Some Mercury Monterey owners report experiencing issues with their AC blowing warm air most of the time, with only occasional cooling. This problem is often attributed to low refrigerant levels, which can hinder the effectiveness of the air conditioning system. Additionally, some owners have identified refrigerant leaks as a cause of inconsistent cooling performance, necessitating repairs to ensure proper AC function. Electrical climate control issues, including problems with sensors, wiring, or the control module, can also lead to warm air being emitted from the AC. Furthermore, a malfunctioning air conditioning compressor has been noted as a factor affecting cooling intermittently, while a defective cooling fan can compromise cooling efficiency, particularly at lower speeds. It is advisable for owners experiencing these issues to seek professional inspection and repair to restore the AC's functionality and prevent further damage or discomfort while driving.

Some Buick LaCrosse owners report experiencing slow acceleration due to various potential issues, including clogged air filters, dirty mass air flow sensors, and clogged fuel filters. These problems can lead to sluggish starts and delayed responses when pressing the accelerator. Additionally, some owners have noted that jerking during acceleration may indicate a misfire, while reduced engine power in 2010 models can sometimes be improved by applying electric grease to the throttle body connector and gas pedal assembly electrical connectors. Furthermore, a weak battery or malfunctioning alternator may also contribute to acceleration problems. It is crucial for owners to consider these factors to effectively diagnose and resolve slow acceleration issues in their Buick LaCrosse.