My Garage
Cart

Genuine Mercedes-Benz Thermostat

Engine Coolant Thermostat
  • Select Vehicle by Model
  • Select Vehicle by VIN
Select Vehicle by Model
Make
Model
Year
or
Select Vehicle by VIN
For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

53 Thermostats found

  • Mercedes-Benz Thermostat - 116-200-03-15
    Diagram for Mercedes-Benz Thermostat - 116-200-03-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 116-200-03-15
    $42.60 MSRP: $60.00
    You Save: $17.40 (29%)
    Ships in 1-2 Business Days
    ADD TO CART
    Fits the following Mercedes-Benz Models:
    • 400SE | 1992 | Base | 8 Cyl 4.2 L GAS
    • 400SEL | 1993 | Base | 8 Cyl 4.2 L GAS
    • 500SEL | 1992-1993 | Base | 8 Cyl 5.0 L GAS
    • 500SL | 1990-1993 | Base | 8 Cyl 5.0 L GAS
    • S420 | 1994-1995 | Base | 8 Cyl 4.2 L GAS
    • S500 | 1994-1995 | Base | 8 Cyl 5.0 L GAS
    • SL500 | 1994-1995 | Base | 8 Cyl 5.0 L GAS
    View More
  • Mercedes-Benz Thermostat - 271-200-00-15
    Diagram for Mercedes-Benz Thermostat - 271-200-00-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 271-200-00-15
    $26.23 MSRP: $36.00
    You Save: $9.77 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Other Name: Thermostat
    • Replaced by: 271-203-05-75
    Fits the following Mercedes-Benz Models:
    • C230 | 2003-2005 | Kompressor | 4 Cyl 1.8 L GAS
  • Mercedes-Benz Thermostat - 112-203-02-75
    Diagram for Mercedes-Benz Thermostat - 112-203-02-75
    View related parts

    Mercedes-Benz Thermostat Housing

    Part Number: 112-203-02-75
    $43.20 MSRP: $60.00
    You Save: $16.80 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Other Name: Thermostat Element; Thermostat Housing
    • Replaces: 112-200-00-15, 112-200-00-15-28
    Fits the following Mercedes-Benz Models:
    • C240 | 2001-2005 | 4Matic, Base | 6 Cyl 2.6 L GAS
    • C280 | 1998-2000 | Base | 6 Cyl 2.8 L GAS
    • C320 | 2001-2005 | 4Matic, Base | 6 Cyl 3.2 L FLEX, 6 Cyl 3.2 L GAS
    • C55 AMG | 2005 | Base | 8 Cyl 5.5 L GAS
    • CL500 | 2000-2006 | Base | 8 Cyl 5.0 L GAS
    • CL55 AMG | 2001-2006 | Base | 8 Cyl 5.5 L GAS
    • CLK320 | 1998-2005 | Base | 6 Cyl 3.2 L GAS
    • CLK430 | 1999-2003 | Base | 8 Cyl 4.3 L GAS
    • CLK500 | 2003-2006 | Base | 8 Cyl 5.0 L GAS
    • CLK55 AMG | 2001-2006 | Base | 8 Cyl 5.5 L GAS
    View More
  • Mercedes-Benz Thermostat - 601-200-00-15
    Diagram for Mercedes-Benz Thermostat - 601-200-00-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 601-200-00-15
    $34.16 MSRP: $47.00
    You Save: $12.84 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Fits the following Mercedes-Benz Models:
    • 190D | 1984-1989 | 2.2, 2.5, 2.5 Turbo | 4 Cyl 2.2 L DIESEL, 5 Cyl 2.5 L DIESEL
    • E300 | 1995-1997 | Base | 6 Cyl 3.0 L DIESEL
  • Mercedes-Benz Thermostat - 112-203-03-75
    Diagram for Mercedes-Benz Thermostat - 112-203-03-75
    View related parts

