On the 90+ models you can get certain information from the AC control panel. You press the up and down fan controls at the same time and hold them for ~5 seconds. This will display 00 on the readout. You then press the up or down fan control to cycle through the different choices. Pick one and press the center fan control to display the information.

Now the only one I know is 16. This displays the coolant temperature in centigrade. Does anyone know what the others are for? I would like to know what other information is available.

Thanks,
Jason

 

I have some diagnostic data from a Forum member that I'm sending you.

 

01 temp door motor circuit fault
02 (same)
03 ambient sensor open
04 ambient sensor short
05 in-vehicle temp sensor open
06 in-vehicle temp sensor short
07 solar load sensor open
09 low freon
10 UART failure

source: '93 GM manual

 

Found it all over at Corvetteactioncenter. Here it is for those who want to know:

HVAC Diagnostic codes

0 System Faults
(one of these will be set if your air conditioning controls have an LED flashing)
00=No Faults
01= Temp Door Motor Circuit Fault
02= Temp Door Motor Circuit Fault
03 = Ambient Sensor Open
04 = Ambient Sensor Short
05 = In-Vehicle Temp Sensor Open
06 = In-Vehicle Temp Sensor Short
07 = Solar Load Sensor Open
08 = Solar Load Sensor Short
09 = Low Freon Detected
10 = UART Failure

1- Temp Setting 60F to 90F

2- In-Car Temp Sensor 10 = HOT -130 = 230 = COLD

3- Outside Temp Sensor 10 = HOT -130 = 230 = COLD

4- Sun Load Sensor Max light Max Dark
L98 38 183
LT5 115 -110 = 210

5- Ignition System Voltage 0 = 9 Volts -155 = 255 = 16 V

6- Engine Speed (RPM divided by 25)

7- Vehicle Speed

9- A/C System Mode
00 = OFF
01 = Re-Circulation
02 = A/C
03 = Bi-Level
04 = Heater
06 = Defrost
07 = Vent
10 = Manual Re-Circulation

10- Blower PWM 0 = 0 Volts 128 = 14 Volts

11- Program Number 00 = COLD -155 = 255 = HOT

12- Mix Number -155 = 255 = COLD 00 = COLD

16- Coolant Temperature In degrees C

17- Solar Correction 114 = Max light 128 = max dark

30- Stored Full Hot Value 0 to 50

31- Temp Door Travel Range 100 to 200

34- Temp Door Position Requested 00=Full HOT -153=253=Full COLD

35- Compressor On Time 0.1 second increments

36- Number Of Times Below Critical Time

37- Software Version Number



[Modified by BiZ, 8:24 AM 10/19/2002]