The ambient temp sensor is usually located somewhere in front of the radiator or behind the front bumper. You'll see a small device, clipped to a nearby metal part of the body with wires attached.
Before replacing the sensor, try improving a possible poor connection by disconnecting and reconnecting the sensor a few times. I've experienced this on my '98 Astro, and the temp displayed correctly after cleaning up the connection.
Happy Motoring!
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