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Thread: How to....Replace the Thermostat

  
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    How to....Replace the Thermostat

    Tools needed.
    A set of Torx sockets
    Pipe grippers
    Silicone sealant


    Drain the coolant as per How to.....HERE

    Remove engine cover.

    Disconnect the wiring connector and small pipe attached to top the Thermostat housing.



    To disconnect the pipe you'll need to squeeze the pipe clip together and pull it off the housing, then pull the rubber piping off.

    Undo the two Torx bolts holding the thermostat housing onto the engine block.



    That should leave you with the housing with the thermostat clipped in it.

    To remove the old thermostat, push it down slightly and rotate it from its clips.

    To fit the new one, make sure the pin is engaged into it's location at the bottom of the housing and push the spring down to get the two tabs under the clips on the housing.

    To refit the housing, you need to remove the old rubber seal and make sure both seating faces are clean, dry and degreased.

    Put a small bead of silicone around the housing.

    It should look like this.


    Fit the housing onto the block and tighten the two bolts (torqued to 8 Nm on the 2.2, 20Nm for the rest)

    Reconnect the hose and connector to the housing.

    WAIT FOR THE SILICONE TOO DRY.

    Refill and bleed coolant system as per How to..... (link above)

    Note - this was done on a Z18XE, it may be slightly different on different engines, but will be the same principle.

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    aislamuk's Avatar
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    What are the signs that your temperature gauage sensor or thermostat is not working?

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    Nice how-to fella come in handy as think ines on blink


    Quote Originally Posted by aislamuk View Post
    What are the signs that your temperature gauage sensor or thermostat is not working?
    at a guess im thinking when your engine is warm but aint reading on the temp guage.
    2000, 1.6 8v, 148k miles-156k now 160k and not far off dyeing. Oh and still growing. -There may be spelling mistakes in my posts but at least you still understand it

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    fdrightup
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    you could try rtv jointing compound with the gaskets

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    Quote Originally Posted by fdrightup View Post
    you could try rtv jointing compound with the gaskets
    silicone sounds easier to me as there is always a tube lying around somwhere
    2000, 1.6 8v, 148k miles-156k now 160k and not far off dyeing. Oh and still growing. -There may be spelling mistakes in my posts but at least you still understand it

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    Great post! Really helped, before my astra (1.8 SXI) would only ever get to the centre of the temperature guage when sitting in traffic, as soon as you were driving it wold go right down to the bottom two marks, I bought a thermostat for £8 on ebay and couldn't believe how easy it was to change! I've only got basic mechanical knowledge and it took me an hour! Now the guage sits straight up at the 90 degree mark even when driving with the heat on full blast! Many thanks

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    any chance of getting the pics back up please??
    Astra H 1.8 SRi

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    wish these pics where still up

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    it aint hard mate if you look at it there is only a pipe to disconnect and you gotta drain the water from the system to replace it thats about it

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    Sadly the pics are gone...
    Astra G Coupe powered by a lazy Z18XE

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