JimMoore Posted March 27 Share Posted March 27 Hi Guys, The temperature got into the mid-230s today and the fan didn't come on. I just got home so I haven't been able to look at it, but I've been able to ascertain the fan blades spin freely, so hopefully it's not the fan itself. I figure it's wither the switch or the fan. Any tricks to troubleshooting this thing? Thanks, Link to comment Share on other sites More sharing options...
JimMoore Posted March 27 Author Share Posted March 27 The fuse is OK. Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted March 27 Member Contributer Share Posted March 27 Check that the coolant is full. If it's low and does not cover the switch, it can not correctly sense the temp. When adding coolant, bleed the system with the bike on the sidestand to make the cap the highest point in the system. While you're at it, check the condition of the cap, replace if necessary. If coolant is full, pull the wire from the fan switch, ignition switch on. Check for battery voltage at the wire. If volts are good, ground the wire. The fan should operate. If all that checks out the switch may have failed. Let us know what you find. Link to comment Share on other sites More sharing options...
squirrelman Posted March 27 Share Posted March 27 a lot of riders install a switch in parallel with the radiator temp switch to better control water temp in traffic. old thermo switches often fail. Link to comment Share on other sites More sharing options...
JimMoore Posted March 27 Author Share Posted March 27 Thanks guys. it's cocktail hour here, so I'll be looking at it in the morning. Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted March 27 Member Contributer Share Posted March 27 there's multiple points of failure. You'll want to do some testing to see where fault is: 1. apply power & ground directly to fan and verify it spins 2. test thermoswitch in pot of water being brought to boil and measure temperature when it closes 3. test wiring between switch and fan. Idle bike until reaches fan-switch temp and measure voltage at fan connector. Does it have power when fan-switch closes? Link to comment Share on other sites More sharing options...
squirrelman Posted March 28 Share Posted March 28 2 hours ago, DannoXYZ said: . Idle bike until reaches fan-switch temp and measure voltage at fan connector. just me........ but i don't like letting my bike sit and idle for that long. i've gone through many cases of non-running fans, once a bad ground and ALL the other times a bad switch. Link to comment Share on other sites More sharing options...
JimMoore Posted March 28 Author Share Posted March 28 Low coolant, sure as shit. The fan worked fine. The reservoir was empty and the coolant was pretty low in the radiators. I filled it up, topped off the reservoir and went for a ride. Worked like a champ. Thanks for the help, fellas. I'm kinda wondering where all my coolant went though. I haven't checked it in awhile. I'm wondering if the stain in the reservoir tricked me into thinking I had coolant when I didn't. I'll keep a closer eye on it from now on. Link to comment Share on other sites More sharing options...
Magneto Posted March 28 Share Posted March 28 It’s not over until you find the leak... 😉 Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted March 29 Member Contributer Share Posted March 29 If a leak isn't obvious, it could be under the throttle body. 5th gens and VTEC's have a habit of fossilizing the o-rings on the water necks coming out of the heads. And, the hoses are now 20+ years old . . . If you do get in there to change anything out, be sure to put in a new thermostat while you're at it. Link to comment Share on other sites More sharing options...
Magneto Posted March 29 Share Posted March 29 Riding in hot climate I have hard time to fathom keeping 20 year old rubber on a vehicle - getting stuck on a side of the road ain't fun. V motors are bit of pain with those well hidden hoses you mentioned. My SV being 2006 and virtual not ridden still had ugly hoses sitting under throttles... Link to comment Share on other sites More sharing options...
JimMoore Posted March 29 Author Share Posted March 29 You guys are sapping my will to live with this talk of leaks. Oh well. I'm planning to do a major service in a few thousand miles. I'll take a serious look around then. Link to comment Share on other sites More sharing options...
Magneto Posted March 29 Share Posted March 29 You are welcome Jim 🙂 New and old.. Link to comment Share on other sites More sharing options...
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