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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 04-27-2005, 06:47 PM   #1 (permalink)
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Ok, so the "check Engine" light comes on when I'm on my way to work today. As I am walking away from my car (at work) I can hear the blower (what I thought was the fan)...unusual so I remembered it...

I get in my car to leave...the car is completely dead...I jump it and come home...in my driveway I take a closer look and see that the radiator is blowing air (sounds like a blower) and the fan is just barely moving (like struggling to move)..

Can anyone help me out as to what the F**K is going on here...???

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Old 04-27-2005, 06:55 PM   #2 (permalink)
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what do you mean the radiator is blowing air?

the radiator fan is struggling too?

and why would the fan come on when you tried to start it up?......the engine was cold right?

edit: sorry i didn't see that you drove it home



well i guess if the battery is almost dead its possible, check the year/month of the battery on the side. then check the warranty. 95% of batteries will die about a month or two after their warranty expires (used to work at Advance Auto for a while)

the radiator blowing air though? where is the air coming from? sometimes the fan will stay on after shutoff to cool the engine b/c it can actually heat up after shutoff due to the lack of circulating air/coolant. if it was struggling it could be cause you have a bad battery. i dunno
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Old 04-27-2005, 06:58 PM   #3 (permalink)
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dude...if I knew why..I wouldn't be asking...

yes, the radiator is blowing air...and the fan is struggling to move...

its so obviously not the f'n battery...im not an idiot
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Old 04-27-2005, 07:13 PM   #4 (permalink)
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ok buddy i was just tryin to help. if you were that smart though you would know that a radiator CAN"T BLOW AIR! it has no fan, blades, etc. the only thing it can do is leak air, which you didn't say it had a leak..
you need to be more specific genius
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Old 04-27-2005, 08:50 PM   #5 (permalink)
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im all set with you and this thread...thanks...

the last thing I need is to argue with some asshole with nothing better to do...

I realize you were just trying to help...but you are the one who seems like you have no idea what you are talking about....

air is blowing from the back of the radiator (on the inside - facing the engine bay) I could feel it with my hand....
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Old 04-27-2005, 09:04 PM   #6 (permalink)
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Does anyone think this could be a fualty thermostat getting stuck "open"???
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Old 04-27-2005, 11:52 PM   #7 (permalink)
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Originally posted by RIBEMR26@Apr 27 2005, 10:04 PM
Does anyone think this could be a fualty thermostat getting stuck "open"???
[snapback]338592[/snapback]

There is an auxiliary fan in front of the radiator. You can see it through the grill. Could it have been on and blowing air through the radiator? I can't think of anything that could cause the radiator itself to blow air.


The fan is there to help with hot days, the a/c on, etc. As someone said, when you turn the engine off, there is nothing circulating to dissipate heat. So the fan might come on to help cool the silent engine.
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Old 04-28-2005, 02:21 AM   #8 (permalink)
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it's hard to diagnose the problem. Where in the radiator is the air coming from? Can you take a pic and put an arrow on the rough area?
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Old 04-28-2005, 02:31 PM   #9 (permalink)
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OK...YES

The air was coming from the auxilary fan in front of the radiator (which consequently I didn't realize was there, as it was almost dark when I got home)

Something is causing the auxilary fan to NOT shut off and it is killing the battery...the car started this morning but...I dont trust it....

Any ideas what could be causing the fan to continue to run with the car off...could it be a stuck thermostat "telling" the car that the radiator needs cooling?
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Old 04-28-2005, 03:33 PM   #10 (permalink)
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In general the electric fan runs when a temperature sensor which is usually screwed into the bottom of the radiator reaches a certain temperature. The fan will run even when the car is turned off until the temp falls below a set temp. It sounds like your car may have overheated because the regular fan wasn't working properly. As a result the aux. electric fan ran for a longer time than normal when the car was turned off in order to bring the temp dowm. This combined with a weak battery caused the battery to go dead.
If the car is overheating check the regular fan, waterpump, and thermostat. Also check for a weak battery. If the car is at normal operating temp, the aux fan should run for two or three minutes after the car is shut off. If it runs for a substantially longer time check the fan temp sensor.
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Old 04-29-2005, 01:27 PM   #11 (permalink)
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Thanks Gator...good lookin out
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Old 04-29-2005, 03:47 PM   #12 (permalink)
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Originally posted by RIBEMR26@Apr 29 2005, 02:27 PM
Thanks Gator...good lookin out
[snapback]339211[/snapback]

The sensor for the fan should be found on the passenger's side of the radiator. If you go to www.understeer.com and read about the "fan delete" mod, they show a picture of the sensor.
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