Why does a rover 200 boil over even with a new head fitted?

Answer 1

Have you bled out the cooling system? Put the heater heat control to max heat, fill the header tank with coolant then start the engine and let it run with the tank cap off till it reaches normal temp (cooling fan cuts in). Dont worry about any coolant being ejected from the header tank that's just the air bleeding out, just make sure there is always coolant in the tank topping up as nessasary. When the engine is up to temp check that there is heat at the demisters. If not bring the engine to a fast idle (1500 rpm) whilst checking for heat at the demisters. Once you have heat at the demisters return the engine to idle, top up the header tank to max mark if nessasary and replace cap. Job done.