Q: Problems with the heating in the car

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Hello. I'm having heating problems with my car. There is very little heat. If I set up the temperature on cold and the fan on high, then the vents give of a lot of air. However, the air amount from the vents lessens as I turn the temperature to hot. There is no decrease in fan. There is a sound like there is a blockage in there and the air is diverted. How can I fix this? Thanks.

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