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07-24-2015, 11:53 PM
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#1 |
 Join Date: Jul 2015
Posts: 23
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Fan won't go on
I have a SYM HD200
It is water cooled. There is a fan in front of the radiator, it is turned on by a thermal sensor that is screwed into the radiator. So the fan does not come on when the scoot gets hot. It should enable at about 210 degrees F I pulled the two wires, and jumping them together turns the fan on. I replaced the sensor with a known good sensor. No joy, fan does not come on. So the only thing I can figure out is the fluid in the radiator is not hot enough because: Air in system (was professionally flushed last month at a dealer) Thermostat not opening Water pump not working. Anything else anyone can think of? I will test the thermo tomorrow by taking off the cap and cranking it up. You can see when the thermo opens. Any other ideas? |
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07-25-2015, 12:31 PM
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#2 |
 
Join Date: Oct 2008
Location: Hyde Park, NY
Posts: 1,192
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Is there a relay that the sensor sends a signal to? You might want to check the good sensor for continuity in hot water somehow too. Maybe attach test leads to the sensor.
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2008 Eagle Milano 150- 9,679 miles 2009 Honda Rebel 250- 10,434 miles 2009 CF Moto Fashion- 16,023 miles 2009 MC-114 50cc Cub Clone- 4,317 miles twowheeler.yolasite.com/ That's 30,049 China Scootin miles and Counting. |
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07-25-2015, 09:22 PM
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#3 |
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Join Date: Jul 2015
Posts: 23
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Fixed. Both switches were bad. Installed one of these, fan pops on a 190F and keep the engine nice and cool:
http://www.ebay.com/itm/261235617604 |
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Linear Mode
