Set heater matrix top open or hot or something. Disconnect the hoses from the radiator. Get a garden hose and flush both ways. So you don't actually flush the heater matrix, but the whole cooling system as the matrix is using engine heated water. Make sure to use water and coolant so your engine don't corrode or ices and cracks the engine. 50/50 coolant/water.
Morten.
Cromodora Abarth alloys. Inter Alloy lowering. Phoenix Gold audio. Abarth steering wheel. Dalmatian door and seat refurnishing
Projects: K&N induction kit, racing seats, exhaust, window tinting.