The lower radiator coolant return hose may come in contact with the secondary air system check valve...
BMW technical service bulletin B170100 for 1999 BMW 540I and 1999 BMW 740I.
- Bulletin number
- B170100
- Component
- Engine and engine cooling
- Summary
- The lower radiator coolant return hose may come in contact with the secondary air system check valve flange gasket when the engine coolant is at operating temperature due to coolant system pressure and expansion of the hose.
Owners of these vehicles have filed 7 complaints in the engine category.
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