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August 28, 2019 Service bulletin

Fix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks

Kenworth technical service bulletin 42-056 for 2016-2019 Kenworth T680, 2015-2016 Peterbilt 379 and 2015-2020 Peterbilt 579 and others.

Bulletin number
42-056
Component
Engine and engine cooling
Summary
Fix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks. Brass fittings are available to replace the composite fittings.

Owners of these vehicles have filed 9 complaints in the engine category.

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