Question 1

What are the symptoms of a failing Cooling System on a NCV3 Sprinter?

Accepted Answer

Temperature gauge climbing while towing, on grades, or in traffic Coolant level dropping with no puddle, or sweet smell at the front of the van Cabin heat that only works at speed, or a slow warm-up in cold weather Cooling fan running constantly or not engaging at all

Question 2

Which fault codes point to this NCV3 Sprinter repair?

Accepted Answer

P0128: Coolant thermostat below regulating temperature. P0116 / P0117 / P0118: Coolant temperature sensor range or performance. P0480 / P0481: Cooling fan control circuit. P0217: Engine overtemperature condition. Confirm with a scan tool before ordering — codes narrow the system, not the exact part.

Question 3

Does Mercedes Sprinter Thermostat Assembly (Unheated) – OEM Wahler | OM642 3.0L | #6422002015 fit my Sprinter?

Accepted Answer

Listed for NCV3 Sprinter, 2010–2023, OM642 engine. Cross-reference 6422002015 against the number on the component you are replacing. Listed for the NCV3 generation (2007–2018). Part numbers can differ within a generation by year and engine code — send the VIN and we'll confirm the exact number. This part is listed for the OM642 engine code. Confirm the code on your engine data plate or build sheet matches before ordering.

Mercedes Sprinter Thermostat Assembly (Unheated) – OEM Wahler | OM642 3.0L | #6422002015

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