On a 1992 town car the floor heat does not work but all other positions on climate control work?

On a 1992 town car the floor heat does not work but all other positions on climate control work?
No Blower in Floor ModeA customer arrives with a 1983 to 1995 Full Size Ford, Lincoln, or Mercuryautomobile with automatic temperature control. If the complaint is no blower operation whenthe floor mode is selected, the vehicle may have a problem with the thermal blower lockoutswitch also referred to as the CELO (cold engine lock out switch).The thermal blower lock out switch is located in the heater core intake hose. The twowire switch has a thermal element with a small set of contacts, the contacts are open when thecoolant is below 120F and closed when the coolant is above 120F. The thermal blower lockout switch also contains a vacuum switch, which applies vacuum to the outside/recirculatevalve when the system is in the floor position. When the engine coolant is below 120 degreesand the selector is set to floor position, the thermal blower lock out prevents blower fromturning on and closes off the outside air during engine warm-up. When the coolanttemperature is above 120 degrees, and the selector is set to the floor position, the thermalblower lock out switch allows the blower to operate and opens the outside air door.In order to diagnose this problem, test the thermal blower lockout switch with theengine at normal operating temperature (above 120F). Unplug the wire harness connectorfrom the thermal blower lockout switch. Using a 15-amp fused wire, jumper the harnessterminals to test the switch. If the blower comes on, the thermal blower lock out switch isfaulty. If the blower doesn't come on, look for an open between the control head selector andthermal blower lock out switch.In some cases the blower may continually run even when the engine temperature isbelow 120 degrees. Unplug the thermal blower lock out switch and if the blower motor turnsoff, the thermal blower lock out switch is faulty. If the motor continues to run, look for ashort to power between the control head selector and thermal blower lock out switch