Fan Not turning on when car heats up - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 02-20-2006, 08:26 AM
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Fan Not turning on when car heats up

Well, I just got my car back from being re-built, because it overheated. Spent about 2,700 to fix entire engine and clutch setup. Well the car moves great, I love it. But this overheating thing is really getting to me. After getting the car back from shop, let the car sit at a light while I made a call, noticed the needle starting to move to hot. Opened the hood and the fan was not on. Turned the AC on the fan kicks up and the needle dropped. OK so Temp sensor has to be bad. Ordered one from the Stealership for a good price about 50 bucks. Jumped the fan to low speed until it got in. Problem with jumping fan is car stays cool and no heat inside. Ahhh Finally got new sensor replaced old one. However I let the car sit for about 20 minutes and fan never turned on. Car did not overheat but I didnt want to wait until it did. Any clues on what this could be, its driving me crazy.
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#2 (permalink) Old 02-20-2006, 08:36 AM
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the fan only turns on when you're going like 5 or 10 mph, it doesn't turn on when standing still

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#3 (permalink) Old 02-20-2006, 09:36 AM
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Temp sensor wont trigger the fan if no hot water is going thru it. Check the thermostat.
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#4 (permalink) Old 02-20-2006, 12:13 PM
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ok guys get this shit, when i let me car run for more than like 8 mins the neddle starts climbing and never stops till i either start moving or it over heats. Once i start driving the heat plumits and goes back to normal. My fan also doesnt ever kick on when im parked but you would think if you car was gonn over heat it would come on. Its been like this for about 2 weeks and i know its not a good thing to be driving it but i dont have a choice and cant afford to dump anymore money into this car. So is it the fan, the thermostat or the tempsensor? Please help me. Thanks lot. Bob318
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#5 (permalink) Old 02-20-2006, 01:25 PM
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Well, I recently got the car rebuilt new Water Pump new Radiator new Thermostat, new everything pretty much, so.... The only thing I didnt replace was that sensor, so I bought it and it still doesnt kick the fan on. I think its kind of silly that it will only turn on when the car is moving. So the car will overheat and not attempt to turn the fan on. I dont know that doesnt really make sense to me. Any other ideas?
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#6 (permalink) Old 02-20-2006, 05:47 PM
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Ok, first of all teh fan will turn on any time the thermostat says it should. If it did not turn on while your car was sitting still your car would overheat quite quickly. Infact the fan does not run that often when you are moving because there is enough air moving through your engine compartment that the fan has nothing to do.

I would check and make sure that the thermostat was installed properly. If it is not the thermostat then it could be the fan itself. But these problems are usually the thermostat.
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#7 (permalink) Old 02-21-2006, 12:30 AM
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Word man, thats what i was thinking. It would be so lame if the fan just didnt turn on when you wernt moving. That would be so worthless. My fan doesnt turn on at all. Ive never let it over heat but it get up to half way on the gage when its 15 degrees outside in less than 5 minutes when im not moving.Its bad news.
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#8 (permalink) Old 02-21-2006, 07:54 AM
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Thermostat huh, Well it was just replaced, I brought the car back to the mechanic told him dont call me until you can let the car sit turned on for a half hour with no problems.
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#9 (permalink) Old 02-21-2006, 09:50 AM
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One cheap way to do it would be to mount a $5 switch on your dashboard and turn on the darn thing whenever you wanted it on.



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#10 (permalink) Old 02-21-2006, 10:08 AM
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There are 2 fans right? The belt driven fan attached to the waterpump shoudl spin all the time.. this is the fan that does most of the cooling. The other fan (aux fan) only turns on when the A/C is engaged or in extreme heat where the engine needs that little extra. Now, which fan are you reffering to that doesn't spin?

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#11 (permalink) Old 02-21-2006, 10:09 AM
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Yeah I was thinking about putting a darn switch, just mad that I've paid so much already, and still that darn switch dont work.

To answer your question 93 I only have 1 fan the one in between the motor and radiator, I dont have this AUX fan in front of the radiator, in fact I never had it.
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#12 (permalink) Old 02-21-2006, 11:09 AM
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Should be two fans...

Are you saying you only have one fan, an electric one, its behind the radiator, and its not coming on? Someone removed your belt driven fan that's normally mounted on the motor? If that's the case, I would reinstall the belt driven fan and put the factory installed aux cooling fan back behind the grill the way the car was designed.






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#13 (permalink) Old 02-21-2006, 12:06 PM
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I'll double check, but yeah I'm pretty sure theres only one big fan write in front of the motor mounted to the Radiator. I have a 318IS, maybe its different between models. But there is only one fan on from what I see.
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#14 (permalink) Old 02-21-2006, 02:10 PM
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I only have one fan inbetween my motor and my radiator. I dont know waht you guys are talkin about 2 fans. Are you sure they had the aux on 95 and older? cause mine doesnt have one. Im finaly just bringing my car in on friday so if i figure it out ill let you know.
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#15 (permalink) Old 02-21-2006, 02:58 PM
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An electric puller fan behind the radiator is actually a much more desireable setup than the factory belt driven fan. A company called Trimline makes a great fan to put there, cools better than factory and frees up the pully system.

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Originally Posted by Hamfisted
Are you saying you only have one fan, an electric one, its behind the radiator, and its not coming on? Someone removed your belt driven fan that's normally mounted on the motor? If that's the case, I would reinstall the belt driven fan and put the factory installed aux cooling fan back behind the grill the way the car was designed.






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