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they both share the blower fan
the fuse is marked blower.
does the blower work on high only or dead on all speeds
this is the first tests.
ask for more.
If the air blows out of all of your other vents then you have either had an actuator go bad which controls which ducts the air flows through, or the shaft that has the "flap" on it has popped loose and no longer moves which will only allow air to go to the vents that are not locked. The easiest way to find out would be to get under the dash and start at the fan and trace air flow til you find the problem.
If the fan will not run on ANY speed in your Grand Marquis, the problem is most likely NOT the control switch.
Check for power and ground at the blower motor connector. If power and ground is present, replace the blower motor. Otherwise, the problem is most likely a failed blower speed control module (VERY common). The blower motor speed controller is located in the A/C evaporator housing just below the heater hoses.
Note: It is also common for a bad blower motor to CAUSE the controller to go bad. You MAY have to replace BOTH.
Without more information, I can tell you that you have a problem with your heater core. Check coolant levels and make sure you aren't low on coolant. If that isn't an issue, make sure your heater core isn't bypassed. In Texas, I see them bypassed instead of repaired because it hardly ever gets cold here. You could also have a dirty heater core that isn't allowing the heat transfer. The only other thing it could be is an issue with the temperature blend door/actuator. If it isn't opening properly to allow the warm air from the heater core to enter the ventilation system, you won't get hot air.
if the lower fan speeds dont work but the fastest speed does the heater fan resistor block needs replacing. If the highest fan speed doesnt work leave it on there and check for power at heater blower fan, if power is on one wire and the other is an earth the blower motor fan needs replacing. Use a normal globe test light to check this. If no power on any wires to fan go back and check all fuses in car and under bonnet with same test light. If fuses are ok possible open circuit wire to fan.
The heater may not work because of a bad thermostat, low coolant, or a bad sensor at the engine. It can also be a bad resistor valve under the dash. The resistor valve is connected to a wire plug on the blower motor under the dashboard. It needs to be replaced. Th AC may need to be refilled with refrigerant or the compressor may be bad.
If the blower motor only works on the high speed it most likely needs to the blower motor resistors replaced. Sometimes when replacing the resistors the dealer recommends that the blower motor be replaced in conjunction. It's believed the blower motor burns out the resistors. The resistor pack is either in the engine bay mounted on the heater box or under the passenger side of the dash board.
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