RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 7 (2001)
Ambient Temperature Sensor / Switch HVAC: Description and Operation
Ambient air temperature is monitored by the Compass/Mini-Trip Computer module through the ambient temperature sensor. The ambient temperature
sensor is a variable resistor mounted to a bracket that is secured with a screw to the underside of the hood panel near the hood latch striker in the engine
compartment.
The ambient temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
The ambient temperature sensor is a variable resistor that operates on a five-volt reference signal sent to it by the Compass/Mini-Trip Computer module.
The resistance in the sensor changes as temperature changes, changing the return circuit voltage to the Compass/Mini-Trip Computer module. Based
upon the resistance in the sensor the Compass/Mini-Trip Computer module senses a specific voltage on the return circuit, which it is programmed to
correspond to a specific temperature.
