - it is plugged into the fan thermo-switch. Short across the two sockets in the unplugged connector - does the fan come on now?

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post #4 of 30 (permalink) Old 08-29-2013, 05:36 AM
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my guess is that it ddnt start because of something else. i dont even have a fan in mine, and i run it hard lol...
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post #5 of 30 (permalink) Old 08-29-2013, 06:17 AM
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Originally Posted by Stangman2305 View Post
Put your fan on a toggle switch with an inline fuse. I did that and just turn it on when I start my bike so I know it's on
All that does is over cool the motor wich can cause problems too. Yamaha designed the raptor to run with in a given temperatures range. The clearances between moving engine parts are affected by temp.

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post #6 of 30 (permalink) Old 08-29-2013, 11:33 AM
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Originally Posted by raptorider979 View Post
Riding this weekend, bike turned off and would not start back up because it was overheated, noticed the fan wasn't turning on. So I took it home and connected the fan straight to the battery and it works. What's the next thing I should look for?
Check for a leaking head gasket also. When the head gasket leaks it causes problems inside the cooling system and affects the sensors that control the fans and warning lights.


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post #7 of 30 (permalink) Old 08-29-2013, 01:11 PM
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Wow I didn't realize I could be hurting my bike by doing that. I will look into wiring it back to the stock sensor. Thanks for the info
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post #8 of 30 (permalink) Old 08-29-2013, 01:37 PM
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Wow I didn't realize I could be hurting my bike by doing that. I will look into wiring it back to the stock sensor. Thanks for the info
It's not that bad. The engine is thermostat protected.


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post #9 of 30 (permalink) Old 08-29-2013, 09:33 PM Thread Starter
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Originally Posted by QuadManiac View Post
You don't need the fan, normally, while the quad is moving... if you overheated while riding you have other issues like thermostat or water pump, for example.

Fix the fan but start looking for the REAL issue.

Unplug the connector at bottom of radiator - it is plugged into the fan thermo-switch. Short across the two sockets in the unplugged connector - does the fan come on now?
ok im going to try it out on sat when im off. thanks for the info and in the case the fan comes on or dosen't what's next to look for?
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post #10 of 30 (permalink) Old 08-30-2013, 06:04 AM
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ok im going to try it out on sat when im off. thanks for the info and in the case the fan comes on or dosen't what's next to look for?
As I said, head gasket leaking, check for lots of bubbles in the coolant........


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