Sensing Bulb

I have a 2009 Tacoma foreruner and found a sensing bulb in front of the radiator. Is this for the AC or is it for the out side temp gauge? I do not have the trd so there is no compass and out side temp display on my truck
Thanks in advance

 

Wtf is a Tacima forerunner?

 

Wtf is a Tacoma forerunner?

iPhone

 

Can you post a pic? Would make identifying much easier.

 

That is the outside air temp sensor, which is used for the A/C on 2009+ trucks, as well as the overhead display if you have it. On 2005-2008 it is for the overhead display only, and the sensor won't be there if you don't have that option.

 

I'm gonna take a huge guess, and say that he meant to say prerunner. Either that or he was driving a tacoma, had a head on collision with a 4 runner, and wants to know why there is a funny sensor bulb in the front of his rad.

 

You might be on to something here.

 

Fighting the Flood since 2001. Go reclaimer go!

I'm gonna vote ambient temp sensor for the compass/temp gauge, much like my truck has a backup camera but no monitor in the mirror, or a satellite antenna but no satellite radio, or cruise control but (formerly) no switch to turn it on.