Measure the resistance between temperature blend door actuator C289 pin 6, circuit 436 (RD/LG) and pin 3, circuit 437 (YE/LG)
while rotating the temperature control potentiometer from full WARM to full COOL.
Does the resistance vary between 150 and 4,800 ohms?
Yes
GO to M9.
No
GO to M7.
M7 CHECK CIRCUIT 437 (YE/LG) FOR AN OPEN
Disconnect: Temperature Control Potentiometer C294c.
Measure the resistances between actuator C289 pin 3, circuit 437 (YE/LG) and temperature control potentiometer C294c pin 2,
circuit 437 (YE/LG).
Is the resistance less than 5 ohms?
Yes
GO to M8.
No
REPAIR circuit 437 (YE/LG) for an open.
TEST the system for normal operation.
M8 CHECK CIRCUITS 436 (RD/LG) AND 437 (YE/LG) FOR A SHORT TOGETHER
Measure the resistance between temperature blend door actuator C289 pin 6, circuit 436 (RD/LG) and pin 3, circuit 437
(YE/LG).
Is the resistance less than 5 ohms?
Yes
REPAIR circuits 436 (RD/LG) and 437
(YE/LG) for a short together. TEST the
system for normal operation.
No
INSTALL a new temperature control
potentiometer. REFER to Section 412-04.
TEST the system for normal operation.
M9 CHECK CIRCUITS 436 (RD/LG) AND 437 (YE/LG) FOR A SHORT TO GROUND
Disconnect: Temperature Control Potentiometer C294c.
Measure the resistances between temperature blend door actuator C289 pin 6, circuit 436 (RD/LG) and ground, and between
temperature blend door actuator C289 pin 3, circuit 437 (YE/LG) and ground.
Are the resistances less than 5 ohms?
Yes
REPAIR the affected circuit for a short to
ground. TEST the system for normal
operation.
No
GO to M10.
M10 CHECK CIRCUITS 437 (YE/LG) AND 438 (RD/WH) FOR A SHORT TO GROUND
Disconnect: Temperature Control Potentiometer C294c.
Ignition ON.
Measure the voltages between temperature blend door actuator C289 pin 4, circuit 438 (RD/WH) and ground, and between
temperature blend door actuator C289 pin 3, circuit 437 (YE/LG) and ground.
Yes
REPAIR the affected circuit for a short to
power. TEST the system for normal
operation.
No
GO to M11.
2003 Taurus/Sable Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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