When to replace the Thermostat on your BMW 7 SERIES
Recommended replacement interval for the part category Engine thermostat : 50000 km
Important!
This replacement procedure can be used for:
BMW 7 (E38) 730 d, BMW 7 (E38) 730 d View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Thermostat for 7 (E38) and other BMW models
How to change Engine thermostat on BMW E38 740 i, iL – step-by-step instructions for straightforward car repair
Engine thermostat
How to change Thermostat Housing on BMW E38 740 i, iL – step-by-step instructions for straightforward car repair
Thermostat Housing
Tools
Replacement: engine thermostat – BMW 7 (E38). List of the tools you'll need:
All-purpose cleaning spray
Sealant
Torque wrench
Combination spanner #16
Combination spanner #24
Combination spanner #32
Drive socket # 7
Drive socket # 10
HEX bit No.H5
Ratchet wrench
Clip removal tool
Seal scraper
Flat screwdriver
Funnel
Fluid container
Crow bar
Microfibre towel
Fender cover
Replacement: engine thermostat – BMW 7 (E38). Tip from AUTODOC:
  • Check the condition of the coolant every time you replace the thermostat. Change the coolant if necessary.
  • Please note: all work on the car – BMW 7 (E38) – should be done with the engine switched off.
Carry out replacement in the following order:
  1. Step 1
    Open the hood.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Thermostat on BMW E38 1994 - free PDF and video manuals
    Unscrew the coolant reservoir cap.
  2. Step 4
    How to replace BMW 7 (E38) 740 i, iL 1995 Thermostat - step-by-step manuals and video guides
    Remove the fan shroud clips. Use a clip removal tool.
  3. Step 5
    BMW E38 728 i, iL 1996 Thermostat replacement: free workshop manuals
    Unscrew the cooling fan fastener. Use a combination spanner #32 (2 pieces).
  4. Step 6
    Changing Thermostat on BMW 7 (E38) 735 i, iL 1997 by yourself
    Remove the fan shroud. Remove the cooling fan.
  5. Step 7
    How to remove BMW 7 SERIES 730d 2.9 1998 Thermostat - online easy-to-follow instructions
    Unscrew the engine cover fastener. Use HEX No.H5. Use a ratchet wrench.
  6. Step 8
    How to replace Thermostat on BMW 7 (E38) 1999: download PDF manuals and video instructions
    Remove the engine cover.
    AUTODOC recommends:
    Replacement: engine thermostat – BMW 7 (E38). Do not use excessive force when removing the part as this may damage it.
  7. Step 9
    How hard is it to do yourself: Thermostat replacement on BMW E38 725 tds 2000 - download illustrated guide
    Prepare a container for fluids.
  8. Step 10
    Need to know how to renew Thermostat on BMW 7 SERIES 2001? This free workshop manual will help you to do it yourself
    Open the coolant drain tap.
  9. Step 11
    Changing of Thermostat on BMW E38 1994 won't be an issue if you follow this illustrated step-by-step guide
    Drain the coolant from the engine.
    Replacement: engine thermostat – BMW 7 (E38). Tip from AUTODOC experts:
    Caution! The coolant can be very hot.Wear gloves to prevent contact with hot liquid.All work should be done with the engine stopped.Wait until the coolant has completely flowed out of the drain hole.
  10. Step 12
    Close the coolant drain tap.
    Step 13
    BMW 7 SERIES 740 i, iL Thermostat replacement: online guides and video tutorials
    Unscrew the intercooler pipe clamp. Use a drive socket #7. Use a ratchet wrench.
  11. Step 14
    Replacing Thermostat on BMW E38 1996 740 i, iL by yourself
    Remove the intercooler hose.
  12. Step 15
    7 (E38) 730d 2.9 1997 Thermostat DIY replacement workshop manual
    Unscrew the fastener of the coolant hose clamp. Use a drive socket #10. Use a ratchet wrench.
  13. Step 16
    How to change Thermostat on BMW 7 (E38) 1998 - tips and tricks
    Pull aside the V belt tensioner pulley. Use a combination spanner #16.
  14. Step 17
    Step-by-step recommendations for DIY replacement BMW E38 1999 730d 2.9 Thermostat
    Remove the V belt.
    Replacement: engine thermostat – BMW 7 (E38). Professionals recommend:
    Check the condition of the tensioner pulley and idler pulley. Replace them if necessary.
  15. Step 18
    DIY replacement of Thermostat on BMW 7 (E38) 750 i, iL 2000 is not an issue anymore with our step-by-step tutorial
    Return the tensioner pulley to its initial position.
