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2005 BMW 325i Fan

Tiny
DUEX187
  • MEMBER
  • 2005 BMW 325I
  • 6 CYL
  • AUTOMATIC
  • 200,000 MILES
When I start my car in park after 10 to 15 minutes the fan goes on and then starts getting faster and faster sounds like a aeroplane also if I start the car and turn the heater on it the fan starts straight away and gets faster and faster
Wednesday, February 18th, 2015 AT 1:58 AM

9 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That is probably by design because it is likely wired to run the AC compressor when defrost or even heat are requested and the fans are required when the compressor is running.
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Wednesday, February 18th, 2015 AT 5:51 AM
Tiny
DUEX187
  • MEMBER
  • 5 POSTS
No even if I don't turn the heater on it the fan starts to accelerate and sounds very loud but doesn't shut off until I turn the car off
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Wednesday, February 18th, 2015 AT 11:30 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Somebody is going to have to use a scan tool to analyze the sensor data to determine if it's a temp sensor of something triggering that.
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Wednesday, February 18th, 2015 AT 3:21 PM
Tiny
DUEX187
  • MEMBER
  • 5 POSTS
I have nothing came up I changed the temp sensor and thermo is there any way to test the electric water pump is working
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Wednesday, February 18th, 2015 AT 3:35 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Do you have a fan problem or an overheating problem? Which is it?
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Wednesday, February 18th, 2015 AT 3:37 PM
Tiny
DUEX187
  • MEMBER
  • 5 POSTS
It started with a overheating light coming on and the fan was on super fast I changed the temp sensor and thermo now after the car is warm the fan starts and goes faster and faster but no overheating light comes on I just don't no what it could be it's driving me nuts
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Wednesday, February 18th, 2015 AT 6:09 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The first step is to pressure test the cooling system for leaks. You likely have lost coolant and have air pockets now.
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Wednesday, February 18th, 2015 AT 6:12 PM
Tiny
DUEX187
  • MEMBER
  • 5 POSTS
It's not losing coolant do you think it's the water pump
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Wednesday, February 18th, 2015 AT 8:45 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The only thing I THINK is that it should be tested thoroughly to determine what is going on. You aren't going to find a magic answer online. The car needs to be troubleshooted "on site" by someone that understands the system.
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Thursday, February 19th, 2015 AT 2:08 AM

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