QuestionQUESTION: i have a 2001 jeep grand cherokee. the blower works fine in all positions,
from the floor vents to the defrost, i get no heat out of the vents, and the a/c
will not come on, i changed the thermostat. nothing, i the had radiator
replaced 4 months ago
ANSWER: do u have auto temp control in the ac display?
---------- FOLLOW-UP ----------
QUESTION: yes i have auto temp control on the ac display, and duel temp control
Answeru have broken blend air doors and the dash will need to come out and some doors will need to be replaced. do this and U should get pass and or driver range to large codes.
ENTERING THE AZC SELF-DIAGNOSTIC MODE
To enter the AZC self-diagnostic mode, perform the following:
Depress the A/C and Recirc buttons at the same time and hold. Rotate the left temperature control knob clockwise (CW) one detent.
If you continue to hold the A/C and Recirc buttons depressed, the AZC control module will perform a Segment Test of the vacuum fluorescent (VF) display. In the Segment Test you should see all of the display segments illuminate as long as both buttons are held. If a display segment fails to illuminate, the vacuum fluorescent display is faulty and the heater-A/C control must be replaced.
After viewing the Segment Test, release the A/C and Recirc buttons and the display will clear momentarily. If a 0 is displayed, then no faults are set in the system. Should there be any faults, either "current" or "historical", all fault codes will be displayed in ascending numerical sequence (note no effort is made to display fault codes in chronological order) Each fault code is displayed for one second before the next code is displayed. Once all fault codes have been displayed, the system will then repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in the CW direction or the ignition is turned "OFF".
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.
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 = Engine air intake temperature Buss message missing
12 = Country code Buss message missing
System Faults 13 = Mode motor not responding
14 = AI (Recirc) motor not responding
15 = Left temperature door not responding
16 = Right temperature door not responding
17 = Mode door travel range too small
18 = Mode door travel range too large
19 = AI (Recirc) door travel too small
20 = AI (Recirc) door travel 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 = Engine air intake temperature Buss message missing
44 = Country code Buss message missing
System Faults 45 = Mode motor was not responding
46 = AI (Recirc) motor was not responding
47 = Left temperature door was not responding
48 = Right temperature door was not responding
49 = Mode door travel range too small
50 = Mode door travel range too large
51 = AI (Recirc) door travel range too small
52 = AI (Recirc) 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
