How to carry out replacement: Thermostat 1.6 16V VAUXHALL ASTRA Mk IV (G) Saloon
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Change VAUXHALL ASTRA Mk IV (G) Saloon 2.0 DI Thermostat yourself – manuals and video tutorials

How to change engine thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) – replacement guide

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When to replace the Thermostat on your VAUXHALL ASTRA
Recommended replacement interval for the part category Engine thermostat : 50000 km
Important!
This replacement procedure can be used for:
VAUXHALL Astra Mk IV (G) Saloon (T98) 1.4 16V, VAUXHALL Astra Mk IV (G) Saloon (T98) 1.6 16V … 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 Astra Mk IV (G) Saloon (T98) and other VAUXHALL models
How to change Engine thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 1.6 16V – step-by-step instructions for straightforward car repair Engine thermostat
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Engine thermostat for Astra Mk4 (G) Saloon (T98) Petrol (90 hp)
Simple DIY car repair steps – Replacing Engine thermostat on Astra Mk4 (G) Saloon (T98)
Engine thermostat for Astra Mk4 (G) Saloon (T98) Petrol (101 hp)
Tools
Replacement: engine thermostat – VAUXHALL ASTRA Mk IV (G) Saloon. Tools you need:
All-purpose cleaning spray
Torque wrench
Drive socket # E8
Torx bit T20
Torx bit T30
Ratchet wrench
Clic-R collar pliers
Seal scraper
Flat Screwdriver
Funnel
Fluid container
Microfibre towel
Fender cover
Buy tools
Replacement: engine thermostat – VAUXHALL ASTRA Mk IV (G) Saloon. AUTODOC recommends:
  • Check the condition of the coolant every time you replace the thermostat. Change the coolant if necessary.
  • Please note: all work on the car – VAUXHALL ASTRA Mk IV (G) Saloon – should be done with the engine switched off.
Carry out replacement in the following order:
  1. Step 1
    Open the bonnet.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 1998 - free PDF and video manuals
    Unscrew the fasteners of the air distribution housing assembly. Use Torx T20.
  2. Step 4
    How to replace VAUXHALL Astra Mk IV (G) Saloon (T98) 1.6 16V 1999 Thermostat - step-by-step manuals and video guides
    Remove the air distribution housing assembly.
  3. Step 5
    VAUXHALL ASTRA Mk IV (G) Saloon 1.4 16V 2000 Thermostat replacement: free workshop manuals
    Unscrew the engine cover fastener. Use Torx T30. Use a ratchet wrench.
  4. Step 6
    Changing Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 1.2 16V 2001 by yourself
    Unscrew the oil filler plug.
  5. Step 7
    Remove the oil filler cap.
    Step 8
    How to remove VAUXHALL ASTRA 1.6 2002 Thermostat - online easy-to-follow instructions
    Cover the oil filler opening with a microfibre towel to prevent dirt and foreign objects from getting into the system.
  6. Step 9
    How to replace Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 2003: download PDF manuals and video instructions
    Remove the engine cover.
    AUTODOC recommends:
    Replacement: engine thermostat – VAUXHALL ASTRA Mk IV (G) Saloon. Do not use excessive force when removing the part as this may damage it.
  7. Step 10
    How hard is it to do yourself: Thermostat replacement on VAUXHALL ASTRA Mk IV (G) Saloon 2.0 16V 2004 - download illustrated guide
    Remove the microfibre towel from the oil filler opening.
  8. Step 11
    Need to know how to renew Thermostat on VAUXHALL ASTRA 2005? This free workshop manual will help you to do it yourself
    Install the oil filler cap.
  9. Step 12
    Changing of Thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 1998 won't be an issue if you follow this illustrated step-by-step guide
    Unscrew the coolant reservoir cap.
  10. Step 13
    Lift the car using a jack or place it over an inspection pit.
    Step 14
    VAUXHALL ASTRA 2.0 DI Thermostat replacement: online guides and video tutorials
    Clean the coolant drain plug. Use all-purpose cleaning spray.
