Check a VIN

March 30, 2026 Service bulletin

Complaint No heating output is available during electric driving operation

Mercedes-Benz technical service bulletin LI83.70-P-080411 for 2022-2026 Mercedes-Benz C300, 2025-2026 Mercedes-Benz E350 and 2023-2026 Mercedes-Benz GLC 300 and others.

Bulletin number
LI83.70-P-080411
Component
Visibility/wiper
Summary
Complaint No heating output is available during electric driving operation. In conventional (combustion engine) driving operation, full heating output is available. Cause Possible defect in the N33/5 water heater (high-voltage PTC booster heater) Remedy If the N33/5 water heater (PTC booster heater, high voltage) is defective, it must be replaced with the latest part number. Note: Please refer to the information in XENTRY Parts Information and the latest WIS description. For vehicles manufactured before December 2025 with a BorgWarner water heater, the coolant hoses (inlet and outlet) must also be ordered and installed. For vehicles produced after December 2025, only the N33/5 water heater (PTC booster heater high voltage) needs to be replaced.

Owners of these vehicles have filed 5 complaints in the visibility category.

Vehicles covered

VIN decoder

See the problems and recalls for an exact car

Buying a used Mercedes-Benz C300?

Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.

Check its history