curtis Posted March 25, 2015 Share Posted March 25, 2015 When I shut down the bike, and temp reads 224f, should the fan be running? Not sure if fan is supposed to run with motor off (ignition on)or not, my FJR does. Thanks. Link to comment Share on other sites More sharing options...
Member Contributer KevCarver Posted March 25, 2015 Member Contributer Share Posted March 25, 2015 Fan doesn't run with key off. At that temp, it should have been on. Was it before you shut it off? Link to comment Share on other sites More sharing options...
curtis Posted March 26, 2015 Author Share Posted March 26, 2015 Key was on, Motor off. Temp reading 224. Im not sure if it fan was running before i shut bike off or not. Link to comment Share on other sites More sharing options...
Member Contributer MadScientist Posted March 26, 2015 Member Contributer Share Posted March 26, 2015 The fan should run with key on above 220 (I think) whether the engine is running or not. Link to comment Share on other sites More sharing options...
curtis Posted March 26, 2015 Author Share Posted March 26, 2015 Is it a known issue, fan not running? Link to comment Share on other sites More sharing options...
Member Contributer MadScientist Posted March 26, 2015 Member Contributer Share Posted March 26, 2015 Not commonly, AFAIK. Luckily there are only 4 possible culprits. In order of things I would check: 1. The fan fuse 2. The ignition switch (This also checks all wiring supplying +12v to fan) - With the switch in the ON position (engine can be off) disconnect the fan connector and measure voltage between the Black/Blue wire and chassis ground - Reading should be 12V or more, depending if the engine is running 3. The fan ground switch - senses coolant temperature and provides ground to fan above the temperature threshold - To check this, get bike up to fan switch temperature 220 (someone correct me if this is the wrong temp) - Measure resistance between fan switch wire connection terminal (there is only one) and vehicle chassis - Reading should be low, certainly below 1k ohms. If the switch is bad, it will probably read open (or OL or inf) depending what kind of meter is being used 4. Wiring and grounds - Hopefully we don't have to go this far - Report back if it is not #1-3 If you start test 3 with everything hooked up and the fan turns on, then the previous issue was a 1 time fluke or an intermittent fault which will be considerably more difficult to diagnose. Link to comment Share on other sites More sharing options...
Member Contributer KevCarver Posted March 26, 2015 Member Contributer Share Posted March 26, 2015 Be sure to check that the fan can spin freely. Is this a new bike to you? Some have installed a dedicated switch to run the fan whenever they choose. Perhaps a previous owner has done this? Link to comment Share on other sites More sharing options...
curtis Posted March 26, 2015 Author Share Posted March 26, 2015 Thanks guys. I appreciate all the info. I cannot hear the fan with engine running. But good news, this morning I fired her up and let idle half choked until up to temp. When temp reached 218f it started dropping quickly back down to 205ish. I killed the motor and the fan WAS running. Still not 100% sure why it wasnt running at 224f yesterday after my ride. I may have turned off the key then back on, dont remember for sure and dont know,if that would make difference. Anyway I will keep an eye on it. I do like the idea of a manual fan switch. Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted March 26, 2015 Member Contributer Share Posted March 26, 2015 I recall that the fan would come on with the ignition off after a spirited ride in summer. I ride a 4th gen. Link to comment Share on other sites More sharing options...
Member Contributer DFerrell Posted March 27, 2015 Member Contributer Share Posted March 27, 2015 With the fairings off could you short across the temp switch and see if the fan comes on? With key on of course. Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted March 27, 2015 Member Contributer Share Posted March 27, 2015 I do like the idea of a manual fan switch. I'm very happy with mine - lets me manage the temps much better in traffic. Link to comment Share on other sites More sharing options...
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