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sounds like a bad ground, even though you say you didnt remove any bolts or wires when installing the carpet, you may have bent it enough to weaken it and there could only be a few wire strands left at the connection. what i would recommend is to find the negative wire for the climate control lights, and trace it as far as you can, if it goes into the harness, just plice into the ground wire, and attach it to a solid chassis ground. with that done, if the problem persists, you know its not a ground issue. if it goes away, it may just go away on the climate controls. and if so, then youd need to redo more ground. the same can apply to the radio, id pull it out and attach a better ground and see if it continues. the radio has 3 wires that could affect it going on and off. power(batt constant) IGN(keyed on) and ground. while on, the radio can usually only be affected by loss of connection at the ground or keyed power. the batt constant mainly serves as memory when the car is off, but sometimes could affect the radio when on(some model radios) thats just what i could think of off the top of my head. other than that, it could be in the illumination wiring, that can be tested at the headlight switch and may be a problem in there as well. but start with the grounds and work your way from there.
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