The furnace should be a 3 or 4 speed motor in it. On the circuit board there are places maked heat and cool. If you are looking for low the red wire should be plugged into the heat designation. make sure unit is unplugged before changing
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Black- high speed
Red- low speed
Blue- med. high
Yellow- med. low
Usually black on "cool" terminal on board, red on "heat" terminal on board, and remaining 2 on the "park" terminals on board. White goes to the neutral terminals. Hope this helps!
The blower resistor has gone bad which is why you lost blower speeds.This may have been caused by the blower motor drawing too much power. At this point I would verify that no fuses burned out and then check the pigtail plugs going to the resistor and blower motor to make sure the connectors and connections are not melted or wiring is frayed. These connectors are located in the engine compartment on the passenger side. After checking this and if everything appears ok then the blower motor itself has probably gone bad and needs replaced. I would also replace the blower motor resistor as well. If the connectors appear damaged replace or repair as needed .
You probably cant fix it, this sounds like a multispeed blower with hi/medium/lo settings. You
can either replace the motor or connect one of the
working speeds to low/med or low/hi. or bump med to low and high to medium.
one way is to take an amp draw of the motor if you have an ampmeter otherwise
most systems will have the wires color coded black is high
blue is med high
red is med low
yellow is low
and white is nuetral
usually there is connectorson the board labeled "cool" "heat" and "park" park are the unused leads just swap wires
if there is no terminals look to see which wire is wirenutted and switch t with one of the unused ones
You are right slow for heat and fast for A/C. Here are the blower speeds black is high blue is med. and red is low if you have orange it would be med low. Look on the control board and see what color wire is connected to heat and let me know if you have something other then control board. You can take the wire that is on park and swap them around. ken