Fan running at full speed after driving

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

[Casey at Pelican Parts]

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.

- Casey