The blower motor resistor is bad ! The blower motor operates at different speeds an when you turn the speed switch It directs current through a different resistor making the blower motor go slower of faster . What Does Blower Motor Resistor Do eHow
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Hi John electric fan comes on high, I assume it's the engine cooling fan you are talking about and not the heater.
I would check the coolant level first, if its very low this may set fan on high speed. If level is ok it may require a thermostat housing. My advise at this point would be to have it checked by a mechanic as it will now start costing money and you do not want to fit parts that may not be required.
If it is the heater cooling fan that comes on it will require the heater rheostat checking also the wiring in case its burnt. Good luck
I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that
Your problem most likely is the resistor block. In order to limit the fan speed a reistor is placed in the circuit which will limit current flow to the motor thus giving you the diferent speeds. High speed bypasse the resistor to get full motor speed. Since you only get high speed it is very likely that the resistor block is faulty
I have had this when a gum nut or piece of leaf lands in the fan. I got luck and by removing the vents I could access the fan area. That may not happen in many cars but it is worth a shot. On the Cortina TF I cut a hole in the air chamber in the engine area and got access to the fans and the resistor block.
I'm assuming the heat for the inside of your car. Does it work at all? On any of the speed setting? If it doesn't check fuses, check for power and ground at fan. Or if you can see it just bang on it with your fist sometimes that will get it working temp.
I assume that you are talking about the heater fan?
Your heater FAN has at least 3 settings, and for our purposes we will assume low,med and high
Low and medium run through a resistor High is wired direct Either your resistor is bad or your fan is I know it seems wrong that the fan could be shot but it could be pulling so many amps that it won't work in any other mode than high I just had this happen on one of my trucks Start with the fan
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