Vision V6-201 3.3L (1993)
problem with the in-car temperature sensor thermistor or vehicle wiring. Note that an in-car temperature sensor trouble code will be present. Refer
to the in-car temperature sensor diagnostics Test 9A in this manual for repair.
4. The system does not seem to cool the vehicle. This can occur if the ATC-heater unit temperature door is not properly calibrated. Start the engine
and perform the ATC-heater unit door calibration with the DRB. Also check the performance of the ATC-heater unit by performing a partial
charge check with the DRB.
5. The panel outlet temperatures seem to cycle. Use the DRB to position the temperature door at a fixed position. If the panel outlet air does not
cycle, refer to the in-car temperature sensor and ambient sensor diagnostics sections in this manual. If the outlet temperature continues to cycle
excessively, check the operation of the evaporator sensor and the A/C system expansion valve (TXV).
6. The air that leaves the ATC-heater unit does not correspond to what the LEDs indicate on the ATC display. Check to see of the ATC control has a
communications trouble code, and refer to diagnostics in this manual. If no trouble code is present, check the operation of the ATC-heater mode
door actuator linkages.
