335d cooling fan question.. help..

Poloautoclub · 09-23-2015, 02:59 PM

2011 335d cooling fan will not turn on. brand new relay, new fan, everything is getting power as it should. Car overheats with no warning? I have a scan gauge hooked up so it tell me the engine temp. Starts dumping coolant at 210F when idling. Engine temp stays around 181F when driving even under load or hard driving in hot outside temps. Anyone can lead me in the right direction?

Hoooper · 09-23-2015, 03:13 PM

Starts dumping coolant at 210F? Thats way too low to be boiling over. Where is it boiling over from? The pressure bottle?

BB_cuda · 09-23-2015, 07:15 PM

What coolant temp should fan activate at?

fsd350 · 09-23-2015, 07:36 PM

The DDE uses several parameters including temperature, A/C system operation, ambient temperature to determine the proper fan speed and operation. i have had my fan runing and not running at 100c (212f) and below. 210 is way to low for coolant to boil. You may have a cracked reservoir which is fairly common on a BMW and/or insufficient coolant concentration. The boiling point of 50/50 coolant and water is 262f. Check the pressure cap also. Hope that helps

Hoooper · 09-23-2015, 08:12 PM

That's a good question. Mine only seems to run if the coolant temp is around 95c and up. It also runs most of the time when going slow and a/c is on.

BB_cuda · 09-24-2015, 10:44 AM

When on way home from cross country trip, I got caught in traffic jamb just west of Baton Rouge. I enabled temp display on cluster using the hidden menus on saw 90C on the display and engine fan wasn't running (A/C was off). I turned on heater first to dump heat without loading the engine and pulled display down to 84C. Curious if temp would increase again, I switched from heater back to A/C on and instantly heard the engine fan come on. Temps then pulled down to 79-80C.

If i hadn't done anything with the heater or A/C, I was curious how much hotter the coolant temp would have needed to get to activate the fan. Since serious Texas summer is now over, I'm not in position to try to make fan kick on without intervention. To be clear, when i turned on heater, the engine fan didn't come on. The cabin fan was rejecting the coolant's heat through heater core into cabin and i had windows down to not be baked.

Hoooper · 09-24-2015, 10:50 AM

Why turn the heat on and bake yourself when it's only 90c? No reason to get concerned until its quite a bit higher than that, like 120c. 90 is actually just about where it is supposed to run all the time.

BB_cuda · 09-24-2015, 02:37 PM

Quote:

Originally Posted by Hoooper

Why turn the heat on and bake yourself when it's only 90c? No reason to get concerned until its quite a bit higher than that, like 120c. 90 is actually just about where it is supposed to run all the time.

Only did it for about 5 minutes just to see if it helped. I'd always heard to do this and this was 1st time i ever tried it with true data read out. It came down pretty damn quick. Agree 90C isn't a problem point but i guess it was higher than my normally observed 82C. I saw where you told me that 88C is more the norm for coolant temp but this was after my trip. Thanks Hoop!

Poloautoclub · 09-25-2015, 02:07 AM

its coming from near the expansion bottle.. My AC compressor was also not kicking in and the belt would start squealing really loud. So temporarily in disconnected the compressor. not sure if that has to do with anything? BMW is sending me a new fan and i will have in tomorrow (friday). i had the fan tested and when we tried to activate it the fan would twitch/ hesitate to turn on so now i am waiting for the new fan to come in. I will get back tomorrow with new and good results hopefully...

Poloautoclub · 09-27-2015, 01:32 AM

Ok so the problem has been fixed! The wrong drain plug has been installed on the radiator causing the coolant to come out before the fan had the chance to kick in. when you get a new radiator for this car it comes with two drain plugs... a short one and a long one. I had the short one in which caused the problem. Im so happy this is fixed! Thank you guys for the assistance

