Have '92 Civic LX, 4 dr automatic with A/C. I've kept the cooling system correctly (drain/fill with Honda antifreeze- following directions on bottles). OK, the A/C needs to be recharged, but if we turn OFF the A/C button and the engine registers that it is warm (on the gauges), shouldn't there be SOME sort of heat coming from the system? I tried numerous vent settings, numerous temperature settings, outside air/recirculate, etc, but there was no heat! The car has about 130k miles on it. The heat used to work. Does the heat solely rely upon the A/C system? Thx.