Need help my foucus 1.8tdi w reg its had a new thermastat and water pump but there is no proper heat comin from heaters also the header water tank dosnt get hot at all and u can take cap off straight away even though its hot. pipes were taken off and hise put through and a couple of blocks heater matrix and oil cooler but were cleared and clear water running through all. heaters dis work aftwr now dont now