Some Pontiac Bonneville owners report experiencing issues with their air conditioner not blowing cold air while idling, which may be attributed to several common problems. These include low refrigerant levels, which can prevent the AC system from cooling effectively, and compressor malfunctions that hinder proper operation. Additionally, a clogged cabin air filter can restrict airflow, impacting cooling efficiency, while dirt buildup on condenser or evaporator coils can disrupt the heat exchange process. Some owners also note that a dirty or sluggish blower motor may lead to inadequate airflow, resulting in warm air instead of cold. Furthermore, issues with fuses or relays can disrupt the AC system's functionality. It is recommended that owners check these potential issues to effectively diagnose and resolve the cooling problem.

Some Pontiac Bonneville owners report experiencing starting issues after replacing the fuel pump and crankshaft position sensor, which may be attributed to several factors. These include improper installation of the crankshaft position sensor, which can prevent the car from starting, as well as the possibility of a faulty replacement sensor. Additionally, damaged sensor connectors or wiring may lead to similar starting problems. Weak batteries or corroded terminals can also impact the starting process, regardless of recent sensor replacements. Furthermore, issues with other engine systems, such as fuel, ignition, or air intake, could contribute to these starting difficulties. It is advisable for owners facing these issues to thoroughly check the installation of new components and inspect the overall condition of the vehicle's electrical and engine systems.