Fitted a new thermastat yesterday with new oring filled it back up with water,ran it to temp on drive then took it for a 10 min drive came back and checked water level and water was leaking from where the thermastat is.took it off again cleaned it,checked housing for cracks and cant see anything.i did same thing twice.didnt leak when it was sat on drive at idle,soon as its driven and back on drive its leaking.to say im getting to the end of my patience is an under statement. :devil: :devil:

This issue came up a while ago. Iirc the housing for the stat is plastic and prone to warping. Maybe best searching rather than going by me as I might be wrong.

As far as you are sure about the o ring and you have properly cleaned the engine block side before installing, then I would change the plastic housing. I always replace it WITH the thermostat. Mine had an almost invisible crack and was leaking from there (of course only a small quantity).

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These are very cheap delivered from GSF. I bought a spare incase I broke mine replacing the thermostat, but it stayed in one piece.

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Think I've sorted it.i bought a spare oring with the thermostat,took the one off that came with the thermostat and tried the other one on and it fitted better,took it out for a test drive and it didn't leak or lose any water.if it does it again it's a new housing.thanks for the advice

Great, hope problem solved!

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