Ambient Air Temperature Sensor
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The ambient air temperature sensor mounts underhood and can be affected by city traffic, by idling, and by restarting a hot engine. Therefore, the HVAC control module filters the value of the ambient air temperature sensor for temperature display. The ambient air temperature value is updated under the following conditions:
| Condition | Display |
|---|---|
| When the HVAC module A/C and RECIRCULATION buttons are pressed simultaneously | Updates temperature display instantly |
| At start up with the engine off less than 2 hours | Displays last stored temperature unless temperature has decreased. The outside air temperature reading is always instantly updated if ambient air temperature has decreased. |
| At start up with the engine off more than 2 hours | Displays actual outside temperature |
| Vehicle speed above 32 km/h (20 mph) for a minimum of 80 seconds | Updates temperature display at a slow filtered rate |
| Sensor ambient temperature reading is less than the last displayed value | Displays actual outside temperature |
| When the ambient air decreases | Updates temperature display rapidly |