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The lights are behind the panel. The front bezel is a pop on part remove it carefully and the remove the mount screws for the panel and you can access the bulbs. Check with the parts store for the replacement size.
Look to see if there is an unmarked access panel near the top of the radiator fan. Remove the screws and lift it up. The switch & harness connection is underneath. This is where Ford hid the fan switch in the Taurus. I may be there for the Marquis as well. Good luck.
If it is the heater fan motor, I believe on that you have to actually remove the dash to gain access. Remove the speaker grill on top and there are a few torx screws under that. Remove the side access panels, when you open the car doors you will a panel on each side, they are just held in there by pressure and small nubs on the panels, you will find more torx screws. In the glove box on the top towards the front you will find a few more torx screws, also in that area there are two 10 mm bolts that are somewhat hidden but accessible. After all the bolts and screws are removed you can pull the dash cover off, becareful because on the passenger side, the airbag has a paper type cover on it, you don't want to damage that. From there you should be able to gain access to the heater blower on the passenger side of the vehicle. Good luck.
the ground cable from the negative battery terminal by loosening the
retaining bolt and pulling the clamp off the terminal.
Locate the heater motor access panel. It will be a flat piece of black plastic underneath the dash on the passenger side of the Caravan, just behind the glove box. Use a socket to remove the five screws that secure the access panel to the dash.
Disconnect the plastic electrical connector from the heater
motor by prying the retaining tab away from the connector with a
flat-head screwdriver and pulling the connector off the motor.
Use a socket to remove the four screws that secure the heater
motor to the dash. Pull out the heater motor and fan blades as an
Remove the nut in the center of the fan blades that secure the fan blades to the motor's shaft.
It sounds like the fan control switch is faulty or that the connector on the rear of the switch is not making proper contact. It may also be the blower resistor but when any of the the resistors fail, you usually can still get high speed to operate. T o access the switch you will have to remove part of the dash front panel so that you can get to the rear of the switch to check the connector and remove / replace switch which is usually a snap in setup..
You could also check the resistor block for proper connection. The Blower Fan Resistor Block is usually located in the air ducting adjacent to the Blower Fan. The Resistor Block consists of 3 or 4 coils of special resistance wire attached to terminals which connect to the wiring that comes from the fan switch and then to the Blower Fan. The block is on the output side of the fan unit so that the airflow from the fan past the coils inside the duct assists in preventing them from overheating and burning out. As you already have replaced the fan motor you will know where to look for the resistor block. To replace, remove the multi-pin connector and then undo the screws holding in the block. Check air duct for leaves and dirt which may have caused the coils to fail. Replacement is the reverse procedure
You will have to remove much of the panels and dashboard to fix it. do not pry anything hard. Gently try to coax it off. But first check for screws or clips. Starting from the place closest to the switch look for access through under the dash first. if that does not work, then you will have to remove some parts.