I have a 2002 Chevy Silverado 1500. My heats not working. It was low on antifreeze so put some in it. Now when you turn it on, blows cold air still. When i turn ac on and turn temp knob all the way to heat, the temp stays the same. That knob has always been weird. When you have it on the coldest setting, it would blow cold, but if you moved it 1/2”, it blew hot. There was no adjusting the degree of coolness.....any ideas?
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