  11. Step 15
    Replacing Thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 2000 1.6 16V by yourself
    Prepare a container for fluids.
  12. Step 16
    Astra Mk IV (G) Saloon (T98) 1.6 2001 Thermostat DIY replacement workshop manual
    Open the coolant drain tap. Use a flat screwdriver.
  13. Step 17
    How to change Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 2002 - tips and tricks
    Drain the coolant from the engine.
    Replacement: engine thermostat – VAUXHALL ASTRA Mk IV (G) Saloon. 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.
  14. Step 18
    Wait until the coolant has completely flowed out of the drain hole.
    Step 19
    Step-by-step recommendations for DIY replacement VAUXHALL ASTRA Mk IV (G) Saloon 2003 1.6 Thermostat
    Close the coolant drain tap. Use a flat screwdriver.
  15. Step 20
    Lower the car.
    Step 21
    DIY replacement of Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 1.7 CDTI 16V 2004 is not an issue anymore with our step-by-step tutorial
    Loosen the coolant hose clamp. Use clic-R collar pliers.
  16. Step 22
    How to change Thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 1998 - free PDF and video manuals
    Detach the coolant hose. Use a flat screwdriver.
    Replacement: engine thermostat – VAUXHALL ASTRA Mk IV (G) Saloon. Tip from AUTODOC:
    Caution! Coolant may leak out of the coolant lines and thermostat housing.
  17. Step 23
    How to replace VAUXHALL Astra Mk IV (G) Saloon (T98) 1.6 16V 1999 Thermostat - step-by-step manuals and video guides
    Loosen the coolant hose clamp. Use clic-R collar pliers.
  18. Step 24
    VAUXHALL ASTRA Mk IV (G) Saloon 1.4 16V 2000 Thermostat replacement: free workshop manuals
    Detach the coolant hose.
    Replacement: engine thermostat – VAUXHALL ASTRA Mk IV (G) Saloon. AUTODOC recommends:
    Caution! Coolant may leak out of the coolant lines and thermostat housing.
  19. Step 25
    Changing Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 1.2 16V 2001 by yourself
    Cover the open end of the coolant hose with a microfibre cloth to prevent dirt and foreign objects from entering the system.
  20. Step 26
    How to remove VAUXHALL ASTRA 1.6 2002 Thermostat - online easy-to-follow instructions
    Unscrew the thermostat housing fasteners. Use a drive socket #Е8. Use a ratchet wrench.
  21. Step 27
    How to replace Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 2003: download PDF manuals and video instructions
    Remove the thermostat housing.
  22. Step 28
    How hard is it to do yourself: Thermostat replacement on VAUXHALL ASTRA Mk IV (G) Saloon 2.0 16V 2004 - download illustrated guide
    Remove the rubber strip.
  23. Step 29
    Need to know how to renew Thermostat on VAUXHALL ASTRA 2005? This free workshop manual will help you to do it yourself
    Cover the mounting seat of the thermostat housing with a microfibre cloth to prevent dirt and foreign objects from entering the system.
  24. Step 30
    Changing of Thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 1998 won't be an issue if you follow this illustrated step-by-step guide
    Clean the mounting seats of the thermostat housing. Use a seal scraper. Use all-purpose cleaning spray.
  25. Step 31
    VAUXHALL ASTRA 2.0 DI Thermostat replacement: online guides and video tutorials
    Remove the microfibre cloth from the mounting seat of the thermostat housing.
  26. Step 32
    Replacing Thermostat on VAUXHALL ASTRA Mk IV (G) Saloon 2000 1.6 16V by yourself
    Install the rubber strip.
  27. Step 33
    Astra Mk IV (G) Saloon (T98) 1.6 2001 Thermostat DIY replacement workshop manual
    Install a new thermostat housing.
  28. Step 34
    How to change Thermostat on VAUXHALL Astra Mk IV (G) Saloon (T98) 2002 - tips and tricks
    Screw in the thermostat housing fasteners. Use a drive socket #Е8. Use a ratchet wrench.
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DIY VAUXHALL Astra Mk IV (G) Saloon (T98) Thermostat replacement - online guide
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