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You mean no air blowing out of the vents ? Blower motor maybe , blower motor relay , high speed control relay , blower motor resistor . Do you know to test automotive electrical circuits , how to read a wiring diagram so you know what circuits to test ? Doesn't matter that it was working fine , that's the nature of automotive electrical systems . Your best bet mite be to take to a repair shop. But if you care to try and fix it yourself there are videos on youtube. how to fix your blower motor in 2003 Mercury Mountaineer Ford explorer
blower is not running full speed? on high?
the blower has this resistor block on many cars,
that fail, easy. (burn up) but not ever on high. (bypassed then)
a big clue that. no?
is the blower slow or just dampers closed and cant feel it.
surly you know the sound of your blower on high, sound !
air flow is a whole other more complex matter.
also is battery rested voltage at 12.6v? if not you have discharged battery making fan weak ( power = volts times current. so....)
resistor block is located near your evaporator. remove compartment box, you can see your evaporator. around your evaporator you can see few wires bundled towards evaporator. this is your resistor block
When the blower works only on the high setting its usually a bad blower resistor which is right near the blower motor. now you say it would always blow high regardless of the fan speed setting that would indicate probably the climate control unit or a connector problem somewhere. finally it not working at all may be the climate control unit or connection went bad even further. it might have a blown fuse or a bad blower motor in addition to the climate control unit or connector problem .check for power and ground at the blower motor. the power is supplied from fuses and may have a relay also. the ground is supplied from the climate control unit and goes through the resistor to control the fan speed. good luck
try tapping the bottom of the blower motor with the blower motor speed selector turned to high and the key on. If the blower motor starts working replace it.
Another thing you can try is unplugging the blower motor and supplying your own power and ground wires to the blower motor. It doesn't matter what pin on the blower motor you supply power or ground. It will work either way. If it doesn't than replace the blower motor. If it does you might have a bad control head.
You could also have a bad blower motor relay or blower motor fuse located in the underhood fuse block. There should be power at the dark blue wire at the blower motor with the key on and the fan speed set to any position.
check to see if it's the blower motor you can do this by disconecting the wiring and run a negitive and a positive wire to it touch the wires to the connections neg to one and pos to the other doesnt matter wich side. if it works then you are most likely looking at a blower motor resistor.
Disconnect connector at blower under pass side of dash.Check for power & ground with the blower switch in the #4 speed (High).Most Likely a blower motor if all 4 speeds are out.If high works but no other speeds,you need a blower resistor.Blower easy to change 3 screws & one connector.hope this helps
these repairs are usually best left to an electromechanic but it can be doen by anyone with basic knowledge following the troubleshooting section in repair manual which can be purchase from local parts shop or online haynes or chiltons will do and get a multitester.
First check basics: are the fuses good to defrost blower? (fuse access refer to manual) then see if there is power to the blower/defrost switch use multi meter at 20V setting then see if there is power to blower unit under dash (see manual under interior section to access blower motor) probe using same setting to test for power on each wire ( as you turn blower setting from low to high you shuld notice the voltagre climbs aswell) if this checks out your blower motor is faulty replace and your good heres a few places to get the best deal on parts ebay.com Peach street autorecylcing 18003652341 www.godspeedmotorsportsonline.com