Bottom blower dose not go on

Is there another little piece of equipment like a little fan or something connected to the red and blue wires at the wiring block? If that sits down at the bottom of the unit, that could get wet and corroded over time and short out the red and blue wires at the block where your red and blue wires go to the condensor fan motor. Unplug them and find out if a short is blowing your thermal fuse in the condensor fan motor. You can completely isolate the condensor fan motor by unplugging all of the other wires from the wiring block except the input power wires. The red one comes from the power control board relay. The blue one, is just the white wire from the power cord unswitched. The condensor will not run while you do this test, but it doesn't matter. You want to see the condensor fan motor run and run for awhile without blowing the fuse. The ambient room temperature sensor will never trip the circuit since you aren't cooling anything. Oh, that reminds me, when you do this, turn the thermostat all of the way down to force the temperature sensor to trip to close main relay on the power control board. Listen for the audible click of the relay and the fan should turn on. This may happen immediately or it might take up to 3 minutes just after you plug in the unit. So, if your thermal fuse still blows under these conditions, you have a short in the motor winding and its time for a new motor. If all goes well and things go wrong when you reconnect that other little fan, just don't plug that other unit in again until you can replace it with a unit that isn't corroded. If all goes well, but the problem only return when the compressor is added back into the circuit, there is probably a short in the compressor or the wires leading to it has a partial short ( some resistance) Check for wires that have been rubbing on something and have worn away or been pinched. Good luck. I would love to hear if this turns out to be complicated or simple.

You should have two wires that go to a capacitor for turning the motor the right way durring start up then you should have two wires for run current. Now my motor has red and blue as the run voltage and blue and a white wire to the capacitor -6uf+/-10-5%@250AC. This cap is mounted on your fan shroud and refer to you top motor wire configuration, as both blower motors is in like the same wire colors to cap. Now my lower motor keeps blowing the thermal fuse and dose not overheat as the thermal needs at least 360 degrees of heat to blow yet my moter when running is not that hot.... I would replace the motor and cant seem to find one where did you find yours.