The one in the air box has nothing to do with it ! There is only one
Ambient air temp sensor
Has gray with red trace wire & lite blue with orange trace wire . What color wire's to other sensor ?
Showing - 40 , sensor is bad or return signal wire is shorting .
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on HVAC ,then HVAC controls will pop up. Click the search button then the blue link .
SOURCE: no heat
No Blower in Floor Mode
A customer arrives with a 1983 to 1995 Full Size Ford, Lincoln, or Mercury
automobile with automatic temperature control. If the complaint is no blower operation when
the floor mode is selected, the vehicle may have a problem with the thermal blower lockout
switch 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 two
wire switch has a thermal element with a small set of contacts, the contacts are open when the
coolant is below 120°F and closed when the coolant is above 120°F. The thermal blower lock
out switch also contains a vacuum switch, which applies vacuum to the outside/recirculate
valve when the system is in the floor position. When the engine coolant is below 120 degrees
and the selector is set to floor position, the thermal blower lock out prevents blower from
turning on and closes off the outside air during engine warm-up. When the coolant
temperature is above 120 degrees, and the selector is set to the floor position, the thermal
blower 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 the
engine at normal operating temperature (above 120°F). Unplug the wire harness connector
from the thermal blower lockout switch. Using a 15-amp fused wire, jumper the harness
terminals to test the switch. If the blower comes on, the thermal blower lock out switch is
faulty. If the blower doesn’t come on, look for an open between the control head selector and
thermal blower lock out switch.
In some cases the blower may continually run even when the engine temperature is
below 120 degrees. Unplug the thermal blower lock out switch and if the blower motor turns
off, the thermal blower lock out switch is faulty. If the motor continues to run, look for a
short to power between the control head selector and thermal blower lock out switch
SOURCE: cant get def. to blow warm air,floor air works good
well you are going in the right direction remove the four screws from the mode door actuator and move the door manually and see if it move freely if so move the selector switch on the dash and with the motor unbolted see if it moves properly don't forget you may need to apply a little resistance with your finger to find a problem with the actuator. good luck but both the mode door them selves and the mode door motors are vary common problem.good luck
SOURCE: 2007 mkz-cold weather whine that doesn't go away
You are still under warranty. Lincoln products have longer warranties. Make it the dealers problem. There may already be a fix in the system.
I would guess something like a speedo cable or clearance problem between moving plastic or rubber parts. If not, the fan clutch could be a possibility.
SOURCE: Where is the Cylinder Head Temp Sensor on the 2001
chilton make a great bible for your car that will help it's sold at chapters
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