Well i got my car back yesterday after a new expansion tank and cap, i drove about 100 miles checking the coolant level everytime i stopped and started, everything seemed fine until this evening i went out, checked the coolant level before i left (it was cold on the coolmark of tank ) i did 20miles stopped for about 20mins checked it again before i drove off (everything fine ) then after 1 mile the coolant warning light came back on . i pulled up checked the level and it was 1 to 2 inches below the cool level mark . i waited for a mo not touching the cap just to see if the light would cancel its self, it did , but after 300 yards it came back on , ( i did this twice ) so i pulled up waited for the engine to cool for 15 mins , slowly started to unscrew the expansion tank cap, just enought to release a bit of pressure, in hope the level would rise slightly, (it did ) so i screwed the cap back on and set off again back home .
I drove half a mile and the coolant warning light came back on, so i pulled up again to check the level but this time the tank was empty (arghhh)
I unscrewed the cap straight away and it didnt have any pressure at all, it took just over two litres of water until it stopped drinking what i was putting in. So i set off for about 10 miles until i got home , everything was fine on the way back, the light stayed off , and the pink coolant mixed in with the water on the way back and to my supprise the coolant was still at the right level . Back to vauxhall in the morning for the thing, i dont know what other tests they can do to tell me what i already suspected (head gasket) ill just have to wait to see what they say.
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