Yo dont say what car it is, but you need to flush out you water system and back flush the heater radiator buy removing the 2 pipes going into the cab. they need to be taken off and using a hose pipe or pressure washer flush it out both ways. to get all the black sludge out. then re do the water system with the proper procedures .
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Yo dont say what car it is, but you need to flush out you water system and back flush the heater radiator buy removing the 2 pipes going into the cab. they need to be taken off and using a hose pipe or pressure washer flush it out both ways. to get all the black sludge out. then re do the water system with the proper procedures .