Fan blowing full blast for a split second

Limit · 04-06-2017, 08:12 PM

Hope can get some advice.

I have recently noticed that the vent blowing full blast for a split second and then back to normal. Happened a couple of times already while driving on the highway.

FYI, electric coolant pump was recently replaced, but not the thermostat, not sure if it is related

Any help is greatly appreciated.

m5james · 04-06-2017, 10:42 PM

I get it randomly as well, no clue.

-c- · 04-08-2017, 02:42 PM

Quote:

Originally Posted by Limit

Hope can get some advice.

I have recently noticed that the vent blowing full blast for a split second and then back to normal. Happened a couple of times already while driving on the highway.

FYI, electric coolant pump was recently replaced, but not the thermostat, not sure if it is related

Any help is greatly appreciated.

I've been told it's the beginning of the end for your water pump.

m5james · 04-14-2017, 09:12 PM

Water pump? We're talking about the interior fan for the climate control, not the engine fan.

-c- · 04-15-2017, 11:02 AM

Quote:

Originally Posted by m5james

Water pump? We're talking about the interior fan for the climate control, not the engine fan.

Lol. My bad, reading these on my phone sometimes don't catch the small print

dreamalaska · 05-07-2017, 02:03 AM

Does this do this randomly while driving? Mine will blast the front defrost for a few seconds on startup if it's rainy and cool outside, but otherwise acts normal...

BMW-SRT · 05-13-2017, 12:08 PM

This happend to me for the 1st time a couple days ago when i switched the vent to blow from the top and bottom, when i switched it back to only blow from dash vents it stopped/was back to normal, so weird.

n_sievers · 05-18-2017, 10:04 PM

This regularly occurs for me, especially if the sunroom is open. When I had in for service a brought it up and was advised that is was "normal vehicle function". Not sure I believe it but they would not discuss any further.

Limit · 05-19-2017, 09:36 AM

I have started noticing a trend that the interior vent blowing full blast for a split second when:

1. Quickly accelerate to highway speed
2. Outside temperature around 10 celsius when inside temperature is set to 16 celsius
3. Fan setting is set to lowest

Could this be the symptoms of a failing final stage resistor (FSR)?

04-06-2017, 08:12 PM	#1
Limit Registered 0 Rep 3 Posts Drives: 2011 BMW X6 35i Join Date: Apr 2017 Location: Canada iTrader: (0)	Fan blowing full blast for a split second Hope can get some advice. I have recently noticed that the vent blowing full blast for a split second and then back to normal. Happened a couple of times already while driving on the highway. FYI, electric coolant pump was recently replaced, but not the thermostat, not sure if it is related Any help is greatly appreciated.
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04-06-2017, 10:42 PM	#2
m5james Colonel 431 Rep 2,062 Posts Drives: '10 X5M Alpine White on Sakhir Join Date: Aug 2015 Location: Marysville, WA iTrader: (0)	I get it randomly as well, no clue.
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04-14-2017, 09:12 PM	#4
m5james Colonel 431 Rep 2,062 Posts Drives: '10 X5M Alpine White on Sakhir Join Date: Aug 2015 Location: Marysville, WA iTrader: (0)	Water pump? We're talking about the interior fan for the climate control, not the engine fan. __________________ '10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2" '98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's '97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's
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05-07-2017, 02:03 AM	#6
dreamalaska Private 5 Rep 63 Posts Drives: 2013 X6 3.5i Join Date: May 2012 Location: Alaska iTrader: (0)	Does this do this randomly while driving? Mine will blast the front defrost for a few seconds on startup if it's rainy and cool outside, but otherwise acts normal...
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05-13-2017, 12:08 PM	#7
BMW-SRT First Lieutenant 170 Rep 347 Posts Drives: C63sAMG, GLC63sAMG, x5m, 335i Join Date: Jan 2011 Location: Cen-Cal iTrader: (0)	This happend to me for the 1st time a couple days ago when i switched the vent to blow from the top and bottom, when i switched it back to only blow from dash vents it stopped/was back to normal, so weird.
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05-18-2017, 10:04 PM	#8
n_sievers Private 2 Rep 73 Posts Drives: 2012 X6M Monte Carlo Blue Join Date: Aug 2012 Location: Denver, CO iTrader: (0) Garage List 2012 X6M [0.00]	This regularly occurs for me, especially if the sunroom is open. When I had in for service a brought it up and was advised that is was "normal vehicle function". Not sure I believe it but they would not discuss any further.
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05-19-2017, 09:36 AM	#9
Limit Registered 0 Rep 3 Posts Drives: 2011 BMW X6 35i Join Date: Apr 2017 Location: Canada iTrader: (0)	I have started noticing a trend that the interior vent blowing full blast for a split second when: 1. Quickly accelerate to highway speed 2. Outside temperature around 10 celsius when inside temperature is set to 16 celsius 3. Fan setting is set to lowest Could this be the symptoms of a failing final stage resistor (FSR)?
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