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July 1, 2020 Service bulletin

Coolant leak from low temperature cooling circuit (N63R)

BMW technical service bulletin B170617 for 2019-2020 BMW X5, 2017-2020 BMW 530I and 2016-2019 BMW 750LI and others.

Bulletin number
B170617
Component
Engine
Summary
COOLANT LEAK FROM LOW TEMPERATURE COOLING CIRCUIT (N63R): Coolant leaking from the engine compartment. Traces of coolant leaking from the expansion tank of the low temperature cooling system. Aluminum corrosion in the charge air intercoolers, or in the radiator for the low temperature cooling is causing an unfavorable chemical reaction to the coolant.

Owners of these vehicles have filed 186 complaints in the engine category.

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