Mercedes-Benz C240 AC blowing warm air with reset buttons flashing, no coolant refill needed on Mercedes-Benz C240

Some Mercedes-Benz C240 owners report experiencing warm air blowing from the AC along with flashing reset buttons, indicating a potential need for a system reset. To address this issue, owners may attempt the reset procedure by pressing and holding the defrost and recirculated air buttons for about 10 seconds until the LED lights start flashing, which can reboot the entire air conditioning system. However, if the warm air persists, it could be due to low refrigerant levels, a clogged filter, or a malfunctioning component, necessitating further inspection. Importantly, in cases where the reset buttons are flashing, owners do not need to refill coolant; instead, focusing on the reset process is crucial for restoring cool air in the C240.