thomis

The heater core is not bad, it just keeps getting clogged. I've had the block and radiator flushed several times lately. Disconnecting the two hoses to heater core and back-flushing only works for a day or two then the heater core gets clogged. I wondered if there is something like a screen i can put inside the "to" hose to keep stuff from clogging the core?

oldchevy

Are you sure the heater core is getting completely unclogged when it is flushed? It may only be getting partially unclogged therefore it clogs back easily. When mine was clogged it was necessary to use air pressure to clean it out.

thomis

i just got the radiator cleaner. where is the radiator drain plug? can't find it. please help.

oldchevy

Remove the lower radiator hose and the coolant will run out. To flush the engine also remove the upper radiator hose and start the engine and this will get the coolant out of the engine itself. While doing this keep putting clean water into the radiator.