Troubleshooting the Climate Control System
[AW, KJ] This procedure comes from the factory shop manual, and puts the air
conditioning into a self-test mode where it tells you if any sensors or actuators are
broken:
 | Turn the ignition ON. |
| Turn the Fan switch to Auto (all the way counter-clockwise). |
| Set Temp to 18C or 64F and wait one minute or more (all the way counter-clockwise) |
| Set Temp to 32C of 90F and wait one minute or more (all the way clockwise) |
| Push ON/OFF and AUTO at the same time |
| And indicator being ON at this time indicates a problem. Read any problems in the LEDs
as follows:
|
| Mode |
Open or shorted in-car temp sensor |
| Mode, Defrost Symbol |
Open or shorted ambient temp sensor |
| Mode, Horizontal Arrow |
Open or shorted sunlight sensor |
| Mode, Down Arrow |
Open or shorted coolant temperature sensor |
| Mode, Human Figure |
Open or shorted evaporator temperature sensor |
| A/C |
Open or shorted air mix control motor or stuck air mix door |
| A/C, On |
Open position signal circuit for mode control motor or mode door stuck |
| A/C, Off |
Open position signal circuit for re-circulate control motor |
| LED on Defrost button |
Open or shorted circuit for vent control motor or stuck vent control door |
Functional check (if you don't know exactly what's working or not):
| Set Fan to Auto. |
| Push and hold both MODE and AUTO while you start the engine
|
The unit will cycle through the following stages, one stage each 5 seconds:
| Temperature shown |
| Fan: off low med high max max high med low off |
| Air mix door: open open mid mid closed closed mid mid open open |
| Mode shown: defrst defrst floor horiz+ horiz horiz floor defrst defrst defrst floor
+floor +floor |
| Air source: fresh fresh recirc recirc recirc recirc fresh fresh fresh fresh |
| A/C: off on on on on on off off off off |
This will tell you if the doors and mode switches are working OK.
|
