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Have your battery tested or first clean the terminals and cables. Check the ground cables, not just the one on the battery but frm engine to body etc etc.
1. The headlights are working as designed. These are Daytime Running Lights (DRL) and are on during daylight, but at a lowered intensity. At night they go to full intensity.
2. It sounds like the HVAC system may have lost calibration after the battery issue. Try turning all HVAC controls off or to their full CCW positions, then disconnect the battery for about 5 - 10 minutes. Reconnect the battery and don't touch any thing for a few minutes. If this does not make your AC work again, you may have a problem with one of the blend doors or its actuator motor. BTW, there is no vacuum operating the HVAC system, it is all electric.
Replace the blower resistor that is mounted next to the blower motor on the passenger side of the vehicle.
This will restore correct blower operation and I suspect it is also back-feeding voltage resulting in your electrical issues.
Two screws hold the blower resistor into the heater case and it is very easy to replace.
Good luck
WITH A TEST LIGHT CHECK THE BLOWER RESISTOR FOR POWER ON THE YELLOW, TAN, PURPLE, AND LIGHT BLUE WIRES. THE ORANGE WIRES CONTROL THE HIGH SPEED CIRCUIT. DO THIS FOR EACH POSITION OF THE BLOWER SWITCH.
THE BROWN WIRE ON THE HVAC CONTROL CONNECTOR 1 POSITION B COMES FROM THE HVAC FUSE 20 AMP. NO POWER ON THAT WIRE WILL CAUSE THE BLOWER TO NOT FUNCTION ON THE LOWER SPEEDS.
Check the blower motor which is behind the right side of the dash, in the lower right side of the HVAC Assembly, above foot area of the passenger floor. The other thing to test is the blower motor resistor which should be next to the blower motor.
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