  16. Step 19
    How to change Thermostat on BMW E38 1994 - free PDF and video manuals
    Pull aside the V-ribbed belt tensioner pulley. Use a combination spanner #16.
  17. Step 20
    How to replace BMW 7 (E38) 740 i, iL 1995 Thermostat - step-by-step manuals and video guides
    Remove the V-ribbed belt.
    Replacement: engine thermostat – BMW 7 (E38). AUTODOC recommends:
    Check the condition of the tensioner pulley and idler pulley. Replace them if necessary.
  18. Step 21
    BMW E38 728 i, iL 1996 Thermostat replacement: free workshop manuals
    Return the tensioner pulley to its initial position.
  19. Step 22
    Changing Thermostat on BMW 7 (E38) 735 i, iL 1997 by yourself
    Loosen the coolant hose clamp.
  20. Step 23
    How to remove BMW 7 SERIES 730d 2.9 1998 Thermostat - online easy-to-follow instructions
    Detach the coolant hose. Use a crowbar.
  21. Step 24
    How to replace Thermostat on BMW 7 (E38) 1999: download PDF manuals and video instructions
    Loosen the coolant hose clamp.
  22. Step 25
    How hard is it to do yourself: Thermostat replacement on BMW E38 725 tds 2000 - download illustrated guide
    Detach the coolant hose. Use a crowbar.
    Replacement: engine thermostat – BMW 7 (E38). Tip from AUTODOC:
    Caution! Coolant may leak out of the coolant lines and thermostat housing.
  23. Step 26
    Need to know how to renew Thermostat on BMW 7 SERIES 2001? This free workshop manual will help you to do it yourself
    Clean the thermostat housing fasteners. Use all-purpose cleaning spray.
  24. Step 27
    Changing of Thermostat on BMW E38 1994 won't be an issue if you follow this illustrated step-by-step guide
    Unscrew the thermostat housing fasteners. Use a drive socket #10. Use a ratchet wrench.
  25. Step 28
    BMW 7 SERIES 740 i, iL Thermostat replacement: online guides and video tutorials
    Remove the thermostat housing. Use a crowbar.
    AUTODOC recommends:
    Replacement: engine thermostat – BMW 7 (E38). Do not use excessive force when removing the part as this may damage it.Caution! Coolant may leak out of the coolant lines and thermostat housing.
  26. Step 29
    Replacing Thermostat on BMW E38 1996 740 i, iL by yourself
    Cover the thermostat housing with a microfibre cloth to prevent dirt and foreign objects entering the system.
  27. Step 30
    7 (E38) 730d 2.9 1997 Thermostat DIY replacement workshop manual
    Clean the thermostat housing mounting seat. Use a seal scraper. Use all-purpose cleaning spray.
  28. Step 31
    How to change Thermostat on BMW 7 (E38) 1998 - tips and tricks
    Treat the thermostat housing mounting seat. Use a sealant.
  29. Step 32
    Remove the microfibre cloth from the thermostat housing.
    Step 33
    Step-by-step recommendations for DIY replacement BMW E38 1999 730d 2.9 Thermostat
    Install the new thermostat housing.
    AUTODOC recommends:
    Replacement: engine thermostat – BMW 7 (E38). Do not use excessive force during installation. This may damage the part.
  30. Step 34
    DIY replacement of Thermostat on BMW 7 (E38) 750 i, iL 2000 is not an issue anymore with our step-by-step tutorial
    Tighten the thermostat housing fasteners. Use a drive socket #10. Use a torque wrench. Tighten it to 7 nm torque.
  31. Step 35
    How to change Thermostat on BMW E38 1994 - free PDF and video manuals
    Attach the coolant hose.
  32. Step 36
    How to replace BMW 7 (E38) 740 i, iL 1995 Thermostat - step-by-step manuals and video guides
    Secure the coolant hose clamp.
  33. Step 37
    BMW E38 728 i, iL 1996 Thermostat replacement: free workshop manuals
    Tighten the coolant hose fastener. Use a drive socket #10. Use a torque wrench. Tighten it to 6 nm torque.
  34. Step 38
    Changing Thermostat on BMW 7 (E38) 735 i, iL 1997 by yourself
    Attach the coolant hose.
  35. Step 39
    How to remove BMW 7 SERIES 730d 2.9 1998 Thermostat - online easy-to-follow instructions
    Secure the coolant hose clamp.
  36. Step 40
    How to replace Thermostat on BMW 7 (E38) 1999: download PDF manuals and video instructions
    Clean the mounting seats of the V-ribbed belt. Use all-purpose cleaning spray.
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DIY BMW 7 (E38) Thermostat replacement - online guide
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