    Mercedes-Benz Thermostat Housing

    Part Number: 112-203-03-75
    $31.11 MSRP: $42.50
    You Save: $11.39 (27%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Other Name: Thermostat Element; Thermostat, Thermostat Housing
    • Replaces: 112-200-01-15
    Fits the following Mercedes-Benz Models:
    • C32 AMG | 2002-2004 | Base | 6 Cyl 3.2 L GAS
    • SLK32 AMG | 2002-2004 | Base | 6 Cyl 3.2 L GAS
  • Mercedes-Benz Thermostat - 602-200-00-15
    Diagram for Mercedes-Benz Thermostat - 602-200-00-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 602-200-00-15
    $30.50 MSRP: $42.00
    You Save: $11.50 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Fits the following Mercedes-Benz Models:
    • 300D | 1990-1993 | 2.5 | 5 Cyl 2.5 L DIESEL
    • 300SD | 1992-1993 | Base | 6 Cyl 3.4 L DIESEL
    • E300 | 1998-1999 | Base | 6 Cyl 3.0 L DIESEL
    • S350 | 1994-1995 | Base | 6 Cyl 3.4 L DIESEL
    View More
  • Mercedes-Benz Thermostat - 111-200-09-15
    Diagram for Mercedes-Benz Thermostat - 111-200-09-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 111-200-09-15
    $35.38 MSRP: $48.50
    You Save: $13.12 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Replaces: 111-200-04-15, 111-200-09-15-05
    Fits the following Mercedes-Benz Models:
    • C220 | 1994-1996 | Base | 4 Cyl 2.2 L GAS
    • C230 | 1997-2000 | Base, Kompressor | 4 Cyl 2.3 L GAS
    • SLK230 | 1998-2004 | Kompressor | 4 Cyl 2.3 L GAS
    View More
  • Mercedes-Benz Thermostat - 110-200-05-15
    Diagram for Mercedes-Benz Thermostat - 110-200-05-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 110-200-05-15
    $36.00 MSRP: $50.00
    You Save: $14.00 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Replaces: 002-203-37-75
    Fits the following Mercedes-Benz Models:
    • 190E | 1986-1993 | 2.3-16, 2.6 | 4 Cyl 2.3 L GAS, 6 Cyl 2.6 L GAS
    • 300CE | 1988-1993 | Base | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
    • 300E | 1986-1993 | 2.6, 2.8, 4Matic, Base | 6 Cyl 2.6 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
    • 300SE | 1988-1993 | Base | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
    • 300SEL | 1988-1991 | Base | 6 Cyl 3.0 L GAS
    • 300SL | 1990-1993 | Base | 6 Cyl 3.0 L GAS
    • 300TE | 1988-1993 | 4Matic, Base | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
    • C280 | 1994-1997 | Base | 6 Cyl 2.8 L GAS
    • E320 | 1994-1997 | Base | 6 Cyl 3.2 L GAS
    • S320 | 1994-1999 | LWB, SWB | 6 Cyl 3.2 L GAS
    View More
  • Mercedes-Benz Thermostat - 111-200-17-15
    Diagram for Mercedes-Benz Thermostat - 111-200-17-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 111-200-17-15
    $39.00 MSRP: $55.00
    You Save: $16.00 (30%)
    Ships in 1-2 Business Days
    ADD TO CART
    Fits the following Mercedes-Benz Models:
    • C230 | 2002 | Kompressor | 4 Cyl 2.3 L GAS
  • Mercedes-Benz Thermostat - 642-200-20-15
    Diagram for Mercedes-Benz Thermostat - 642-200-20-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 642-200-20-15
    $49.96 MSRP: $70.00
    You Save: $20.04 (29%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Other Name: Coolant Thermostat
    • Replaces: 642-200-02-15
    Fits the following Mercedes-Benz Models:
    • E350 | 2011-2013 | Bluetec | 6 Cyl 3.0 L DIESEL
    • GL320 | 2007-2009 | Bluetec 4Matic, CDI | 6 Cyl 3.0 L DIESEL
    • GL350 | 2010-2012 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
    • ML320 | 2007-2009 | Bluetec 4Matic, CDI | 6 Cyl 3.0 L DIESEL
    • ML350 | 2010-2011 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
    • R320 | 2007-2009 | Bluetec, CDI | 6 Cyl 3.0 L DIESEL
    • R350 | 2010-2012 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
    • Sprinter 2500 | 2010-2022 | Base | 6 Cyl 3.0 L DIESEL
    • Sprinter 3500 | 2010-2022 | Base | 6 Cyl 3.0 L DIESEL
    • Sprinter 3500XD | 2019-2022 | Base | 6 Cyl 3.0 L DIESEL
    View More
  • Mercedes-Benz Thermostat - 000-501-07-65
    Diagram for Mercedes-Benz Thermostat - 000-501-07-65
    View related parts

