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    Basically if you don't have good heat then you can safely assume that the heatercore or the blend door is bad. You can test the blend door with your ears. turn the knob from full hot to full cold and back and you should be able to hear the door open and shut.

    Signs of a bad heatercore is wet passenger floor. this means it is leaking. The likely cause of the gunk if the old age, low miles and dexcool coolant.

    GL!
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