8. Compare the Average Center Vent Temperature to the A/C performance chart for the ambient conditions at the time of testing.
If the Average Center Vent Temperature is less than the temperature in the A/C performance chart, no further diagnosis is required.
If the Average Center Vent Temperature is greater than the temperature in the A/C performance chart, refer to the Symptom Chart.
A/C Performance Chart
Symptom Chart
Humidity(%)
Temperature (°F)
68-72 73-77 78-82 83-87 88-92 93-97 98-102 103-107 108-112
5-14 — — — — —
44
45
45
45
15-24 — —
44
45
45
46
47
48
48
25-34
43
44
45
46
47
48
49
50
52
35-44
43
45
46
48
49
50
52
53
55
45-54
44
46
47
49
51
53
54
56
—
55-64
44
46
48
51
51
55
57
59
—
65-74
45
47
50
52
54
57
— — —
75-84
45
48
51
53
56
59
— — —
85-94
46
49
52
55
— — — — —
SYMPTOM CHART
Condition Possible Sources Action
No communication with the remote
climate control module—EATC
Circuit open/short.
Remote climate control module
communication network.
GO to Pinpoint Test F.
The EATC system is inoperative,
intermittent or incorrect operation
Circuit open/short.
Input sensor(s)/erratic input
signals.
Charging system.
In-car temperature sensor hose
and elbow.
GO to Pinpoint Test G.
Incorrect/erratic direction of airflow from
the outlets—manual climate control
No vacuum to the function
selector switch.
Function selector switch leaks
vacuum.
Air distribution door binding/stuck.
Vacuum line kinked/pinched.
Vacuum control motor.
A/C vacuum check valve
(19A563).
A/C vacuum reservoir tank
(19A566).
Vacuum control motor actuator
arm not connected to the door
lever.
GO to Pinpoint Test H.
Incorrect/erratic direction of airflow from
the outlets—EATC
No vacuum to the remote climate
control module.
Remote climate control module
leaks vacuum.
Air distribution door binding/stuck.
Vacuum line kinked/pinched.
Vacuum control motor.
A/C vacuum check valve
(19A563).
A/C vacuum reservoir tank
(19A566).
Vacuum control motor actuator
arm not connected to the door
lever.
GO to Pinpoint Test I.
Insufficient, erratic, or no heat—manual
climate control and EATC
Low engine coolant level.
Engine overheating.
Plugged or partially plugged
heater core.
Temperature blend door
binding/stuck.
Temperature blend door actuator
(19E616).
Temperature blend door circuit
open/shorted.
GO to Pinpoint Test J.
The A/C does not operate/does not
operate correctly
Open fuse.
A/C control relay.
Circuit open/short.
A/C cycling switch (19E561).
A/C system discharged/low
charge.
Pressure cutoff switch (19D594).
A/C control.
GO to Pinpoint Test K.
The A/C is always on
Circuit short.
A/C control.
A/C control relay.
GO to Pinpoint Test L.
No operation in all the temperature
settings—manual climate control
Open fuse.
Circuit open/short.
Temperature control switch
(19C733).
Temperature blend door actuator
(19E616).
GO to Pinpoint Test M.
2003 Taurus/Sable Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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