    Mercedes-Benz Temperature Sensor

    Part Number: 000-501-07-65
    $57.60 MSRP: $80.00
    You Save: $22.40 (28%)
    ADD TO CART
    Product Specifications
    • Other Name: Thermostat; Temperature Sensor
    Fits the following Mercedes-Benz Models:
    • C63 AMG | 2010-2015 | Base, Black Series | 8 Cyl 6.3 L GAS
    • CLS63 AMG | 2009-2014 | 4Matic, Base | 8 Cyl 5.5 L GAS, 8 Cyl 6.3 L GAS
    • CLS63 AMG S | 2014-2018 | 4Matic | 8 Cyl 5.5 L GAS
    • E350 | 2011-2013 | Bluetec | 6 Cyl 3.0 L DIESEL
    • GLK250 | 2013-2015 | Bluetec 4Matic | 4 Cyl 2.1 L DIESEL
    • Metris | 2016-2023 | Base | 4 Cyl 2.0 L GAS
    • SLK55 AMG | 2012-2016 | Base | 8 Cyl 5.5 L GAS
    View More
  • Mercedes-Benz Thermostat - 646-200-00-15
    Diagram for Mercedes-Benz Thermostat - 646-200-00-15
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 646-200-00-15
    $47.40 MSRP: $66.00
    You Save: $18.60 (29%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Replaced by: 646-200-11-15
    Fits the following Mercedes-Benz Models:
    • E320 | 2005-2006 | CDI | 6 Cyl 3.2 L DIESEL
  • Mercedes-Benz Thermostat - 260-200-29-00
    Diagram for Mercedes-Benz Thermostat - 260-200-29-00
    View related parts

    Mercedes-Benz Thermostat Unit

    Part Number: 260-200-29-00
    $70.80 MSRP: $99.00
    You Save: $28.20 (29%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Other Name: Thermostat; Thermostat Unit
    • Replaces: 260-200-26-00, 260-200-09-00
    Fits the following Mercedes-Benz Models:
    • A220 | 2019-2022 | 4Matic, Base | 4 Cyl 2.0 L GAS
    • A35 AMG | 2020-2021 | 4Matic | 4 Cyl 2.0 L GAS
    • CLA250 | 2020-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
    • CLA35 AMG | 2020-2023 | 4Matic | 4 Cyl 2.0 L GAS
    • GLA250 | 2021-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
    • GLA35 AMG | 2021-2023 | 4Matic | 4 Cyl 2.0 L GAS
    • GLB250 | 2020-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
    • GLB35 AMG | 2021-2023 | 4Matic | 4 Cyl 2.0 L GAS
    View More
  • Mercedes-Benz Thermostat - 113-203-02-75
    Diagram for Mercedes-Benz Thermostat - 113-203-02-75
    View related parts

