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I have a 2001 Chevrolet Monte Carlo and I have the same issue! I would say it is either the coolant temperature sensor or the thermostat! Reason why I'm not 100% sure on which one caused the problem, I did them both since they were next to each other on the motor and it took care of the problem! :) Hope this helps you!
I have a '01 Monte with 73,500 miles on it and the dash interior lights flicker along with the headlights after the security light on the dash starts flickering on and off. Sometimes the light will stay on steady but it will still have the same problems. Also sometimes too, the power door locks will lock and unlock on their own while I'm operating the vehicle. I'm not 100% sure if a fuse/relay has gone bad or if there is a short circuit or if its the BCM (Body Control Module). Any thoughts would be greatly appreciated!