No Heat!!

Hey!....Been having a problem getting hot air out of the vents lately. If you turn the HVAC mode selector to "off" (knob all the way counter-clockwise), with the temp selector on hot (knob all the way clockwise), wait for the engine to warm up, and then turn the vent on you can feel hot air for a few seconds and then turns cold. Almost like the A/C is stuck on but takes a few seconds.....I went under the hood and disconnected the only electrical connector I saw running to the A/C (have no idea what the wires do) and the problem didn't go away......any thoughts?

try flushing the heater core.

Make sure your radiator coolant level is full. Engine cooling system as priority over heater core. If your level is low heater core will be starved for hot water, starving you for heat.