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
.
Page 7 of 47
2003 Taurus/Sable Workshop Manual
11/22/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/...
