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      07-21-2009, 12:28 AM   #1
UnknownSpiritX5
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Engine heating on my '07 328i / very loud fan?

I'm not sure if this is normal, but last night while I was parking, my 328i became very loud. At first I wasn't sure what it was, so I quickly turned the engine off and stepped outside to look. It seemed like the noise was coming from my fan compartment (I've never heard it be this loud). I started the engine again, and stepped outside and it was definitely coming from my fan.

I assumed the fan was moving much faster than other times probably because the engine heated up, but when I touched under the hood towards where the engine is located, it was weirdly cool and not as hot as I had suspected. INFACT, it was when I touched near my fan in the front, it was much hotter than the other surfaces on my hood, plus it was extremely loud.

So has this happened to anyone else before? Should I be worried about some part(s) not functioning as they should be? Could this be due to driving in sport mode (I accelerated and decelerrated perhaps way too much causing stress on the engine?) But I assume this car was built to handle that?

Also, my AC wasn't on, if that has to do with anything.

Any suggestions would be helpful! Thanks!
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      07-21-2009, 12:30 AM   #2
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Quote:
Originally Posted by UnknownSpiritX5 View Post
I'm not sure if this is normal, but last night while I was parking, my 328i became very loud. At first I wasn't sure what it was, so I quickly turned the engine off and stepped outside to look. It seemed like the noise was coming from my fan compartment (I've never heard it be this loud). I started the engine again, and stepped outside and it was definitely coming from my fan.

I assumed the fan was moving much faster than other times probably because the engine heated up, but when I touched under the hood towards where the engine is located, it was weirdly cool and not as hot as I had suspected. INFACT, it was when I touched near my fan in the front, it was much hotter than the other surfaces on my hood, plus it was extremely loud.

So has this happened to anyone else before? Should I be worried about some part(s) not functioning as they should be? Could this be due to driving in sport mode (I accelerated and decelerrated perhaps way too much causing stress on the engine?) But I assume this car was built to handle that?

Also, my AC wasn't on, if that has to do with anything.

Any suggestions would be helpful! Thanks!
Cars just cooling down, its completely normal
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      07-21-2009, 12:30 AM   #3
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Mine is loud at times. I believe they are a variable speed and run according to the temps. I only hear mine like that lately when its been ninety outside and I'm using the AC.
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      07-21-2009, 02:17 AM   #4
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Quote:
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Mine is loud at times. I believe they are a variable speed and run according to the temps. I only hear mine like that lately when its been ninety outside and I'm using the AC.
Phew, so I have nothing to worry about. Thanks!
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      07-21-2009, 10:27 AM   #5
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Phew, so I have nothing to worry about. Thanks!
Exactly.. most likely you had your A/C on. If you turn it off you will notice a drastic drop in the fan noise you heard. Turn it back on and it will sound crazy loud again.
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      07-21-2009, 01:49 PM   #6
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Exactly.. most likely you had your A/C on. If you turn it off you will notice a drastic drop in the fan noise you heard. Turn it back on and it will sound crazy loud again.
+1

No problem, nothing to worry about. Completely normal for any car.
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      07-21-2009, 04:20 PM   #7
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These cars are able to withstand a lot of stress so if the fan is running a little harder I would not worry about it unless it sounds like it's going to fall off.
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      07-22-2009, 02:22 AM   #8
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It's normal for very hot weather seasons. Mine does that a lot in the day time when the temp is usually highest.
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      07-22-2009, 08:12 AM   #9
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Thanks all of you. I'll keep this in mind
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      08-13-2009, 02:46 PM   #10
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I have experienced this before in my '07 328. The fan is normally loud but one week last summer it began to sound like a jet plane rolling through the neighborhood. I did have the dealer examine it and they claim the thermostat was faulty. Replaced under warranty and all has been fine since. May be worth checking out.
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      08-13-2009, 02:50 PM   #11
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Quote:
Originally Posted by UnknownSpiritX5 View Post
I'm not sure if this is normal, but last night while I was parking, my 328i became very loud. At first I wasn't sure what it was, so I quickly turned the engine off and stepped outside to look. It seemed like the noise was coming from my fan compartment (I've never heard it be this loud). I started the engine again, and stepped outside and it was definitely coming from my fan.

I assumed the fan was moving much faster than other times probably because the engine heated up, but when I touched under the hood towards where the engine is located, it was weirdly cool and not as hot as I had suspected. INFACT, it was when I touched near my fan in the front, it was much hotter than the other surfaces on my hood, plus it was extremely loud.

