How to carry out replacement: Thermostat E 250 D 2.5 (124.126, 124.129) Mercedes E Class W124
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Change Mercedes E Class W124 E 280 2.8 (124.029) Thermostat yourself – manuals and video tutorials

How to change temperature sensor and engine thermostat on Mercedes W124 – replacement guide

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When to replace the Thermostat on your MERCEDES-BENZ E-CLASS
Recommended replacement interval for the part category Thermostat : 50000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ E-Class Saloon (W124) E 250 D (124.126, 124.129), MERCEDES-BENZ E-Class Saloon (W124) E 200 D (124.120) … View more

The steps may slightly vary depending on the car design.

How to change temperature sensor and engine thermostat on MERCEDES W124 [TUTORIAL AUTODOC]

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Published on: 23/05/2023
12K views
All the parts you need to replace – Thermostat for E-Class Saloon (W124) and other MERCEDES-BENZ models
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Tools
Replacement: temperature sensor and engine thermostat – Mercedes W124. Tools you'll need:
Wire brush
All-purpose cleaning spray
Dielectric grease
Torque wrench
Combination spanner #10
Combination spanner #19
Drive socket # 7
Drive socket # 10
Drive socket # 22
Ratchet wrench
Flat screwdriver
Funnel
Fluid container
Fender cover
Buy tools
Replacement: temperature sensor and engine thermostat – Mercedes W124. AUTODOC experts recommend:
  • Check the condition of the coolant every time you replace the thermostat. Change the coolant if necessary.
  • All work should be done with the engine stopped.
  • All work should be done with the engine stopped.
Replacement: temperature sensor and engine thermostat – Mercedes W124. Take the following steps:
  1. Step 1
    How to change Thermostat on Mercedes E Class W124 1993 - free PDF and video manuals
    Open the bonnet.
  2. Step 2
    How to replace MERCEDES-BENZ E-Class Saloon (W124) E 250 D 2.5 (124.126, 124.129) 1994 Thermostat - step-by-step manuals and video guides
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
  3. Step 3
    Mercedes E Class W124 E 300 D 3.0 (124.131) 1995 Thermostat replacement: free workshop manuals
    Loosen the air filter hose clamps. Use a drive socket #7. Use a ratchet wrench.
  4. Step 4
    Changing Thermostat on MERCEDES-BENZ E-Class Saloon (W124) E 220 2.2 (124.022) 1996 by yourself
    Remove the air intake hose.
  5. Step 5
    How to remove MERCEDES-BENZ E-CLASS E 200 D 2.0 (124.120) 1993 Thermostat - online easy-to-follow instructions
    Cover the throttle body with a microfibre towel to prevent dust and dirt from getting into the system.
  6. Step 6
    How to replace Thermostat on MERCEDES-BENZ E-Class Saloon (W124) 1994: download PDF manuals and video instructions
    Unscrew the coolant reservoir cap.
  7. Step 7
    How hard is it to do yourself: Thermostat replacement on Mercedes E Class W124 E 250 2.5 Turbo Diesel (124.128) 1995 - download illustrated guide
    Lift the car using a jack or place it over an inspection pit.
  8. Step 8
    Need to know how to renew Thermostat on MERCEDES-BENZ E-CLASS 1996? This free workshop manual will help you to do it yourself
    Prepare a container for fluids.
  9. Step 9
    Changing of Thermostat on Mercedes E Class W124 1993 won't be an issue if you follow this illustrated step-by-step guide
    Open the coolant drain tap. Use a flat screwdriver.
  10. Step 10
    MERCEDES-BENZ E-CLASS E 280 2.8 (124.029) Thermostat replacement: online guides and video tutorials
    Drain the coolant from the engine.
    Replacement: temperature sensor and engine thermostat – Mercedes W124. Tip:
