While there are a variety of reasons your bmw 335i is overheating the most common 3 are a coolant leak water pump radiator hose etc the radiator fan or a failed thermostat.
Bmw 335i radiator fan not working.
The fan has a final stage resistor built in so it gets a pwm signal for activation and speed.
Check power and ground at the fan connector.
Electric water pump diagnosis buy your parts here.
Diy bmw radiator fan stuck on high.
41 of the time it s coolant leak water pump radiator hose etc.
Http go magik ly ml 7uko here i will explain the diag proces.
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Cooling fan problem solved bmw e36 318i.
From below check fan shroud clearance at radiator if needed gently lever fan away from radiator then slide down and lock into place.