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Old 12-14-2013, 12:11 AM
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IN2H2O IN2H2O is offline
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You need to flush the heater core itself. It's a mini core similar to the rad only mounted inside the heater unit under the dash. There are two hoses that run up the passenger side of the engine from the water pump area up the the heater core inlet and outlets protruding from the firewall. Disconnect both these lines and alternate running water thru each of them.

Sometimes the two lines running to/from the heater core have a plastic joint with a couple hose clamps so they are easier to pull apart and flush.

I usually run one line into a bucket and then attach a hose to the other so I can flush and catch and see what comes out of the core. Usually it's a lot of flake with a couple chunks of silicone gasket clumps.
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