Coolant Fan running all the Time By kczukiman (Read 893 times)

[kczukiman]

Another issue with wife's new YY250T. When I turn the key to the on position I hear the coolant fan turn on. Motor is cold temp in the garage is about 65.
Any idea's what would cause this ?

Thanks, Dave

[justbuggin2]

either the fan is wired to come on through a relay when the key is on or the temp switch is shorted causeing the fan to come on

[kczukiman]

[replyingto=justbuggin2]justbuggin2[/replyingto]It didn't do it at first. Its been only started about five times as it is a new scoot. I'll check out the switch. Thank you for the reply.

[JR]

Sorry I didn't see this sooner kczukiman. The fan is cotrolled by what is called a thermoswitch on the radiator. This switch closes when the temp of the coolant reaches around 165F and turns the fan on.

There is only two possibilities if it immediately comes on with just turning the key on.

The switch is stuck in the closed position...or
The wires in the harness which would be the hot lead from the fuse box and the hot lead to the fan have rubbed or fused together.

Betting it's the switch. Got to pull some of the plastics, locate the switch on the radiator and get the meter out and do a ohm test on it. If you pull the wires off of the switch, turn the key on and it still runs, time to start tracing wires.

JR

[kczukiman]

[replyingto=admin]JR[/replyingto]Thank you JR. good info. It looks like it will be Sunday before I get a chance to dive into it. I will post my results.
Lol great, new plastic, bye bye tabs.

[kczukiman]

[replyingto=kczukiman]kczukiman[/replyingto]JR,
You was right on the money. I pulled the two wire connectors off of the switch and crimped the contacts the reattached them. Then separated them as much as I could. Turned the key and no fan running.
Thanks for the help,my wife is now a happy camper !

[alleyoop]

FANTASTIC!! Easy fix those are the best.
Alleyoop

[kczukiman]

[replyingto=alleyoop]alleyoop[/replyingto]Well pooo. Its doing it again. New switch is shipping tomorrow.
Well at least I know how to get the plastic off.

[JR]

Yep it's sticking closed on you. Now the good old burp comes into play.

JR

[kczukiman]

Apr 22, 2013 5:57:38 GMT -6 JR said:

Yep it's sticking closed on you. Now the good old burp comes into play.

JR

So air in the system will cause the switch to stick close ? Or are you meaning when I drain the system to change the switch.

[yoster]

On the subject of cooling, if you're planning to change the coolant during this process, I highly recommend you go to a 20/80 or 30/70 mix (antifreeze/water) and a portion of either hyperlube, water wetter, or other similar product. This is if you don't live in freezing climate.

I'll tell ya ever since I've done that, my scooter has ran much, much cooler. At first the difference wasn't huge but as I put more miles on it with that setup it got better (assuming due to the Hyperlube mixing in.) The hyperlube also contains all lubrication properties needed for your water pump and whatnot - you can technically run that with straight water and be fine in both the lube and anti-corrosion departments. Of course the larger portion of water helps a good deal as well. My area doesn't ever freeze so I can benefit from running much lower antifreeze ratios.

Anyway, I know your thread is about the switch, but figured I'd mention that since it's somewhat related.

[kczukiman]

[replyingto=yoster]yoster[/replyingto]Thanks for the info yoster. it does freeze in my area but scooter is never exposed to it.