What voltages power the blower motor?

Hi @drkenrich

Is there any product information on the blower motor at all e.g. make and model number or voltage(V)/current(A) values?

Usually with DC motors the black is earth or (ground), red is power supply (in your case it may be orange) and the yellow wire (3rd wire) could either be a temp sensor lead or rpm lead.

Connect an Ohmmeter between the orange and black wires and check for a resistance reading. If you get one (don't know what value) it most probably is the motor winding.

Then connect the meter between the black and the yellow. If there's a resistance reading try using a hair dryer and warm the blower up. If the resistance value changes then it's a temp sensor. If it doesn't change or if there's no resistance measurement then try manually spinning the blower blades (if possible) and check if there's pulses seen on the meter when it spins. If there are most likely it is a hall effect sensor that indicates rpm.

Just what I'd try if you can't find any information when searching online for the make and model number of the blower.