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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1650 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> Air Temperature Malfunction >> Diagnostic Aids

Diagnostic Aids

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.
Condition Display
Using Scan Tool Special Function Updates temperature display instantly
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
Vehicle speed above 72 km/h (45 mph) Displays actual outside temperature
Sensor ambient temperature reading is less than the last displayed value Displays actual outside temperature
When the ambient air decreases Updates temperature display rapidly