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...
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Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
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.
causes of no heat in the cabin are engine thermostats that are stuck
open (engine runs cold) or air bubbles in the cooling system.
Either the entire control panel has gone out or the door actuator motor has stuck or stopped working - real pain to change - behind the glovebox - has screws on top of actuator that are almost impossible without a swivel 1/4 wrench
I have narrowed the problem to a non-functioning climate control acctuator (a mechanical vent door opening/closing unit that mixes warm and cold air) Unfortunately it is located high in the dash and requires entire removal of dash panel. Shop repair manual states a repair time of 5.2 hours... GM parts $260 actuator $75 door panel......Online parts $60 to $175
You probably have electronic climate control. Some models have this others have a vacumn operated system. If the vac system the part is about $50-100 aftermarket and easy to do yourself. If elec the part is available dealer only and about $200 last I checked. Your problem is the blend door. This is located on the pass sd under the dash. Starte your car and look under the dash in the back you will see the steel shaft rotate. The problem is GM put a plastic gear in the motor and it does not last. This is hard to get to but you can do it without taking out the whole box. 2 screws to take off then just lift off. Easier to get off than put back on. Hard to believe people buy Toyota and Nissan. This should have been a recall but, I guess if it can't kill you the U.S. is not going to do anything about it. Hope this helps. P.s. There is a small chance that it is the assembly that controls the door motor. This is your actual controls on the dash. Go get a used one from a junkyard for $40 very easy to install 20 minutes.