yamahajrb Posted August 27, 2012 Share Posted August 27, 2012 Hi, can someone tell me if the ignition needs to be ON for the fan to kick in or should it still kick in when the ignition is in the OFF position, ie: should the fan continue to cool the bike even when you've taken the key out until normal temp is reached, thanks, john Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 Sorry, the bike is a 2001 yamaha fzs fazer 600. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 27, 2012 Moderator Share Posted August 27, 2012 although i dont 'know' the answer i would suspect that the fan will continue to cool the engine even after the key is off Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted August 27, 2012 Moderator Share Posted August 27, 2012 +1 Not bike specific but most run on a timer even with the key out. Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 Yes I think you're both right, I suspect both fan switch & temperature switchs are faulty (not switching in boiling water), fan only works with ignition on so I'm going to isolate ignition live to the fan switch & connect a permanant fused live to the switch instead & replace both switchs of course, please let me know what you think of the above, (they should operate in boiling water should'nt they?), thanks, John Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 I think I'd better give you the whole story, after a ride out yesterday I found a lot of dirty white stuff around each of the exhaust outlets where the downpipes fit, I can only think its either gasket or more likely gasket seal as I believe the gaskets are copper but not sure, I could only think that the bike must have overheated to cause this, I left the bike running in the garage for nearly an hour this morning & neither the fan or the temp warning light came on so I assume both switches are faulty, I've since found out that the temperature that both switches operate is 102c-108c so boiling water would not have operated them anyway, apparently because the cooling system is pressurised that raises the boiling point of coolant, the white stuff is like chalky & has formed a ring around the exhaust outlets, I can break it off in chunks, the bike starts & runs ok, any ideas guys, thanks John Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted August 27, 2012 Moderator Share Posted August 27, 2012 Are you losing any water from the system? If you look at the oil, is there a white "mayo" type of slime floating on it? Link to comment Share on other sites More sharing options...
dt502001 Posted August 27, 2012 Share Posted August 27, 2012 Not nessarly ..water boils at 130f and the cooling system operates at `180f the switch probably wont close untill 185f or higher to turn the fan on some dont come on untill 210. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 27, 2012 Moderator Share Posted August 27, 2012 yep i can see where DirtyDT is coming from...possible head gasket failure. is your coolant level dropping? any sign of water / or steam coming from the exhaust? Link to comment Share on other sites More sharing options...
dt502001 Posted August 27, 2012 Share Posted August 27, 2012 A hour is more than long enought to trip the fan on ..probably what is happening is air is traped arund the switches not alowing them to be heated by coolant. is the thermostat opening? If the white chunky stuff is coolant you have to be loosing coolant from the system. You can put some head gasket in a bottle to temporaly fix it. Link to comment Share on other sites More sharing options...
dt502001 Posted August 27, 2012 Share Posted August 27, 2012 If it leasking out there won't be coolant in the oil most likely Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 Thanks for replys, no loss of coolant at all, no boiling over, no water or steam from exhaust, the Haynes manual says that both switches operate at between 102C & 108C, not sure if the thermastat is opening or not, not tested yet, cheers, John Link to comment Share on other sites More sharing options...
dt502001 Posted August 27, 2012 Share Posted August 27, 2012 A hour is more than long enought to trip the fan on ..probably what is happening is air is traped arund the switches not alowing them to be heated by coolant. is the thermostat opening? If the white chunky stuff is coolant you have to be loosing coolant from the system. You can put some head gasket in a bottle to temporaly fix it. K seal form Solv-tec works very well www.solv-tec.com don't bother if the coolant is mixed in the oil but if its only blowing out it will seal it in about 20min run time Link to comment Share on other sites More sharing options...
dt502001 Posted August 27, 2012 Share Posted August 27, 2012 Thanks for replys, no loss of coolant at all, no boiling over, no water or steam from exhaust, the Haynes manual says that both switches operate at between 102C & 108C, not sure if the thermastat is opening or not, not tested yet, cheers, John The thermostat must be opening if not then it would boil over or run cold if stuck open and the fan wouldn't need to come on check the eng temp with a temp gun. The white chunky stuff does it keep comming back? or did you just ride through some stuff on the road Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 The white stuff has not reappeared while I ran it in the garage this morning, do you think checking the thermostat is a good idea, also immediatly before this ride out I changed the coolant 50/50 mix, I should add I have never heard the fan run in the 9 months I've had the bike, I've bypassed both switches & both the fan & the warning light are working ok, cheers John Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 I've just tested the thermostat, book says: opens @ 80.5c - 83.5c, 8mm min @ 95c, just short of boiling it only opens 1mm-2mm, boiling water & it opens 8mm-10mm, cheers, John Link to comment Share on other sites More sharing options...
yamahajrb Posted August 27, 2012 Author Share Posted August 27, 2012 I've just dropped the oil & theres no sign of water in the oil, no sign of oil in the coolant either so I hope the head gasket is ok (everything crossed), will fit new switches & new thermostat & hope that cures it, I'll let you guys know what happens & thanks to you all for your help, cheers, John Link to comment Share on other sites More sharing options...
dt502001 Posted August 28, 2012 Share Posted August 28, 2012 New never hurts but might not be nessary. Spend a fewbucks on a none contact temp gun and check the temps all is prob ok and your woring about nothing John you may never hear the fan run in the climate you live in ..it`s more of a back up for high temps that you guys realy never see. here it`s been 30 c for weeks not a barely drop of rain for a month nights 25c we need fans just to keep the bike from over heating in traffic but they go off soon after you get roling. anyway let everyone know how you make out Link to comment Share on other sites More sharing options...
yamahajrb Posted August 31, 2012 Author Share Posted August 31, 2012 UPDATE: Right, fitted new fan sensor switch, fitted new temperature warning light sensor switch & for good measure, fitted new thermastat, everything is now working as it should , changed oil & filter while I was in the mood to spend money, talking of money, these bike manufacturers should be bloody ashamed of themselves, the way they are ripping their customers off, get this lot: fan switch £45.00, warning light switch £65.00, thermastat £33.00, then oil & filter on top, another £35.00, makes me really f--king angry , but what can we do, they've got us by the buster browns aint they , thanks for all your help & advise & ride safe guys Link to comment Share on other sites More sharing options...
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