    Mercedes-Benz Thermostat Housing

    Part Number: 113-203-02-75
    $129.60 MSRP: $180.00
    You Save: $50.40 (28%)
    Ships in 1-2 Business Days
    ADD TO CART
    Product Specifications
    • Other Name: Thermostat Element; Thermostat, Thermostat Housing
    • Replaces: 113-203-00-75
    Fits the following Mercedes-Benz Models:
    • CL55 AMG | 2001-2006 | Base | 8 Cyl 5.5 L GAS
    • CLS500 | 2006 | Base | 8 Cyl 5.0 L GAS
    • CLS55 AMG | 2006 | Base | 8 Cyl 5.5 L GAS
    • E55 AMG | 2004-2006 | Base | 8 Cyl 5.5 L GAS
    • G55 AMG | 2005-2011 | Base | 8 Cyl 5.5 L GAS
    • S55 AMG | 2003-2006 | Base, Kompressor | 8 Cyl 5.5 L GAS
    • SL55 AMG | 2007-2008 | Base | 8 Cyl 5.5 L GAS
    View More
  • Mercedes-Benz Thermostat - 272-200-04-15
    Diagram for Mercedes-Benz Thermostat - 272-200-04-15
    View related parts

    Mercedes-Benz Thermostat Unit

    Part Number: 272-200-04-15
    $87.60 MSRP: $122.00
    You Save: $34.40 (29%)
    ADD TO CART
    Product Specifications
    • Other Name: Coolant Thermostat; Thermostat Unit
    • Replaces: 272-200-01-15, 272-200-00-15
    Fits the following Mercedes-Benz Models:
    • C230 | 2006-2007 | Sport | 6 Cyl 2.5 L FLEX, 6 Cyl 2.5 L GAS
    • C280 | 2006-2007 | 4Matic, Luxury | 6 Cyl 3.0 L GAS
    • C300 | 2008-2012 | 4Matic Luxury, 4Matic Sport, Luxury, Sport | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
    • C350 | 2006-2011 | 4Matic, Luxury, Sport | 6 Cyl 3.5 L GAS
    • CLK350 | 2006-2009 | Base | 6 Cyl 3.5 L GAS
    • E350 | 2006-2013 | 4Matic, Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
    • E550 | 2010-2011 | 4Matic, Base | 8 Cyl 5.5 L GAS
    • GLK350 | 2010-2012 | 4Matic, Base | 6 Cyl 3.5 L GAS
    • ML350 | 2006-2011 | 4Matic, Base, Bluetec 4Matic | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.5 L GAS
    • ML450 | 2010-2011 | Hybrid 4Matic | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV)
    View More
  • Mercedes-Benz Thermostat - 164-501-02-65
    Diagram for Mercedes-Benz Thermostat - 164-501-02-65
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 164-501-02-65
    $91.20 MSRP: $127.00
    You Save: $35.80 (29%)
    ADD TO CART
    Fits the following Mercedes-Benz Models:
    • GL350 | 2013-2016 | Bluetec 4Matic | 6 Cyl 3.0 L DIESEL
    • GL450 | 2013-2016 | 4Matic, Base | 6 Cyl 3.0 L GAS, 8 Cyl 4.7 L GAS
    • GL550 | 2013-2016 | 4Matic | 8 Cyl 4.7 L GAS
    • GL63 AMG | 2013-2016 | Base | 8 Cyl 5.5 L GAS
    • GLE300d | 2016 | 4Matic | 4 Cyl 2.1 L DIESEL
    • GLE350 | 2016-2018 | 4Matic, Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
    • GLE400 | 2019, 2016-2017 | 4Matic | 6 Cyl 3.0 L GAS
    • GLE43 AMG | 2017-2019 | 4Matic | 6 Cyl 3.0 L GAS
    • GLE550e | 2016-2018 | 4Matic | 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
    • GLE63 AMG | 2016-2019 | 4Matic | 8 Cyl 5.5 L GAS
    View More
  • Mercedes-Benz Thermostat - 651-200-32-00-64
    Diagram for Mercedes-Benz Thermostat - 651-200-32-00-64
    View related parts

