What would be the best product to unclog a heater core on a 99 ford F150with a 4.6L V8?

Gord

New member
I don't want to have to change the heater core.I have acces to both hoses and flushed it with water,but I need something to fill the core with and let it sit.Then flush..
 
did you try backflushing it?

backflushing (running water thru it in the opposite direction of normal flow)

[HC outlet flows to water pump, so flush from water pump side to backflush!]
 
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