leaking coolant tank

andyc77

Rookie
could some one offer any advice please. I recently noticed that i am losing water in my coolant tank. Going from max to min in the space of 100 miles. Took it to the dealership who said they could find no leak, but the spark plugs were discoloured, possibley water leaking into them(so they say)???????
They then said it may be the head gasket, but would not look at it, God knows why not. The car is also getting condensated internally.It drives fine and the heaters work like normal. Its just the water going down quicker than usual. Would this, and a leak inthe coolant system mean a problem with the head gasket? Its a deawoo lacetti 54 reg which has a lpg conversion last july. This is the first problem i have not and not sure if it is anything to do with the lpg
 
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