Pelican Parts Forums - E90 Fan running at full speed after thermostat replacement

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- BMW 3-Series E90 (2006-2012) (http://forums.pelicanparts.com/bmw-3-series-e90-2006-2012/)

- - E90 Fan running at full speed after thermostat replacement (http://forums.pelicanparts.com/bmw-3-series-e90-2006-2012/945265-e90-fan-running-full-speed-after-thermostat-replacement.html)

I drive 07 328i. A week ago, I have replaced thermostat and water pump and everything was okay. A day after, I started the engine and drove the car and felt car did not have enough power even though I hit about 1/2 or 3/4 of gas. Also, When I change the gearManual car and hit the gas, there is delay of car reactionwas reacted right away. I stopped the car and heard radiator fan was spinning crazy. I put the car back on drive way and turned off the engine and turned it on again. I heard radiator fan still spins crazy. Could it be temperature sensor located in cylinder head or lower radiator?

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This post was auto-generated based upon a question asked on our tech article page here: BMW E90 Engine Temperature Sensor Replacement | E91, E92, E93 | Pelican Parts DIY Maintenance Article

Usually the fan running like crazy can be a bad water pump or thermostat, could also be a communication problem between the engine control unit and the water pump. Also make sure that you have performed the bleeding procedure for the cooling system. Restore communication first and then check faults.

- Casey