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Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 3040
Experience:  10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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I have an 2004 330ci with an over heat issue. while driving

Customer Question

i have an 2004 330ci with an over heat issue. while driving and five minutes after the temperature needle reaches 12 oclock I notice the it slowly overheats. I open the hood and also notice the fan is running slow. now I have replaced the fan, thermostat, coolant sensor, and expansion tank. I am still having the same problem. please help
Submitted: 12 months ago.
Category: BMW
Expert:  Steve replied 12 months ago.
Hello and welcome,
My name is ***** ***** it will be my pleasure to assist you today.
What kind of help are you seeking with this? Did you want to know possible causes?
Customer: replied 12 months ago.
At first I thought it was the fan so u purchased a new one but still having the same issue. The fan slows after a few minutes of driving.
Customer: replied 12 months ago.
I don't know the cause but I would appreciate any help I can get
Expert:  Steve replied 12 months ago.
The fan initially runs fast then slows down?
Customer: replied 12 months ago.
I noticed while it's running fast my air condition is blowing cold but when the fan slows down my car overheats and I lose cold air
Expert:  Steve replied 12 months ago.
Which coolant sensor did you replace?
Customer: replied 12 months ago.
Lower hose sensor
Customer: replied 12 months ago.
I also replaced the small black box located above the fan but then was told it had nothing to do with the radiator fan
Customer: replied 12 months ago.
Is this something common?
Customer: replied 12 months ago.
Customer: replied 12 months ago.
Steve are you there
Customer: replied 12 months ago.
Customer: replied 12 months ago.
Never received an answer