99 Sierra pickup has no heat. I flushed the heater coil and have hot water both sides. Fuse is ok. Blower and control for vents, defrost works ok. Turning the cold to hot control, temp stays the same, although it sounds like something is moving, but not certain what the noise may be. Just for info, the instrument cluster needs to be replaced, but I can't see where that could be related.
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