I recently bought a 4/4 with the cross flow 1600 engine at Barons and as part of a general check over took out the thermostat, flushed the radiator and heater matrixes and then tried to back flush the engine and even with 3 bar of pressure nothing moved in either direction. Heater circuit was looped through. The water pump pulley moves easily so at a bit of a loss.
Anyone have any thoughts? It has been sitting for 20 odd years so I was expecting to to be a bit silted up.
