Taurus V6-182 3.0L DOHC SHO (1992)
Air Door Actuator / Motor: All Technical Service Bulletins
EATC Blend Door - Intermittenly Goes to Full Heat
Article No.
92-24-7
11/18/92
HEATER - ELECTRONIC TEMPERATURE CONTROL - BLEND DOOR WILL INTERMITTENTLY GO TO FULL HEAT POSITION
FORD:
1988-92 TAURUS
LINCOLN-MERCURY:
1988-92 CONTINENTAL, SABLE
ISSUE:
Electronic Temperature Control blend door may intermittently go to full "heat on" position and remain there until the ignition switch is turned off. The
combination of an intermittently open circuit 243 (LG-0) to the blend door coupled with the software routine for the system will lock the blend door in
full heat, even if the circuit is closed again the blend door still stays in the full heat position.
ACTION:
Use the following diagnostic procedure to determine if it is necessary to install an actuator and blend door actuator jumper harness.
NOTE:
WHEN THE IGNITION KEY IS CYCLED, THE SYSTEM WILL OPERATE NORMALLY UNTIL IT RECEIVES ANOTHER INTERMITTENT
OPEN CIRCUIT SIGNAL, THEN THE PROBLEM OCCURS WHEN THE INTERMITTENT IS OPEN LONG ENOUGH TO DRIVE THE BLEND
DOOR PAST A CERTAIN FEEDBACK POSITION.
SERVICE PROCEDURE
When the intermittent "heat on" occurs and can be corrected by turning the ignition switch "off" and then "on", check circuit 243 (LG-0) for an open
circuit between the control head and actuator. Refer to the applicable Service Manual, EVTM and the following procedure for service details.
1.
Check for cut or damaged wires in circuit 243.
2.
Check for broken or loose wires at connectors in the circuit.
3.
Check that connectors are properly and solidly connected.
4.
Check pin # 15 at Control Head for continuity.
5.
Check pin # 4 at Actuator for continuity.
6.
If any of the above conditions in steps 1 through 5 are at fault, replace the blend door actuator jumper harness (FODZ-19D887-A).
7.
If no fault can be found in step 1 through 5, then replace both the actuator (FODZ-19E616-A) and blend door actuator jumper harness
(FODZ-19D887-A).
Part Number/Name Chart
OTHER APPLICABLE ARTICLES:
NONE
WARRANTY STATUS:
Eligible Under Bumper To Bumper Warranty Coverage For 1991 Model Lincolns And All 1992 Models, Basic Warranty Coverage For. All Other
Model Years
OPERATION DESCRIPTION
TIME
922407A
Check EATC System
0.5 Hr.
922407B
Check EATC System And
1.2 Hrs.