If you're moving your heater knobs and nothing is changing your cables may be bad and not sending the information along. Make sure you have everything you need to keep you warm by replacing any faulty cables.
If your heater hoses appear swollen or cracked, they may need replacement. Replace your heater hoses today and keep your car's interior nice and warm. Don't take that chance of freezing in the winter due to a cracked hose.
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