2007 chevy avalanche has a\c problems a\c trouble code B0158 outside ambient temperature sensor. a\c button for a\c flashes 3 times and then turns off. using snap on scanner of the in car temperature sensors are reading negative numbers (-40) etc. i have replace outside ambient temperature sensor with new, also i have 5 volts on wires to ambient outside temp sensor. i have tried new control unit no change still negative numbers on actual values for in car sensors. how to i test from here. any help would be great.

 

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