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Check for power at the fan resistor wire to the resistor, if power. change the resistor block itself. it controls fan speeds. Most resistors are beside the blower fan, below glove box. You may have to remove a panel to get to the fan resistor. check all fuses first! Even under hood fuse box.
The radio fuse is in the fuse compartment located on the passenger side of the console. Remove the cover on the console and then remove the fuse box cover, search out the radio fuse and inspect to see if it has blown.
There are actually two or three. First open the driver's door and look at the part of the dash that faces the door. That is your primary fuse panel. You just have to remove the plastic cover. It has a finger hole in it to push it towards the front of the vehicle and pull out on it. Look in the same location on the passenger side for the secondary ( if equipped ).The third location is under the hood. It will be located directly behind the battery. It has a plastic cover with about two or three snaps on it. Most of those fuses pertain to the vehicles engine and high amperage devices. There is also a primary fuse for the other fuse boxes. You will also find the majority of your relays inside of there.
look under the car's hood , and on the drivers side should be 1 - 2 box's, with plastic covers. remove the cover, or on some of them, you might have to take a screwdriver to remove any screws or snaps that might be holding the cover on, inside is relays and fuses, on the inside of the box's cover shows what the relays and fuses are for.
There is a tag to the right side of the fuse box behind the emergency brake lever. You will have to remove the plastic cover by sliding the latch back first. I just purchased a 2007 MKX and had the same issue. The 5 digit code was there and worked perfectly.
Your blower speed resistor has gone bad and needs to be replaced. You can pick one up at Auto Zone or Parts Source with the step by step instructions to getting the resistor replaced with common tools.
It is located under the glove box, way in the back of the passenger
foot area. You'll need to remove 2 screws with a 7mm socket, and remove
the plastic cover that covers the blower motor and another component
box that I think controls the passenger airbag. After removing the
plastic cover you'll need to side that passenger airbag module to the
right so it pop off its mounting bracket and move it out of the way.
That will give a better view of the blower motor. I highly recommend you
also remove the blower motor itself because the Blower Motor Resistor
is located behind it. I think you'll need a 5mm or 5.5mm socket to
remove the 3 screws that hold in place the blower motor and 2 more
screws for the Blower Motor Resistor... It's a cramped location to work
in but if you have all the tools and enough lighting then it shouldn't
take more than 30-60 minutes to do. The Blower Motor Resistor costs
about $19-$25. Good luck
There are 2 fuse panels in car, 1 under hood and the second under drivers side of dash, above hood release area. Radio fuse should be under dash, most likely a blue(15amp) fuse. The fuse panel glossery should be on inside cover of fuse panel or in owners manual under fuses in glossery.