The answer to 'air filter blowing cold air' is that this issue is typically caused by a problem with the HVAC system, not the air filter itself. The most common causes are a malfunctioning blower motor, a stuck or broken damper, or a problem with the thermostat or control system.
If the air filter is blowing cold air, it usually indicates that the HVAC system is not properly regulating the temperature and airflow. This could be due to a mechanical issue with the system components or a problem with the thermostat settings. In some cases, it may also be caused by a clogged or dirty air filter that is restricting airflow.