The car would not start right up and when it did, there was a constant clicking as if something was stuck in a fan. I tried all the knobs and turned everything off and still clicking. It is coming from somewhere behind the glovebox and it is on even if car is not running but in the on position.
Check your recirculation door actuator. It's a bad design where the computer senses high (stall) current in the servo motor to know when to stop. This stresses a plastic secondary gear in the servo and can cause a couple teeth to break off. Now the gears skip (making the clicking sound) and the motor never stalls so computer never shuts it off and the clicking continues. It's an expensive part (of course) but I fixed mine by opening it up and reversing the secondary gear so that the bad section is never encountered in the 180 degree travel. To find it, take off the glove box and it'll be on the left side under there but a bit of a pinch to get to.
The constant clicking means that the starter is not getting 12 volts. clean the battery cables at both ends.
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