hi had alot of problems with this 1.9tdi 110bhp a3 was over heatin had water pump and thermostat replaced and changed the radiator now it changed round and wont get hot ?shows only 60/70 on temp gauge and the rad is cold the pipe to the top of the rad is hot heater in the car blows hot but there doesent seem to be any hot water flowing through the radiator anyone else had this problem ?