The air temp sensor measures the temp of the incoming air. cold air carries more oxygen while hot air carries less. so according to the temp from the temp sensor the cars computer can accurately adjust the the amount of fuel to be mixed with the air into the engine.
Note: there are other sensors that the computer uses to get the right air/fuel mixture.
intake air temp sensor
Didn't have an air temp sensor in 92. Came out in 93.
The air temperature sensor in built into the Mass Air Flow sensor.
exterior air temp sensor is in L.h mirror. it pops out of a little hole in the bottom.
the intake air temp sensor for an 07 Silverado is built into the MAF sensor. The MAF is located on the air intake hose.
Raise the hood, find the air cleaner, follow it to the throttle body. Somewhere in this plumbing there will be the air temp sensor.
Which temp? Oil, Water or Outside air?
Where is the IAT sensor in a peugeot 207
Intake air temp sensor.
The intake air temp sensor is located at the back of the intake manifold(air horn)
Ambient air temp sensor
There are two, the ambient air temp sensor on the cold air intake just before the filter. And the Intake temp sensor on the intake itself (throttle body after the MAF.)