I am not sure I understand your question. When the control head is turned off, the system goes to defrost mode (failsafe by design) and the blower should be off. If the blower is at high speed when the control is in off, you have a faulty blower speed control module (power mosfet is probably shorted).
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Hey Brian ,
ICP - Integrated control panel
RCC - Remote Climate Control Module Integrated Control Panel-Electronic Automatic Temperature Control
The Taurus, Sable vehicles group together the following systems into a single integrated control panel:
AM/FM stereo radio
rear window defroster switch
electronic automatic temperature control (EATC)
full-logic cassette tape player
compact disc player control (optional)
The remote climate control module is mounted to the A/C evaporator housing behind the integrated control panel.
The integrated control panel is connected to the remote climate control module with a dedicated two-wire communication link.
The integrated control panel EATC features:
a vacuum fluorescent display (VFD) for displaying set temperature, ambient temperature, function and diagnostic trouble codes (DTCs).
electro-luminescent backlighting for all buttons and graphics.
function override buttons.
temperature control and blower speed rocker switches.
im afraid that you cant find any adapter to convert the system from auto to manual, the manual and automatic temperature control works completely different, the manual climate control controls the temperature and air distribution by vacuums lines and in the automatic climate control, controls the temperature and air distribution by a series of blend doors that works electronically
I am going to assume that you have the Automatic climate control on your car. it gives you an auto fan mode, and temperature options. Often the problem does not lie in the blower motor, but rather, the climate control module. Often, the blower motor only works on Auto fan mode, or on full out. It will often also only operate in certain modes, such as only in defrost mode, or panel. I have had several town cars and Grand Marquies of these era's and have had the same problems with 2 of these cars. The only good solution to the issue is to replace the climate control module, which is the panel with all of the switches for the heater controls. If you're really adventurous or cannot find the replacement part, it may be possible to hard wire the fan to a multi resistance switch, but you really got to know what you're doing.
Most common cause of this problem is a bad climate control power stage. The power stage control the speed of the blower fan on different settings, if it goes bad it defaults to full blast. There is a small chance the climate contro lunit itself is bad but more than 90% of the time, it is the power stage. It is located near the blower fan under the dash in the passenger footwell area. It makes it much easier to remove the glove box and knee bolster as well as the cover panel. It is rectangular in shape about 1.5" x 3" and black.
if you have manual control climate control then the system has a blower motor resistor . if you have automatic climate control then the system has a blower motor speed control. in eather case the part is under the dash in the heater box. depending on the system you have, buy the part and then look under the dash for like part, you will half to remove the under dash panels to be able to see. the part will be on the heater box somewhare.