Low Coolant Level with No Sign of External Leaks
BMW technical service bulletin 170114 for 2013-2014 BMW 328I, 2013-2014 BMW 335I and 2014 BMW 328D and others.
- Bulletin number
- 170114
- Component
- Power train
- Summary
- Low Coolant Level with No Sign of External Leaks. The Low Coolant Warning light is on and there are no signs of a visual leak. Pressure testing the cooling system may or may not show an internal leak (loss of pressure). There may also be a complaint of transmission fluid leaking from the vent on top of the transmission; poor shift quality; or a shuddering from the transmission. There is an internal failure of the automatic transmission oil cooler, allowing coolant to mix with transmission fluid. Possible faulty coolers were built between 6/6/2013 and 8/4/2013.
Owners of these vehicles have filed 77 complaints in the transmission category.
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