ok so my heater has been acting up.
sometimes it will work just fine, but now every once in a while it will spit out cold air (i think the same temp as the outside air). then after a few minutes it will become warm. (and i do wait for the engine to warm up. the temp guage is in the center when i try the heat) any ideas? its confusing the hell outta me cuz it doesnt always do it.

 

thermostat maybe. i dunno sounds like the same thing that my old silverado was doing. the heater would never warm up and replaced that and now you can roast a turkey in it.