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2005 Chevrolet Avalanche 2500 Questions

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Using zerostart heater
My "4WD NEEDS SERVICING" warning message has been on for about 2 months. I checked/added 4WD fluid to both transfer cases. This morning, my "4WD LO" light was illuminated and I had no success shifting out of 4LO following manual instructions. 4LO light is still illuminated. Any suggestions?
I have an electrical problem. The ABS and brake warning light stays on and my ignition key will not turn the engine off. The key is locked in the ignition and will not release.
The AC blows hot air on the driver side and cool on the passenger and when the heat is on it blows cold air on the driver side and hot air on the passenger side. It dose this off on on.
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