Exhaust Fan not turning on.

Could someone please tell me how to turn on my exhaust fan?? My MB is running at about constant 55℃, which is normal, but I ran the yes>/dev/null and it was up over 110℃ with CPU idle% usage of 47% and still no fan turned on. It used to come on all the time while I was watching videos etc and now - nothing. I've recently had the logic board replaced - coincidence?
smcFanControl is installed - no effect.
FanControl 2.1 is installed - no effect.
iStat is installed for monitoring - exhaust fan reads 0rpm.
Help!!
Thanks.

I would take it in to Apple.

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recently my mac's been overheating, catastrophically, it causes crashes, freezes etc. during high processing situations.
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but the one on the right is always 0rpm, and i cant hear this fan spin either, so i trust iStat's result.
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Exhaust Fan not turning on.

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