The Intake Air Temperature sensor (IAT) monitors the temperature of the air entering the engine. The engine computer (PCM) needs this information to estimate air density so it can balance air air/fuel mixture. Colder air is more dense than hot air, so cold air requires more fuel to maintain the same air/fuel ratio. The PCM changes the air/fuel ratio by changing the length (on time) of the injector pulses.
Fits:
2000
Chevrolet C2500 Base
Chevrolet C2500 LS
Chevrolet C3500 LS
Chevrolet C3500 Base
Chevrolet Express 2500 LS
Chevrolet Express 2500 Base
Chevrolet Express 3500 LS
Chevrolet Express 3500 Base
Chevrolet K2500 Pickup Base
Chevrolet K2500 Pickup LS
Chevrolet K3500 Pickup LS
Chevrolet K3500 Pickup Base
GMC C2500 Pickup Sierra SLT
GMC C2500 Pickup Sierra SL
GMC C2500 Pickup Sierra SLE
GMC C3500 Pickup Sierra SL
GMC C3500 Pickup Sierra SLE
GMC C3500 Pickup Sierra SLT
GMC K2500 Pickup Sierra SLT
GMC K2500 Pickup Sierra SL
GMC K2500 Pickup Sierra SLE
GMC K3500 Pickup Sierra SLE
GMC K3500 Pickup Sierra SL
GMC K3500 Pickup Sierra SLT
GMC Savana 2500 SLE
GMC Savana 2500 Base
GMC Savana 3500 Base
GMC Savana 3500 SLE

2001
Chevrolet Express 2500 Base
Chevrolet Express 2500 LS
Chevrolet Express 3500 Base
Chevrolet Express 3500 LS
GMC Savana 2500 Base
GMC Savana 3500 SLT
GMC Savana 3500 Base

2002
Chevrolet Express 2500 LS
Chevrolet Express 2500 Base
Chevrolet Express 3500 Base
Chevrolet Express 3500 LS
GMC Savana 2500 Base
GMC Savana 2500 SLT
GMC Savana 3500 SLT
GMC Savana 3500 Base