09-23-2015, 02:59 PM	#1
Poloautoclub Enlisted Member 7 Rep 41 Posts Drives: 2011 M sport 335d Join Date: Feb 2013 Location: Woodinville WA iTrader: (0)	335d cooling fan question.. help.. 2011 335d cooling fan will not turn on. brand new relay, new fan, everything is getting power as it should. Car overheats with no warning? I have a scan gauge hooked up so it tell me the engine temp. Starts dumping coolant at 210F when idling. Engine temp stays around 181F when driving even under load or hard driving in hot outside temps. Anyone can lead me in the right direction? __________________ Polo at your service 2002tii m20t, z3m ISR Dinan, 99 750il V-12 Dinan, 01 740i M, 91 850i 6spd Dinan TT, 91 850i, 95 840ci s62, 2011 X5 Diesel, 2011 335d M
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09-23-2015, 03:13 PM	#2
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	Starts dumping coolant at 210F? Thats way too low to be boiling over. Where is it boiling over from? The pressure bottle?
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09-23-2015, 07:15 PM	#3
BB_cuda Brigadier General 796 Rep 3,572 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	What coolant temp should fan activate at?
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09-23-2015, 07:36 PM	#4
fsd350 Lieutenant 160 Rep 412 Posts Drives: 2010 BMW 335d Join Date: Mar 2015 Location: BFE iTrader: (0) Garage List 2014 BMW X6M [10.00] 2002 BMW e39 540i S ... [0.00] 2010 BMW 335d [9.25] 2006 BMW 760i [0.00] 1988 Pontiac GTA [0.00] 2007 KTM 990 Adventure [0.00] 2010 X5 35d [0.00] 2005 KTM 950 Adventure [0.00] 2012 BMW GS650GS Se ... [0.00] 2001 KTM 520EXC [0.00] 1989 Chevy IROC ASC ... [0.00] 1984 Dodge Ramcharg ... [0.00] 1997 Husaberg FC600 [0.00] 2015 Can-Am Outland ... [0.00] 2004 Ford F350 Supe ... [0.00]	The DDE uses several parameters including temperature, A/C system operation, ambient temperature to determine the proper fan speed and operation. i have had my fan runing and not running at 100c (212f) and below. 210 is way to low for coolant to boil. You may have a cracked reservoir which is fairly common on a BMW and/or insufficient coolant concentration. The boiling point of 50/50 coolant and water is 262f. Check the pressure cap also. Hope that helps
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09-23-2015, 08:12 PM	#5
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	That's a good question. Mine only seems to run if the coolant temp is around 95c and up. It also runs most of the time when going slow and a/c is on.
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09-24-2015, 10:44 AM	#6
BB_cuda Brigadier General 796 Rep 3,572 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	When on way home from cross country trip, I got caught in traffic jamb just west of Baton Rouge. I enabled temp display on cluster using the hidden menus on saw 90C on the display and engine fan wasn't running (A/C was off). I turned on heater first to dump heat without loading the engine and pulled display down to 84C. Curious if temp would increase again, I switched from heater back to A/C on and instantly heard the engine fan come on. Temps then pulled down to 79-80C. If i hadn't done anything with the heater or A/C, I was curious how much hotter the coolant temp would have needed to get to activate the fan. Since serious Texas summer is now over, I'm not in position to try to make fan kick on without intervention. To be clear, when i turned on heater, the engine fan didn't come on. The cabin fan was rejecting the coolant's heat through heater core into cabin and i had windows down to not be baked.
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09-24-2015, 10:50 AM	#7
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	Why turn the heat on and bake yourself when it's only 90c? No reason to get concerned until its quite a bit higher than that, like 120c. 90 is actually just about where it is supposed to run all the time.
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09-25-2015, 02:07 AM	#9
Poloautoclub Enlisted Member 7 Rep 41 Posts Drives: 2011 M sport 335d Join Date: Feb 2013 Location: Woodinville WA iTrader: (0)	its coming from near the expansion bottle.. My AC compressor was also not kicking in and the belt would start squealing really loud. So temporarily in disconnected the compressor. not sure if that has to do with anything? BMW is sending me a new fan and i will have in tomorrow (friday). i had the fan tested and when we tried to activate it the fan would twitch/ hesitate to turn on so now i am waiting for the new fan to come in. I will get back tomorrow with new and good results hopefully... __________________ Polo at your service 2002tii m20t, z3m ISR Dinan, 99 750il V-12 Dinan, 01 740i M, 91 850i 6spd Dinan TT, 91 850i, 95 840ci s62, 2011 X5 Diesel, 2011 335d M
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09-27-2015, 01:32 AM	#10
Poloautoclub Enlisted Member 7 Rep 41 Posts Drives: 2011 M sport 335d Join Date: Feb 2013 Location: Woodinville WA iTrader: (0)	Ok so the problem has been fixed! The wrong drain plug has been installed on the radiator causing the coolant to come out before the fan had the chance to kick in. when you get a new radiator for this car it comes with two drain plugs... a short one and a long one. I had the short one in which caused the problem. Im so happy this is fixed! Thank you guys for the assistance __________________ Polo at your service 2002tii m20t, z3m ISR Dinan, 99 750il V-12 Dinan, 01 740i M, 91 850i 6spd Dinan TT, 91 850i, 95 840ci s62, 2011 X5 Diesel, 2011 335d M
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