Quote:
Originally Posted by ivandrocco
Haven't backflushed the core yet because it's been freezing. Raining now so i might try today... my coolant looks clean and new though... if the core was full of crud wouldn't my coolant look nasty too?
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No, not necessarily. The heater cores are normally made from Copper or aluminum, and as a consequence, tend to corrode differently than the steel of the block. You made not see much in the rest of the cooling system. Also, water flow is truncated away from it when it is off, therefore it is more sedimentary in the core vs the rest of the system.