    Mercedes-Benz Thermostat

    Part Number: 651-200-32-00-64
    $105.60 MSRP: $147.00
    You Save: $41.40 (29%)
    ADD TO CART
    Product Specifications
    • Replaces: 651-200-16-00, 651-200-18-15, 651-200-10-15, 651-200-32-00
    Fits the following Mercedes-Benz Models:
    • E250 | 2014-2016 | Bluetec, Bluetec 4Matic | 4 Cyl 2.1 L DIESEL
    • GLE300d | 2016 | 4Matic | 4 Cyl 2.1 L DIESEL
    • GLK250 | 2013-2015 | Bluetec 4Matic | 4 Cyl 2.1 L DIESEL
    • ML250 | 2015 | Bluetec 4Matic | 4 Cyl 2.1 L DIESEL
    • Sprinter 2500 | 2014-2017 | Base | 4 Cyl 2.1 L DIESEL
    • Sprinter 3500 | 2014-2017 | Base | 4 Cyl 2.1 L DIESEL
    View More
  • Mercedes-Benz Thermostat - 169-501-01-65
    Diagram for Mercedes-Benz Thermostat - 169-501-01-65
    View related parts
    Fits the following Mercedes-Benz Models:
    • CLS55 AMG | 2006 | Base | 8 Cyl 5.5 L GAS
    • CLS550 | 2007-2011 | Base | 8 Cyl 5.5 L GAS
  • Mercedes-Benz Thermostat - 119-200-00-15
    Diagram for Mercedes-Benz Thermostat - 119-200-00-15
    View related parts
    Fits the following Mercedes-Benz Models:
    • 400E | 1992-1993 | Base | 8 Cyl 4.2 L GAS
    • 400SE | 1992 | Base | 8 Cyl 4.2 L GAS
    • 400SEL | 1993 | Base | 8 Cyl 4.2 L GAS
    • 500E | 1992-1993 | Base | 8 Cyl 5.0 L GAS
    • 500SEC | 1993 | Base | 8 Cyl 5.0 L GAS
    • 500SEL | 1992-1993 | Base | 8 Cyl 5.0 L GAS
    • CL500 | 1998-1999 | Base | 8 Cyl 5.0 L GAS
    • E420 | 1997, 1994-1995 | Base | 8 Cyl 4.2 L GAS
    • E500 | 1994 | Base | 8 Cyl 5.0 L GAS
    • S420 | 1994-1999 | Base | 8 Cyl 4.2 L GAS
    View More
  • Mercedes-Benz Thermostat - 120-200-00-15
    Diagram for Mercedes-Benz Thermostat - 120-200-00-15
    View related parts
    Product Specifications
    • Other Name: Cooling Water Thermostat; Thermostat Housing
    Fits the following Mercedes-Benz Models:
    • 600SEC | 1993 | Base | 12 Cyl 6.0 L GAS
    • 600SEL | 1992-1993 | Base | 12 Cyl 6.0 L GAS
    • 600SL | 1993 | Base | 12 Cyl 6.0 L GAS
    • CL600 | 1998-1999 | Base | 12 Cyl 6.0 L GAS
    • S600 | 1994-1999 | Base | 12 Cyl 6.0 L GAS
    • SL600 | 1994-2002 | Base | 12 Cyl 6.0 L GAS
    View More
| Page 1 of 3 |Next >
1-20 of 53 Results

