hi to all
when the engine is hot put your hand on the top hose and see if there is hot water coming through also feel the heater pipes to see if they heat up i had this trouble and it was a air lock which took some time to clear also is the cooling fan coming on at that temp it should come on if you know some one with a t4 they can test the cooling fan what i would do is drain the system and refill then with the engine running and the rad cap on wait for the engine to start to warm up then open the bleed screw and see how much air comes out if tap water has been used it could have caused a blockage you should all ways use de ironized or disstilled water
david
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