I have just fitted a second hand m52 2.8 to my coupe. I started it last week to bleed the water but thought I would run some radiator flush through it. I put some water in and the radiator flush but then noticed a problem with the engine so had to turn it off. I didn't think about the radiator flush being left in there and got distracted trying to sort the running issue. It was only after a week that I was able to run it again and I have noticed that the water isn't circulating, I have just tried another water pump and radiator but when I put the water in the expansion tank and rev the engine you can see its not moving. I'm guessing there has to be a blockage in one of the water ways, also now wandering if the radiator flush being left in there has blocked it . When I took the water pump out quite a bit of water came out but when removing the top hose off the thermostat housing none came out and it only let some out when I removed the hose from the O/S of the radiator so at least I have an idea of how high the water is getting. Does anyone know if the radiator flush would have blocked the water ways or is there some thing else going on? I'm kinda thinking about putting a pressure washer up one of the water ways to the engine.