most likely. if it sounds like the garbage truck it is. The titan Has an electro-viscous fan, I suspect they have a lot of bad electronic module and they end up engaging randomly. mine broke not long after the engine replacement… figure they damaged it doing the job… but then again they might just be el cheapo cluch fans.last night, the fan engaged with or without the AC on...it seems to be random, but much more likely to lock up if the ac is on. it's gotta be a fan clutch right?