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2011 BMW 328i - coolant leak #4677105
02/25/18 12:04 AM
02/25/18 12:04 AM
Joined: Apr 2008
Posts: 1,830
IL
Ndx Offline OP
Ndx  Offline OP
Joined: Apr 2008
Posts: 1,830
IL
Hi Guys,

I'm trying to find coolant leak... Has anyone used the UV dyes ?
Do I just add it too coolant ?, Do I have to flush system after ?

Are those dyes universal or coolant specific ? If specific any recommendations for Bmw coolant.

Thank you

Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4677190
02/25/18 03:35 AM
02/25/18 03:35 AM
Joined: Dec 2011
Posts: 4,738
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,738
North Carolina
You simply add the due to the coolant, however;

An external coolant leak should be fairly obvious even without a dye.

How much are you losing? If you can't see crusty coolant trails it may be the heater core or internal.


"Zed's dead baby, Zed's dead."
Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4677288
02/25/18 08:30 AM
02/25/18 08:30 AM
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Pressure test the system to find leaks, the coolant is already blue. Ive been having a run on radiators and expansion tanks on the E9x's lately. Get it up in the air take the panel off and look from the bottom.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4677325
02/25/18 09:07 AM
02/25/18 09:07 AM
Joined: Apr 2008
Posts: 1,830
IL
Ndx Offline OP
Ndx  Offline OP
Joined: Apr 2008
Posts: 1,830
IL
It's leaking on outside but I think only while driving or super hot.
I see drips on driveway but even that does not help pin point....

I had oring on filter cap fail and spray everything around so that does not help lol it's mess there ... I don't want to wash engine in winter ...

Thx guys

Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4677426
02/25/18 10:53 AM
02/25/18 10:53 AM
Joined: Sep 2004
Posts: 7,518
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,518
Marshfield , MA
Later model BMWs plastic cooling parts have a rising failure rate as the car approaches 100K miles. The old, last 30 yrs plus stuff, wasn't recyclable enough.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4677430
02/25/18 10:57 AM
02/25/18 10:57 AM
Joined: Feb 2014
Posts: 2,490
Canada
Lolvoguy Offline
Lolvoguy  Offline
Joined: Feb 2014
Posts: 2,490
Canada
Doing a cooling system "overhaul" once every 80k miles, seems to be very common on these cars as complete kits are readily available:

https://www.fcpeuro.com/products/bmw-cooling-system-overhaul-kit-e46-oem-e46coolkit


06 Lexus IS350- Wife
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Re: 2011 BMW 328i - coolant leak [Re: Lolvoguy] #4678515
02/26/18 10:15 AM
02/26/18 10:15 AM
Joined: Apr 2010
Posts: 4,398
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,398
Storrs, Connecticut
Originally Posted By: Lolvoguy
Doing a cooling system "overhaul" once every 80k miles, seems to be very common on these cars as complete kits are readily available:

https://www.fcpeuro.com/products/bmw-cooling-system-overhaul-kit-e46-oem-e46coolkit





That's for the E46, the OP is talking about an E90 generation car.

OP: How many miles on the car? Check the plastic coolant hose connectors for white residue or drips. The o-rings on the connectors like to leak and the plastic hoses crack. My GF's E90 cracked the coolant hose with the sensor on the passenger side. The hose cracked right where the sensor mounts onto the connector.

Also have you replaced the oil filter housing gasket yet? The gasket gets brittle over time and can cause coolant and oil to mix. Like stated above also check the expansion tank and cap for white residue. The tanks crack and the caps fail, causing them to lose pressure and leak.


2000 Jeep Cherokee 4.0L (180k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (33k) - Castrol Edge Euro 0w40, MANN HU816X
Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4678608
02/26/18 11:55 AM
02/26/18 11:55 AM
Joined: May 2015
Posts: 1,992
America
Alfred_B Offline
Alfred_B  Offline
Joined: May 2015
Posts: 1,992
America
Probably a hairline crack on the coolant expansion tank if it only happens when super hot. E46 has that issue, I thought they had fixed it for E90.

Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4678868
02/26/18 04:30 PM
02/26/18 04:30 PM
Joined: Nov 2006
Posts: 19,906
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,906
MA, Mittelfranken.de
The dye works well with a UV light, get one for coolant (dexcool has a different one) run it and pressurize it then start looking.
I would bet its from some plastic part that is cracked on these.


ASE L1, Master. Deutsch Meisterbrief.
Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4679275
02/26/18 10:48 PM
02/26/18 10:48 PM
Joined: Mar 2010
Posts: 818
Minneapolis
antonmnster Offline
antonmnster  Offline
Joined: Mar 2010
Posts: 818
Minneapolis
My radiator developed a slow leak in a corner around 120k. be THANKFUL you don't have a 335. That job brought me to tears - it's like the assembled the unibody around the radiator.

Pay attention to where the puddle is when you park it. Is it right at the front? Driver side? Passenger? Those can be big clues. Otherwise don't be afraid to get under it and pop the splash shield off. Take a good look around the water pump, the big electric pump hanging off the passenger front corner of the block. Odds are highest that it's the pump. Just a heads up, it ain't cheap, and it ain't easy to get to.

Re: 2011 BMW 328i - coolant leak [Re: Ndx] #4679526
02/27/18 10:43 AM
02/27/18 10:43 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
On an E90, first thing to check is the expansion tank and the water pump.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
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