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I have a '69 Plymouth fury with the 318 and it gets up to operating temperature without a problem and the heat blows hot but the temperature gauge only reads a quarter of the way up. Is this a gauge problem or a sending unit problem?

I have no heat coming from any of the vents, the floor or the defrost. When I move the lever to control the temperature to warm it moves itself back to the middle, but even if I hold it on warm the air that comes out is still cold or just barley warm.