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I went to flush my cooling system and change the thermostat on my Mk1 Golf.

All went fine until I put the new coolant in. There is a pretty steady leak from the thermostat housing.

I've tightened the screws as much as I feel safe doing, but it wont stop.

What surprised me when I was removing the old thermostat was that there was no gasket or seal around where thermostat housing attaches - only an O-ring on the thermostat its self.

Would anyone know that I can do or if I've done something wrong?

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Found out this actually requires another O-ring, not a gasket. Another O-ring came with new the thermostat and I was able to use that.

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  • Good deal! Don't forget to select this as your answer when the time comes!
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Oct 18, 2014 at 12:35

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