How to carry out replacement: Thermostat 525i 24V BMW E34
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How to change engine thermostat on BMW 5 Saloon (E34) – replacement guide

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When to replace the Thermostat on your BMW 5 SERIES
Recommended replacement interval for the part category Thermostat : 50000 km
Important!
This replacement procedure can be used for:
BMW 5 Saloon (E34) 525ix 24V, BMW 5 Saloon (E34) 525i 24V, BMW 5 Saloon (E34) 520i 24V … 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 5 Saloon (E34) and other BMW models
Alternative products
How to change Thermostat on BMW E34 525i 24V – step-by-step instructions for straightforward car repair Thermostat
Tools
Replacement: engine thermostat – BMW 5 (E34). AUTODOC recommends:
All-purpose cleaning spray
Sealant
Torque wrench
Drive socket # 7
Drive socket # 10
Drive socket # 13
Ratchet wrench
Clip removal tool
Seal scraper
Flat screwdriver
Funnel
Fluid container
Fender cover
Buy tools
Replacement: engine thermostat – BMW 5 (E34). 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 5 (E34) – 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
    Remove the fasteners of the air duct housing. Use a clip removal tool.
    Step 4
    How to change Thermostat on BMW E34 1987 - free PDF and video manuals
    Remove the air distribution housing assembly.
  2. Step 5
    How to replace BMW 5 Saloon (E34) 525i 24V 1988 Thermostat - step-by-step manuals and video guides
    Unscrew the coolant reservoir cap.
  3. Step 6
    BMW E34 520i 24V 1989 Thermostat replacement: free workshop manuals
    Prepare a container for fluids.
  4. Step 7
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    Open the coolant drain tap.
  5. Step 8
    How to remove BMW 5 SERIES 525i 1991 Thermostat - online easy-to-follow instructions
    Drain the coolant from the engine.
    Replacement: engine thermostat – BMW 5 (E34). AUTODOC experts recommend:
    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.
  6. Step 9
    How to replace Thermostat on BMW 5 Saloon (E34) 1992: download PDF manuals and video instructions
    Close the coolant drain tap.
  7. Step 10
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    Loosen the clamps of the coolant hoses. Use a drive socket #7. Use a ratchet wrench.
  8. Step 11
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    Detach the coolant hose.
  9. Step 12
    Changing of Thermostat on BMW E34 1995 won't be an issue if you follow this illustrated step-by-step guide
    Loosen the coolant hose clamp. Use a drive socket #7. Use a ratchet wrench.
  10. Step 13
    BMW 5 SERIES 518i Thermostat replacement: online guides and video tutorials
    Detach the coolant hose.
  11. Step 14
    Replacing Thermostat on BMW E34 1988 525i 24V by yourself
    Detach the coolant pipe bracket. Use a drive socket #13. Use a ratchet wrench.
  12. Step 15
    5 Saloon (E34) 525i 1989 Thermostat DIY replacement workshop manual
    Unscrew the thermostat housing fasteners. Use a drive socket #10. Use a ratchet wrench.
  13. Step 16
    How to change Thermostat on BMW 5 Saloon (E34) 1990 - tips and tricks
    Clean the thermostat housing fasteners. Use all-purpose cleaning spray.
  14. Step 17
    Step-by-step recommendations for DIY replacement BMW E34 1991 525i Thermostat
    Unscrew the thermostat housing fasteners. Use a drive socket #10. Use a ratchet wrench.
  15. Step 18
    DIY replacement of Thermostat on BMW 5 Saloon (E34) 525tds 1992 is not an issue anymore with our step-by-step tutorial
    Remove the thermostat housing.
    AUTODOC recommends:
    Replacement: engine thermostat – BMW 5 (E34). To avoid damaging the part when removing it, do not use excessive force.Caution! Coolant may leak out of the coolant lines and thermostat housing.
  16. Step 19
    How to change Thermostat on BMW E34 1987 - free PDF and video manuals
    Remove the thermostat.
  17. Step 20
    How to replace BMW 5 Saloon (E34) 525i 24V 1988 Thermostat - step-by-step manuals and video guides
    Clean the thermostat housing mounting seat. Use a flat screwdriver. Use a seal scraper. Use all-purpose cleaning spray.
  18. Step 21
    BMW E34 520i 24V 1989 Thermostat replacement: free workshop manuals
    Install a new thermostat.
  19. Step 22
    Changing Thermostat on BMW 5 Saloon (E34) 535i 1990 by yourself
    Treat the thermostat housing mounting seat. Use a sealant.
  20. Step 23
    How to remove BMW 5 SERIES 525i 1991 Thermostat - online easy-to-follow instructions
    Install the new thermostat housing.
    AUTODOC recommends:
    Replacement: engine thermostat – BMW 5 (E34). Do not use excessive force during installation. This may damage the part.
  21. Step 24
    How to replace Thermostat on BMW 5 Saloon (E34) 1992: download PDF manuals and video instructions
    Tighten the thermostat housing fasteners. Use a drive socket #10. Use a torque wrench. Tighten it to 7 nm torque.
  22. Step 25
    How hard is it to do yourself: Thermostat replacement on BMW E34 540i V8 1993 - download illustrated guide
    Attach the coolant pipe bracket. Use a drive socket #13. Use a torque wrench. Tighten it to 11 nm torque.
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