When you disconnect the battery, it cuts off the power supply to all the electrical components in the car, including the climate control module. When you reconnect the battery, the module gets powered on again, but it might need to perform self-tests, calibrations, or reinitializations to restore its proper functionality.
One of the things the climate control module might do is actuate the air conditioner buttons to check if they are working correctly. This could manifest as the buttons blinking or flashing for a short period. Additionally, some vehicles have a feature called "climate control memory" that stores the previously set temperature and fan speed preferences. Disconnecting the battery might clear this memory, causing the buttons to default to specific settings and blink as part of the initialization process.
In many cases, the blinking of the air conditioner buttons should stop after a short period as the climate control module completes its self-checks. If the buttons continue to blink excessively or the air conditioning system doesn't function as expected, there might be an underlying issue that requires further troubleshooting. It's recommended to consult your vehicle's owner's manual or seek advice from a qualified mechanic if the problem persists.
