2002 Olds Bravada:
The air temperature readout on the dash always reads 50 regardless of the actual temperature. Although, one day when it was 10below, it did read -4 for a short time. Where is the sensor for that device? Easily replaced?
It does sound like a sensor problem. Not sure where the sensor its self is, but they are usually by the drivers side mirror, or underneath the windsheild valance. They need to be placed in a area where wind wont give false readings due to wind chill factors. Any dealership should be able to tell you. good luck. John...
Air
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
In
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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