Hella 354777921 Engine Coolant Thermostat
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Hella

Hella 354777921 Engine Coolant Thermostat

Brand Hella 354777921
Assy/Disassy by Qualified Personnel Required! .
Opening Temperature [°C] 92
Opening Temperature [°F] 197.6
Supplementary Article/Supplementary Info With seal
Fits Mercedes-Benz · 27 vehicles

OE-style thermostat. Helps the engine reach optimum temperature quickly.

Wax and electric heating. Supports a fuel-saving higher operating temperature.

With seal. Includes the seal for a complete thermostat service.

Cross-references Facet 7.8929, Nissens 92837 and VEMO V30-99-0201 for the same application. See all 6.

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Not what you need? See all Engine Coolant Thermostat options

Engine Cooling Control for Mercedes-Benz

This Hella engine coolant thermostat helps regulate coolant flow so the engine can reach and maintain the proper operating temperature. It is a direct-fit service part for select Mercedes-Benz diesel and gasoline models, including GLS350d, GLE350d, ML350, E350, R350, S350, GL350, GL320, ML320, and R320 applications.

Part number 354777921 is built around a 92°C opening temperature and includes a seal for service replacement. If you are replacing a thermostat on a Mercedes-Benz ML350, E350, or GL350, this Hella thermostat supports stable temperature control and consistent cabin heat performance.

  • Opening temperature: 92°C / 197.6°F
  • Includes seal for installation
  • Helps the engine reach operating temperature quickly
  • Supports fuel-efficient higher operating temperature control
  • Fits select Mercedes-Benz GLS350d, GLE350d, ML350, E350, R350, S350, GL350, GL320, ML320, and R320 models

Thermostat Function and Fitment

The coolant thermostat is a key part of the engine cooling system. On select Mercedes-Benz ML350, E350, and GL350 vehicles, it manages coolant circulation so the engine warms up promptly and stays within the intended temperature range. Hella uses a wax thermostat design with an electric heating element to support precise temperature regulation under changing driving conditions. Part number 354777921 cross-references Nissens 92837 for the same application.

Common Problems This Part Can Address

  • Slow engine warm-up after cold starts
  • Temperature fluctuations during normal driving
  • Cabin heat that takes too long to become available
  • Cooling system operation that does not maintain the expected temperature range
  • Thermostat replacement during cooling system service

Installation Notes

Assy/disassy by qualified personnel required. Inspect the cooling system housing, mating surfaces, and coolant condition before installation. Replace the seal as part of the service, and follow the vehicle manufacturer’s bleed and refill procedure after installation. Verify the opening temperature specification matches the vehicle application before fitting.

Quality Assurance

Hella thermostats are engineered for a wide range of passenger and commercial vehicle cooling systems, with application coverage that includes modern thermostat designs and OE-style service replacements. Part number 354777921 is specified with a 92°C opening temperature and seal for the listed Mercedes-Benz applications.

Related reading

This part fits 27 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersFuel TypeNotes
2017Mercedes-BenzGLS350d4Matic——DIESELOpening Temperature: 92°C - with Seal
2016Mercedes-BenzGLE350d4Matic———Opening Temperature: 92°C - with Seal
2015Mercedes-BenzML350Bluetec 4Matic———Opening Temperature: 92°C - with Seal
2014Mercedes-BenzML350Bluetec 4Matic———Opening Temperature: 92°C - with Seal
2013Mercedes-BenzE350—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2013Mercedes-BenzML350Bluetec 4Matic———Opening Temperature: 92°C - with Seal
2013Mercedes-BenzR350Bluetec 4Matic3.0LV6DIESELOpening Temperature: 92°C - with Seal
2013Mercedes-BenzS350Bluetec 4Matic——DIESELOpening Temperature: 92°C - with Seal
2012Mercedes-BenzE350—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2012Mercedes-BenzGL350—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2012Mercedes-BenzML350Bluetec 4Matic———Opening Temperature: 92°C - with Seal
2012Mercedes-BenzR350Bluetec 4Matic3.0LV6DIESELOpening Temperature: 92°C - with Seal
2012Mercedes-BenzS350Bluetec 4Matic——DIESELOpening Temperature: 92°C - with Seal
2011Mercedes-BenzE350—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2011Mercedes-BenzGL350—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2011Mercedes-BenzML350Bluetec 4Matic———Opening Temperature: 92°C - with Seal
2011Mercedes-BenzR350Bluetec 4Matic3.0LV6DIESELOpening Temperature: 92°C - with Seal
2010Mercedes-BenzGL350—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2010Mercedes-BenzML350Bluetec 4Matic———Opening Temperature: 92°C - with Seal
2010Mercedes-BenzR350Bluetec 4Matic3.0LV6DIESELOpening Temperature: 92°C - with Seal
2009Mercedes-BenzGL320—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2008Mercedes-BenzGL320—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2008Mercedes-BenzML320CDI3.0LV6DIESELOpening Temperature: 92°C - with Seal
2008Mercedes-BenzR320CDI———Opening Temperature: 92°C - with Seal
2007Mercedes-BenzGL320—3.0LV6DIESELOpening Temperature: 92°C - with Seal
2007Mercedes-BenzML320CDI3.0LV6DIESELOpening Temperature: 92°C - with Seal
2007Mercedes-BenzR320CDI———Opening Temperature: 92°C - with Seal
Directly replaces or cross-references 6 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Facet — 7.8929Nissens — 92837VEMO — V30-99-0201350665AA6422001915A6422002315