Radiator Fan functions

sn0pea · 07-04-2012, 09:26 PM

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

BlackedOutBimmer · 07-04-2012, 10:05 PM

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.

Brian_TII · 07-04-2012, 10:52 PM

If the ac is on it probably is turning the fan on for the ac condenser.

sn0pea · 07-04-2012, 11:07 PM

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.

csupernova · 07-05-2012, 11:31 AM

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.

07-04-2012, 09:26 PM	#1
sn0pea Captain 50 Rep 842 Posts Drives: Black 325i 2006 Join Date: Oct 2010 Location: OK iTrader: (1)	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 __________________ 2006 325i: Matte Black Grills, AG m310 19's (19X8.5et35 & 19X9.5et33 - 235/35/19 & 265/30/19), Amber Covers, Magnaflow with black tips, Blacked Emblems, M3 Replica Bumper and Vorsteiner hood!
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07-04-2012, 10:05 PM	#2
BlackedOutBimmer Colonel 846 Rep 2,828 Posts Drives: 2019 X3 m40i Join Date: Aug 2011 Location: USA iTrader: (-1)	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. __________________ 2019 X3 m40i:Carbon Black:Executive:Premium:Adaptive:Vernasca:699M:HK: Ambient:IND trim:M Mirrors:15mm spacers:Maxton lip:20% tint windows/pano:dsg paddles:TLG mudflaps 2008 328i E90 Jet Black:6MT:RWD:Premium:Sport:Xenon:MTEC V3 AEs:Front Splitters:CF spoiler:19" VMR FF v710
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07-04-2012, 10:52 PM	#3
Brian_TII Second Lieutenant 8 Rep 229 Posts Drives: 06 e90 330i 6spd Join Date: Aug 2010 Location: Atlanta, GA iTrader: (0)	If the ac is on it probably is turning the fan on for the ac condenser.
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07-05-2012, 11:31 AM	#5
csupernova Captain 33 Rep 606 Posts Drives: E90 330i Join Date: Sep 2007 Location: NYC iTrader: (7)	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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