Thanks for the reply well we changed the engine and the dealer at the local scrap yard has advised me the engine is a 100%, its from a 2006 peugot 206, the engine sounds good but were still having thr same problem of the boiling at the bottle, its been blead a cple of times, but i did hear water moving from behind the passanger dash , i was wondering could any pipes be blocked, had 3 mechanics look at ot and still no cure,