AFAIK, Scangauge comes with a display for IAT, which is the "ambient" intake air temperature, which comes from the sensor in the intake tubing. It's affected a lot by engine compartment heat. If you just want the outside air temp in front of the radiator where the automatic HVAC system and the optional compass display get its sensor reading, it may be easier to just buy a wireless thermometer from Radio Shack. I haven't ever heard of anyone snagging the data stream from the HVAC system sensor on a scangauge. Since the sensor is read by the HVAC control module, and not the PCM or BCM, it would take a more advanced than average scan tool to even get at that data because you'd be communicating to a sub-module. The kind of scan tool that could also command movement out of the HVAC actuators.