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More likely it's your fan speed switch. If the resistor pack goes bad, usually fan only works on high speed, but is still turned on and off by the fan switch. If yours stays on all time with key on, and won't turn off by the fan switch, probably a bad fan switch.
The resistor will be on the heater case, mounted with two small screws, a small rectangle with a wire connector with 4 or 5 wires to it, and not far from the blower motor.
The first thing i would check is the heater blower motor for power.If the blower motor has power then pull and wiggle on the blower motor resistors pigtail or connector but make sure the heater and fan motor and the ignition switch are turn on so you can here if the motor comes on. A lot of times these blower motor resistors get hot enough to melt the connector causing it to loose its connection.
Faulty blower motor resistor or the blower motor itself is faulty.Check for power at the motor with the ignition and the fan switches turn on and if you have power and the fan motor does't come on then replace the motor.
Check your blower motor resistor connection.Turn switch and fan on then wiggle the resistor pigtail fan should turn on if not replace resistor.These get to hot and usally melt the pigtail and loose their connection.
CHECK AC AND HEATER CONTROL FUSE. IF FUSE OKAY CHECK BLOWER SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR MORE LIKELY FAULTY.IF NO POWER GOING TO BLOWER MOTOR CHECK BLOWER MOTOR FUSE ANDRELAY.
Not True. I have a 2004 S60 and a std features is that the blower motor will run from 10 minutes to an hour after the engine has been turned off, This is to dry the evaporator in the dash and avoid musty odors.
If it drains your battery dead there are possible issues; 1) a weak battery that needs replacing or 2) a faulty power stage/transistor unit ont he blower fan.
The transistor unit has power and ground and a digital signal from the control unit. When the transistor sticks, the the blower will not stop when the ignition is turned off.
If the heater blower motor resistor failed then the heater will stay on full blast to keep your window clear, for safety. If the key is turned off and the fan still blows then I suspect you have an ignition switch problem. Main power comes from the key switch to feed the heater system. The plug at the ignition switch could be melted and making contact or an internal switch problem. The switch is located on the steering column under the plastic cover.Unplubbing the switch should help diagnos the problem.
I would start at the fuse. Does the blower motor turn off when the fuse is pulled? A relay is usually used in this circuit and can sometimes "stick" allowing the blower motor to receive constant power. A quick check to see if it is a wiring problem, switch or the relay its self would be to find the blower fan relay and see if there is another one of the value you can swap with it. If the problem goes away, chances are it is the relay but I always like to take a volt/ amp reading to double check my work.