Yes it does. When the battery uses power the alternator has to charge the battery and it becomes harder to turn when more electricity is required. When you have the fan on high it essentially makes the alternator harder to turn so it does use more gas. It may be an incremental amount but it is more.
The blower motor speed resistor is burned out.
If the blower only works on high the blower resistor is most likely the problem and should be replaced. On rare occasions if the car has blown the resistor more than once the blower motor shouuld be replaced.
The heater blower motor is under the hood bolted to the heater plenum on the passenger side of the car.
The heater blower motor itself is located under the hood on the passenger side of the car.
The car heater is a vague question. The heater core is not fused, it is like a mini radiator. The blower motor for heat/AC is fused. The selector blower motor resistor is fused in line with blower motor. Now if you lost heat, the water pump is belt driven, not fused.
it needs a new blower motor resistor ....
The most likely cause is a bad blower motor resistor.
check the blower motor resistor
Heater blower motor is defective and locked up, or possible short in the wiring.
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 core is about a $20 - $50 part. Blower motor prices can vary greatly.
if its a car, your head gasket may be blown. watch out for boiling coolant
Check the fuse and blower relay first. Make sure that there is power getting to the blower motor before changing the motor.