![]() Refer to Section 11-02 of the appropriate year Thunderbird/Cougar Service Manual for additional diagnosis and repair information. On 1996 vehicles, the EVO is located under the heater blower case on the passenger side.On 1994-95 vehicles, the EVO module is located under the package tray in the trunk.Refer to the following Service Procedure for details. Replace the EVO module with a new module that has improved filtering for electrical noise. The EVO module then interprets this as an increase in vehicle speed and reduces the steering assistance to the heavier for highway level. This is due to electrical "noise" from the Vehicle Speed Sensor (VSS) being picked up by the Electronic Variable Orifice (EVO) module. Steering efforts at low speeds may intermittently increase to the heavier for highway setting on some vehicles. If automatic HVAC system i would suspect Blower motor control module. Replacing Front Suspension on a 1997 Ford Thunderbird LXUpper and lower ball joints, A arm, lower control arm, outer tie rods, struts, sway bar linkage.An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN).When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN). The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. ![]() Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
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