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Please Help! Any insight would be well apreciated. When I turn the key to the start position I hear only one loud click and a faint hum. I had the battery tested at Kragen and it showed full charge. I removed the fuse labeled starter and it apeares to be undameged, when I then tried to turn the key there was no click as I ...

I have a 2000 GMC Sierrra with a 4.3 liter V-6. My heater quit working here recently and i dont know why or how to fix it. The heater will blow out warm air sometimes but its not the temp its suppose to be. and sometimes it just blows out cold air. Can someone please help? Because Now its starting to get cold here and it sucks.