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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Radiator Fan functions



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      07-04-2012, 08:26 PM   #1
sn0pea
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Radiator Fan functions

Hey everybody,
So about a month ago my car was producing the symptoms of a faulty water pump/thermostat. Well recently, I just found time to fix it (I've been gone on vacation).
I just turned the car on for the first time in a month today and I'm running into something unusual.
Pretty quickly after I turn the car on, the radiator fan kicks in. I thought this fan only went on when the water pump was dying.
So I am not really sure, how does the radiator fan operate?
It did sound as loud as it did when my water pump failed, but it is definitely spinning.
Possible hint: I live in Oklahoma, where it is 103 degrees currently
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      07-04-2012, 09:05 PM   #2
AllBlackBimmer
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any error codes?

My radiadtor fan kicks on after normal driving for seemingly no reasons sometimes. sounds like a rocket ship is about to take off, I know bmw's run hot but holy hell. on the same note, the heat coming from the underneath the rear of the car is almost unbearable haha.

I wonder if my water pump is on its way out, I have an 08 with 60k, but 42k of that was spent in sunny sunny florida... AND of course my car is black, which doesnt help with the heat.

I am taking my car to the dealer in about a month and I plan on whining for a new water pump... any tips on this? my car is covered under CPO still.
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      07-04-2012, 09:52 PM   #3
Brian_TII
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If the ac is on it probably is turning the fan on for the ac condenser.
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      07-04-2012, 10:07 PM   #4
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Quote:
Originally Posted by AllBlackBimmer
any error codes?

My radiadtor fan kicks on after normal driving for seemingly no reasons sometimes. sounds like a rocket ship is about to take off, I know bmw's run hot but holy hell. on the same note, the heat coming from the underneath the rear of the car is almost unbearable haha.

I wonder if my water pump is on its way out, I have an 08 with 60k, but 42k of that was spent in sunny sunny florida... AND of course my car is black, which doesnt help with the heat.

I am taking my car to the dealer in about a month and I plan on whining for a new water pump... any tips on this? my car is covered under CPO still.
No error codes displayed on the dash. I don't have a BT cable to check hidden codes.
Maybe it was to power the AC.
Like I said, it didn't make rocket ship volume sounds, but it was running at a lower speed.
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      07-05-2012, 10:31 AM   #5
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If you have the AC on, the fan is loud especially in the hot summer. I thought mine has a problem until I walked pass an idling 328i (brand new coupe) and the fan is as loud as mine. I would say normal.
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