basically its either HIGH(4) or nothing, sorry kind of noob here but where can i find the fan housing3Q Jay wrote:how does a fan change speeds?at 'high' fan speed, there is essentially a direct connect of system voltage across the fan motor.since the system voltage should always be around 14v, there must be a voltage divider in the system to 'knock down' the system voltage in order to reduce the fan speed.
check the 'blower resistor', it is near the fan housing.