Pontiac Solstice AC blows hot air and heater blows cold with thumping noise from the dashboard on Pontiac Solstice

Some Pontiac Solstice owners report experiencing issues with their air conditioning and heating system, such as the AC blowing hot air and the heater blowing cold air accompanied by a thumping noise from the dashboard. These problems may stem from several factors, including low or overcharged refrigerant, which can hinder the AC's cooling performance, and a malfunctioning compressor that affects the overall efficiency of the system. Additionally, a clogged cabin air filter can restrict airflow, while dirty condenser or evaporator coils may impair heat exchange processes. Some owners have also noted that a dirty or sluggish blower motor can lead to inconsistent temperature control, and a faulty heater blend door actuator might cause cold air to blow from the heater along with dashboard noises. To address these concerns, it is recommended to check refrigerant levels, inspect and clean HVAC components, and consider replacing the blend door actuator if necessary. If these steps do not resolve the issues, consulting a professional mechanic or HVAC specialist is advisable for a thorough diagnosis and repair.