Still losing coolant after pressure test! Help!

theslowe90 · 09-02-2019, 11:37 AM

My car is losing coolant for some reason.... The last time I did a coolant flush was two months ago, and today when I checked the coolant, it is already below the MIN level (no warning yet). What's really weird was that I did a pressure test before the coolant flush and it showed no signs of leaks as the pressure did not drop over a 5 minute period.... Please help!

Supermoon · 09-02-2019, 06:24 PM

Most likely your coolant reservoir is cracked. Mind did last year and it's common.

theslowe90 · 09-03-2019, 10:05 AM

Quote:

Originally Posted by Supermoon

Most likely your coolant reservoir is cracked. Mind did last year and it's common.

That's weird cause I see no signs of dried coolant near the reservoir though...

weehe126 · 09-03-2019, 11:38 AM

Did you bleed the system after the coolant flush? From max to min in 2 months is not bad after a flush.

theslowe90 · 09-03-2019, 12:54 PM

Quote:

Originally Posted by weehe126

Did you bleed the system after the coolant flush? From max to min in 2 months is not bad after a flush.

Yep I did that. (ac max heat and floor accelerator for 10 seconds)

weehe126 · 09-03-2019, 04:26 PM

I'd just top it off and check again in a month. Possibly some air that was still in the system. Really only 3 places it can leak, cracked expansion tank, into oil in the OFH, at the radiator connection.

theslowe90 · 09-03-2019, 09:08 PM

Quote:

Originally Posted by weehe126

I'd just top it off and check again in a month. Possibly some air that was still in the system. Really only 3 places it can leak, cracked expansion tank, into oil in the OFH, at the radiator connection.

Okay, I will keep an eye on the coolant level. Thanks!

09-02-2019, 11:37 AM	#1
theslowe90 Private First Class 31 Rep 112 Posts Drives: 2011 BMW 335i Sedan Join Date: Mar 2019 Location: Florida iTrader: (0) Garage List 2011 BMW 335i [0.00]	Still losing coolant after pressure test! Help! My car is losing coolant for some reason.... The last time I did a coolant flush was two months ago, and today when I checked the coolant, it is already below the MIN level (no warning yet). What's really weird was that I did a pressure test before the coolant flush and it showed no signs of leaks as the pressure did not drop over a 5 minute period.... Please help! Last edited by theslowe90; 09-02-2019 at 05:28 PM..
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09-02-2019, 06:24 PM	#2
Supermoon Lieutenant 166 Rep 429 Posts Drives: 2011 e92 335xi Join Date: Aug 2015 Location: Seoul iTrader: (6) Garage List 2011 BMW 335i xDriv ... [10.00]	Most likely your coolant reservoir is cracked. Mind did last year and it's common. __________________ 2011 E92 335i xDrive Pure Stage 1 \| DV+ & Inlet \| Injen Intake \| M3 Cowl \| ETS 5" FMIC & CP \| Aquamist HFS4 Direct Port \| CSF Radiator \| Wagner Catted DP \| BMW PE \| Apex FL-5 \| Michelin PS4S \| 335is Engine mount \| SDW Monoball thrust arms \| UUC Swaybars & SS Brake lines \| Bilstein B8 \| Dinan Springs & Shock mounts \| Whiteline RSFB \| M3 Rear Control arms \| Manzo Toe arms \| Wavetrac LSD
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09-03-2019, 11:38 AM	#4
weehe126 Brigadier General 1189 Rep 3,228 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Did you bleed the system after the coolant flush? From max to min in 2 months is not bad after a flush.
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09-03-2019, 04:26 PM	#6
weehe126 Brigadier General 1189 Rep 3,228 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	I'd just top it off and check again in a month. Possibly some air that was still in the system. Really only 3 places it can leak, cracked expansion tank, into oil in the OFH, at the radiator connection.
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