QuestionHi Kevin,
2000 Jeep GC 4.7, AZC. Dash off and new heater/AC cores 1 year ago and heat problem may have started then. Analysis: Drivers blend door operates OK, 90 degree ark, heater hose to heater core 195F, heat at floor or vent 125F, recirculate door OK. Stumped.
Rob
Answerso u have the dash out right now looking at the blend air doors?
did u perform this b4 u took the dash apart?
FAULT CODE TESTS
Fault codes are two-digit numbers that identify a circuit that is malfunctioning. There are two different kinds of fault codes.
Current Fault Codes - Current means the fault is present right now. There are two types of current faults: input faults, and system faults. If the system has a current fault when the ignition is turned "ON", or during normal operation a current fault occurs, the right side set temperature digits will display "ER" at maximum intensity, while the left side set temperature digits are blanked.
Historical Fault Codes - Historical or stored means that the fault occurred previously, but is not present right now. A majority of historical fault codes are caused by intermittent wire harness or wire harness connector problems.
CURRENT FAULT CODES
Input faults 01 = IR thermister circuit open
02 = IR thermister circuit shorted
03 = Fan pot shorted
04 = Fan pot open
05 = Mode pot shorted
06 = Mode pot open
07 = IR sensor delta too large
08 = Reserved
09 = Reserved
10 = Reserved
11 = Reserved
12 = Reserved
System Faults 13 = AI (Recirc) motor not responding
14 = Mode motor not responding
15 = Left temperature door not responding
16 = Right temperature door not responding
17 = AI (Recirc) door travel too small
18 = AI (Recirc) door travel too large
19 = Mode door travel range too small
20 = Mode door travel range too large
21 = Left temperature door travel too small
22 = Left temperature door travel too large
23 = Right temperature door travel too small
24 = Right temperature door travel too large
25 = Calibration check sum error
26 = Engine coolant temp bus message missing
27 = Vehicle speed bus message missing
28 = Engine RPM bus message missing
29 = OAT bus message missing
30 = Display intensity bus message missing
31 = VIN number bus message missing
32 = Reserved
HISTORICAL FAULT CODES
Input faults 33 = IR thermister circuit was open
34 = IR thermister circuit was shorted
35 = Fan pot was shorted
36 = Fan pot was open
37 = Mode pot was shorted
38 = Mode pot was open
39 = IR sensor delta was too large
40 = Reserved
41 = Reserved
42 = Reserved
43 = Reserved
44 = Reserved
System Faults 45 = AI (Recirc) motor was not responding
46 = Mode motor was not responding
47 = Left temperature door was not responding
48 = Right temperature door was not responding
49 = AI (Recirc) door travel was too small
50 = AI (Recirc) door travel too large
51 = Mode door travel range too small
52 = Mode door travel range too large
53 = Left temperature door travel too small
54 = Left temperature door travel too large
55 = Right temperature door travel too small
56 = Right temperature door travel too large
57 = Calibration check sum error
58 = Engine coolant temp bus message missing
59 = Vehicle speed bus message missing
60 = Engine RPM bus message missing
61 = OAT bus message missing
62 = Display intensity bus message missing
63 = VIN number bus message missing
64 = Reserved
65 = Reserved
66 = Reserved
67 = Reserved
NOTE: A battery disconnect will erase all faults stored in Random Access Memory (RAM) of the AZC control module. It is recommended that all faults be recorded before they are erased.
RETRIEVING FAULT CODES
To begin the fault code tests, depress the A/C and Recirc buttons at the same time and rotate the left temperature control knob clockwise (CW) one detent, then release the push-button.
If there are no fault codes, the "00" display value will remain in the VF window. Should there be any codes, each will be displayed for one second in ascending numerical sequence (note: no effort is made to display faults in the order they occurred) The left side set temperature display will be blanked and the right side set temperature display will indicate current and historical codes (8 historical max) presently active. Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in either direction, by pressing both the A/C and Recirc buttons at the same time, or the ignition is turned off. Record all of the fault codes, then see the Current and Historical Fault Code charts for the descriptions