Mercedes-Benz Thermostat

Mercedes-Benz Thermostat maintains a constant ideal temperature in each engine, opening up or closing off the coolant path quickly so that heat rapidly rises during start-up and never gets too hot, damaging performance and durability. For the brand, Mercedes-Benz is a German pioneer born in 1926 from the vision of Karl Benz to produce elegant passenger cars, robust trucks, and versatile buses that combine timeless design with cutting-edge technology such as the voice-controlled MBUX infotainment system and the newly announced MB.OS platform to unify driver assist capabilities, battery management, and artificial intelligence while integrating smart energy recovery in its electric and hybrid lineup to prove that luxury can walk hand in hand with sustainability and digital convenience. The star emblem means trust in the rest of the world. Owners like quiet cabins and responsive handling. This compact Thermostat is located just in front of the radiator, and via a responsive wax core, it can sense the coolant temperature and within seconds modulate the flow to allow the drive motor to heat up quickly then maintain a constant flow, which in turn ensures fuel can continue to burn efficiently, oil viscosity can maintain the correct level, and cabin heaters can work as quickly as possible during cold mornings. Once the preset point is reached, it will then adjust the passage smoothly rather than flicking abruptly; this will provide drivers with a consistent amount of power and ensure the longevity of the engine across the entire product range. Its reliable design dates back decades but is still modern.

Genuine parts are built to last. These components go through tough factory testing, so you can trust they will hold up over time. At MBPartsGiant.com, finding Mercedes-Benz Thermostat is quick and simple. We keep a massive inventory in stock with low prices that are hard to beat. Just order online to get a real manufacturer's warranty with every single part. Returns won't be a headache either, thanks to our no-hassle policy. If you are in a rush, we provide expedited shipping to get your vehicle back on the road. Don't wait. Finish your repairs today and keep your Mercedes-Benz running like new. Explore the catalog now.

Mercedes-Benz Thermostat Parts and Q&A

  • Q: How to remove, test, and refit a thermostat on Mercedes-Benz 190E?
    A:
    The thermostat is located in a housing bolted to the side of the coolant pump. Begin by disconnecting the battery negative cable and draining the cooling system. Detach the coolant hose from the thermostat cover by slackening the clip. Unscrew the securing bolts to remove the thermostat cover; if it is stuck, gently tap or rock it to free it without levering between the mating faces. Recover the seal and lift the thermostat from its housing, noting its orientation. To test the thermostat, suspend it in a container of water and heat the water to boiling; it should open by that point. For precise testing, use a thermometer to check the opening temperature against the specifications marked on the thermostat. A thermostat that fails to close completely as the water cools is also faulty. For refitting, clean the mating faces of the cover and housing, then place the thermostat back in, ensuring the spring-loaded side faces into the housing. On diesel models, align the thermostat rim's recess with the rib on the housing cover, while on petrol models, position the thermostat so the air bleed valve is at the highest point. Lay a new seal in position on the housing, fit the cover, and secure it with bolts tightened to the specified torque. Reconnect the coolant hose and refill the cooling system.
  • Q: What should you check before assuming the thermostat is responsible for a cooling system problem on Mercedes-Benz C230?
    A:
    Probably everyone knows by the time they reach adulthood that, before assuming something is wrong in a cooling system, the first step is to look at the amount of coolant in the system, the tightness of its drive-belt, or the operation of its temperature gauge or temperature light. When it takes a long time before the engine warms up, it is possible that the thermostat has become stuck open, and should be changed. When the engine is too hot to run, or overheats, the thermostat should also be extensively tested, which in turn cannot be done unless the thermostat is out of the car. When the thermostat will not close at room temperature, it is not functioning properly, and needs to be replaced; the interim economy and the emissions of driving cars and trucks without the thermostat can be detrimental. To test a thermostat, place it in a container of cold water together with a thermometer, warm the water and record the temperature at which the thermostat starts to open and when it is completely open and compare this to the specs. In case the thermostat is not opening and closing as per specifications or becomes stuck in any position it needs replacement. To replace: drain the engine coolant, take out the trim panel and coolant hose(s) in the cover of the thermostat housing, and unbolt the housing cover. Wipe down the surfaces, replace an O-ring, and reassemble everything in reverse, also refilling and bleeding the cooling system and inspecting for leaks and correct functionality. Other procedures to be followed correspond to the type of engine to be installed; e.g., before installation, hoses must be removed, all old gaskets and sealants cleaned and serpentine belt must be removed.

Related Mercedes-Benz Parts