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High fan speed goes through a relay to power the fan.
Lower speeds go through the resistor.
You will have to check the wiring to see if there is a fault to the resistor, if you do not find one you may need a control head. You did check ALL fuses right?
Is your fan blowing on high at any other temperature or is it only the heat that is blowing on the highest setting?
If your heat is on the highest setting at all times, with no way to lower the temperature, it could be a problem with the climate control in your HVAC unit. Sometimes they fail and need to be replaced.
Now, if that isn't the problem, and your fan is blowing only on the highest setting, there's most likely a problem with your "blower motor resistor."
When they fail, they can't regulate the voltage coming from the battery, so they're using the full amount of battery voltage to power the fan, causing it to blow on high. These can be tested by a mechanic for failure, but they're relatively easy to replace without a mechanic if you're inclined to do so.
Usually located under the passenger side dash, in or under the glove compartment.
It will not correct fan speeds, you have other problems, perhaps heater core is partially blocked not allowing air to pass over fins. Look at blower motor resistors or high sped relay. good Luck.
The car normally blows air through the blower however the controls and settings of the speed of the blower are controlled by the blower motor resistor. The resistor controls the speed of the blower fan. If your blower still works on the highest setting then the blower itself is still in working order. If you are not getting any air at all, even on the highest setting, then chances are the blower has gone bad, blown fuse or open wire. If this does not help please give us more information to work with.
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