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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.

The heater on my wife's 1994 Chrystler New yorker has a mind of it's own. It comes on automatically on high blower, high heat, plus the A/C does'nt work. The only way I can shut it down is by pressing the first and third buttons on the top of the control panel simultaneously, then hitting the off button. It has climate control. Is this ...