Jb4 n54 post install issue

nkspear · 04-03-2016, 06:34 PM

Just installed a G4 jb4 for my 07 335i.
Install was smooth and the car had no errors or lights after the first start up. I started to drive in map 1 and noticed a loud fan blowing noise. I drove to a destination and got out to hear the fan blowing at what I would guess full speed. The car hadn't even completely warmed up. I turned off the jb4 and the fan cut down to normal after about 10 seconds. Anyone ever experienced this?

Antetokounmpo · 04-03-2016, 06:57 PM

max cool mode might be on or your water pump is about to go.

mike@x-ph.com · 04-04-2016, 01:19 PM

Quote:

Originally Posted by Heel Toe

max cool mode might be on or your water pump is about to go.

+1

Start by checking max cool mode setting

Jeff@TopGearSolutions · 04-04-2016, 05:26 PM

Max cool mode or maybe you want to reset adaptation. Sometimes the addition of tunes trigger the coolant sensor to trigger the fans. I've had it happen a bunch of times on various tunes.

04-03-2016, 06:34 PM	#1
nkspear New Member 3 Rep 13 Posts Drives: 2007 E92 335i MT Join Date: Nov 2015 Location: Raleigh, NC iTrader: (0)	Jb4 n54 post install issue Just installed a G4 jb4 for my 07 335i. Install was smooth and the car had no errors or lights after the first start up. I started to drive in map 1 and noticed a loud fan blowing noise. I drove to a destination and got out to hear the fan blowing at what I would guess full speed. The car hadn't even completely warmed up. I turned off the jb4 and the fan cut down to normal after about 10 seconds. Anyone ever experienced this?
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04-03-2016, 06:57 PM	#2
Antetokounmpo Brigadier General 1560 Rep 3,475 Posts Drives: E90 6MT FBO; '18 F150 Platinum Join Date: Jul 2013 Location: WI iTrader: (3) Garage List 2018 Ford F-150 Pla ... [0.00] 2008 BMW 335xi [0.00]	max cool mode might be on or your water pump is about to go. __________________ 2008 335xi 6MT \| VRSF Catless DP \| VRSF 7" FMIC \| VRSF CP \| TIAL BOV \| DCI \| MHD 2+ BC Racing BR \| Stoptech 600 \| Firehawk Indy 500 255 Square \| Atric Altimax 225 Sq. 2018 F-150 Platinum 701A \| FX4 \| 3.5 EcoBeast
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04-04-2016, 05:26 PM	#4
Jeff@TopGearSolutions 3474 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Max cool mode or maybe you want to reset adaptation. Sometimes the addition of tunes trigger the coolant sensor to trigger the fans. I've had it happen a bunch of times on various tunes.
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