Cooling fans not coming on

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highlander · #16 Post by **highlander** » Sun Jun 12, 2016 8:41 pm

A bit old school but you can pop the thermo in a pan of water and boil it while having a multimeter attached and a sweetie thermometer to one side - shows at what temperature the switch really closes.

If it doesn't go by 105 C then turn off the hob ... and replace thermo

#17 Post by **mangocrazy** » Sun Jun 12, 2016 9:32 pm

But surely a failed stat would show itself as coolant not getting to temperature (failed open) or temperature rocketing up (failed shut). Either way whether the fans come on after a certain coolant temp has been reached is a different issue, isn't it?

Temperature climbed steadily, as I'd expect, but fans failed to come on when coolant temp was already 102-103 deg C. Normally fans kick in around 95-96 deg C on my bike.

fatboy · #18 Post by **fatboy** » Mon Jun 13, 2016 5:50 pm

If your rads were warm to touch then its not a stat issue and re read the previous page !
Hopefully you will be able to find the culprit quicktime.

#19 Post by **mangocrazy** » Mon Jun 13, 2016 9:05 pm

Will be having another look on Thursday. Should know more then...

#20 Post by **mangocrazy** » Thu Jun 16, 2016 10:17 am

Just a quickie - when I checked, one of the connections to the switch had been pulled loose. Reseated it and normal service was resumed.

Which just goes to show, always check the simple stuff first...

fatboy · #21 Post by **fatboy** » Thu Jun 16, 2016 6:25 pm

mangocrazy wrote:Just a quickie - when I checked, one of the connections to the switch had been pulled loose. Reseated it and normal service was resumed.

Which just goes to show, always check the simple stuff first...

Thats how I always try and approach problems, thankfully it worked for you