    All work should be done with the engine stopped.Wait until the coolant has completely flowed out of the drain hole.
  11. Step 11
    Replacing Thermostat on Mercedes E Class W124 1995 E 250 D 2.5 (124.126, 124.129) by yourself
    Unscrew the coolant drain plug on the engine block. Use a combination spanner #19.
  12. Step 12
    E-Class Saloon (W124) E 200 D 2.0 (124.120) 1996 Thermostat DIY replacement workshop manual
    Drain the coolant from the engine.
    AUTODOC recommends:
    All work should be done with the engine stopped.Wait until the coolant has completely flowed out of the drain hole.
  13. Step 13
    How to change Thermostat on MERCEDES-BENZ E-Class Saloon (W124) 1993 - tips and tricks
    Screw in the coolant drain plug on the engine block. Use a combination spanner #19.
  14. Step 14
    Step-by-step recommendations for DIY replacement Mercedes E Class W124 1994 E 200 D 2.0 (124.120) Thermostat
    Close the coolant drain tap. Use a flat screwdriver.
  15. Step 15
    DIY replacement of Thermostat on MERCEDES-BENZ E-Class Saloon (W124) E 200 2.0 (124.019) 1995 is not an issue anymore with our step-by-step tutorial
    Clean the thermostat housing fasteners. Use a wire brush. Use all-purpose cleaning spray.
  16. Step 16
    How to change Thermostat on Mercedes E Class W124 1993 - free PDF and video manuals
    Unscrew the thermostat housing fasteners. Use a combination spanner #10. Use a drive socket #10. Use a ratchet wrench.
  17. Step 17
    How to replace MERCEDES-BENZ E-Class Saloon (W124) E 250 D 2.5 (124.126, 124.129) 1994 Thermostat - step-by-step manuals and video guides
    Remove the fastening bolts.
  18. Step 18
    Mercedes E Class W124 E 300 D 3.0 (124.131) 1995 Thermostat replacement: free workshop manuals
    Loosen the coolant hose clamp. Use a drive socket #7. Use a ratchet wrench.
  19. Step 19
    Changing Thermostat on MERCEDES-BENZ E-Class Saloon (W124) E 220 2.2 (124.022) 1996 by yourself
    Detach the coolant hose.
    Replacement: temperature sensor and engine thermostat – Mercedes W124. AUTODOC recommends:
    Be careful! The coolant may leak.
  20. Step 20
    How to remove MERCEDES-BENZ E-CLASS E 200 D 2.0 (124.120) 1993 Thermostat - online easy-to-follow instructions
    Remove the thermostat together with the housing.
  21. Step 21
    How to replace Thermostat on MERCEDES-BENZ E-Class Saloon (W124) 1994: download PDF manuals and video instructions
    Clean the thermostat housing mounting seat. Use a wire brush. Use all-purpose cleaning spray.
  22. Step 22
    How hard is it to do yourself: Thermostat replacement on Mercedes E Class W124 E 250 2.5 Turbo Diesel (124.128) 1995 - download illustrated guide
    Remove the thermostat.
  23. Step 23
    Clean the thermostat mounting seat. Use a wire brush. Use all-purpose cleaning spray.
    Step 24
    Need to know how to renew Thermostat on MERCEDES-BENZ E-CLASS 1996? This free workshop manual will help you to do it yourself
    Install a new thermostat.
  24. Step 25
    Changing of Thermostat on Mercedes E Class W124 1993 won't be an issue if you follow this illustrated step-by-step guide
    Install the thermostat together with the housing.
  25. Step 26
    MERCEDES-BENZ E-CLASS E 280 2.8 (124.029) Thermostat replacement: online guides and video tutorials
    Install the fastening bolts.
  26. Step 27
    Replacing Thermostat on Mercedes E Class W124 1995 E 250 D 2.5 (124.126, 124.129) by yourself
    Tighten the thermostat housing fasteners. Use a drive socket #10. Use a torque wrench. Tighten it to 12 Nm torque.
  27. Step 28
    E-Class Saloon (W124) E 200 D 2.0 (124.120) 1996 Thermostat DIY replacement workshop manual
    Attach the coolant hose.
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