So has this happened to anyone else before? Should I be worried about some part(s) not functioning as they should be? Could this be due to driving in sport mode (I accelerated and decelerrated perhaps way too much causing stress on the engine?) But I assume this car was built to handle that?

Also, my AC wasn't on, if that has to do with anything.

Any suggestions would be helpful! Thanks!
Relax it's completly normal, especially on hot-n-humid days. It always comes on after you driven a while and the engine is hot. I'd be more worried if I stoped hearing that fan.
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      08-13-2009, 03:37 PM   #12
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I've had the same problem on my e46. It feels sluggish, wouldn't accelerate as quick, and made crazy loud noises right? Got me so paranoid. Is this still an issue with the new e90? I was always so scared to take the car on long road trips. I currently drive an 07 accord and don't have this problem. Has anyone had any issues taking the new e90's on long road trips?
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      07-21-2010, 06:42 PM   #13
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I have this problem. It happens when it is hot out and I have been driving for a little bit. At time it sounds like a jet. I was also told this was normal but I do not hear any car sounding as loud as this. It sounds like the engine is going to explode. It can't be normal. Has anyone found out if replacing the thermostat has corrected the problem.
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      07-21-2010, 11:24 PM   #14
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Quote:
Originally Posted by MrCharlie View Post
I have experienced this before in my '07 328. The fan is normally loud but one week last summer it began to sound like a jet plane rolling through the neighborhood. I did have the dealer examine it and they claim the thermostat was faulty. Replaced under warranty and all has been fine since. May be worth checking out.
Same here. Lound noise even in moderate winter conditions (albeit Houston). Anyway, at the time, I checked the water temperature by playing with the hidden board computer and noticed that the temperature was running out of control (110C) when idling without a/c turned on. Brought it to the dealer who replaced the thermostat under warranty. No more jets taking off.

Well... Last week, with outside temperatures around 105F, and airconditioning running, I did hear the fan. But never as loud as it had been in the winter. And yes, our cars have a variable speed drive fan. And a variable speed drive water pump - if you really want to know. Cooling water temperature at cruising speed is about 99C (more fuel economic). Aggressive driving will result in a pratically immediate response of the system resulting in a cooling temperture drop to about 85C (more power).
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      08-07-2010, 10:39 AM   #15
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Just a follow up from my first post: I have brought my car my service center and again explained the situation. I got the same response that I usually get, that it a normal noise for the car...., other people bring it in with the same issue and not to worry about it. I asked them specifically to run a diagnostic on the thermostat. Sure enough, I got a call a couple days later letting me know they put a new thermostat in the car. If anyone has this issue don't let the dealer tell you it is normal. I have not got the car back yet to notice the difference but I'm sure this should fix the problem
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      08-07-2010, 10:56 AM   #16
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Its normal. This is one of the loudest cars I have ever heard when it is above 90 out and the AC is on.
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      05-24-2011, 01:20 PM   #17
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me to same car same year same problem exept no warinty and it cost me 120.00 and i put it in myself fun fun but it did fix the problem.
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      08-04-2011, 09:26 PM   #18
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My 07 328i is also very loud. it was so loud today that when I was ordering some Ice cream from DQ the lady said that she couldn't hear me over my car. Talk about embarrassing owning a BMW and somebody tells you that. Should I replace the thermostat or should I just let it be? It sounds like other people have this problem as well. And when I drive it cools down and the noise is over. The temp was 81 and sunny no humidity. don't know if this helps.
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      08-04-2011, 09:33 PM   #19
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Mine Does That Too... Bmw Service Advisor Said, Its Normal..

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      08-04-2011, 11:17 PM   #20
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Mine is loud, even right after I turn it off. I kill mine though because I always use Steptronic - I can't remember the last time I drove in D or DS. If I pull up and my family is outside or to someone I know, they always ask me about why my car is so loud. My Range Rover on the other hand barely uses its fan.
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      08-04-2011, 11:50 PM   #21
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The timing of this thread is great! I've been meaning to ask about my fan noise as well since it's been getting pretty loud at times and was getting a bit concerned. Sometimes it does sound like a jet although I sadly can't reach jet speeds in a 328. I might go get the thermostat checked. For those that managed to get it diagnosed as a thermostat issue, did you manage to get the stealership to run the diag for free or just decide to take a chance and hope they do find something and replace it under warranty?
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      08-05-2011, 07:54 PM   #22
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+1 on the paying for diagnostic or not.
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