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BMW 3-Series (E90 E92) Forum
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Loosing coolant.
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05-11-2024, 07:43 PM | #1 |
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Loosing coolant.
2011 bmw 335xi 133k miles. Replaced radiator, water pump, thermostat, plastic hose that runs on k member, coolant tank and hose on driver side to trans cooler. It seems to be blowing coolant out driver side area once it gets up to temp. Doesn’t over heat seems like there could be a blockage in the system. I just got this car and issue occured on my way home. If I make short trips I have no issues with the car but can’t drive for longer than 20-30 minutes. Any input on this?
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05-11-2024, 09:17 PM | #2 | |
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Vapor Pressure of Coolant will remain due to engine temperature transferring heat to coolant. System will LEAK the SAME or perhaps MORE than if engine were running. You may need to put front wheels on ramps, remove Splash Shield under engine, & locate leak from BENEATH engine. Many folks believe they need a "Pressure Tester" to physically "Pump Up" pressure in system. That is NOT the case. Why is there a "Pressure CAP" on the Coolant Reservoir? Why is 20 PSIG cap used? Why is max pressure using Tester 1.5 Bar (21.7 PSIG)? George |
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05-11-2024, 09:19 PM | #3 | |
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05-11-2024, 09:59 PM | #6 |
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What I thought. So here is your very likely issue. The radiator has the wrong drain plug, one for manual.
This is quite an issue because it goes undetected in a pressure test. It leaks when atf comes to temperature and trans cooler opens. This pressurizes above the drain plug where there is no seal due to the incorrect plug. Leak. Can strand you and overheat the transmission.
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05-12-2024, 02:04 AM | #8 |
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