On a BMW 318 what is wrong if the heater only works when driving at 3000 rpm plus and blows cool air when revs drop below?
It could be low coolant or it could be that the water pump impellers are rusted or worn through.
Eclipse 2204 heater when moving car heater works blowing hot air When stopping at light for exampleHeater blows cold air?
[first time answering questions] car heater works like the reverse of the normal cooling radiator - in fact the heater is like a small version of the rad that's on the frnt of the car - the hot water from the engine block goes into this small rad and the heater fan blows air thru it into the car - the hot heater rad loses heat into the car and - bingo - you get…
The AC and heater are completely different subsystems. The heater relies on heat generated by the engine and circulated by the engine coolant (radiator fluid) while the AC uses a belt driven compressor and separate fluids. Their only normal commonalities are the blower motor (which you said works), the ducting and the control head.
Heater blower wont work on 1996 rodeo blower motor works getting power to it but no ground cheched the heater control switch has ground coming to it but nothing else?
Need to give some more details on what you mean, exactly. A electric heater for the car, a block/oil pan heater, what, exactly? A car's heater works by hot antifreeze going through the heater core. The blower fan blows air across the heater core into the HVAC vents. Since the air being blown is colder than the heater core, the heat transfers to that air, and the heat goes through your HVAC compartment. A heater…