AC & Climate Problems
2 symptom guides — select what your car is doing.
AC Not Blowing Cold Air
AC not blowing cold means the HVAC system is moving air but not removing heat properly, or it may not be moving air at all. Common causes include low refrigerant from a leak, compressor clutch/compressor failure, bad pressure sensor, blown fuse/relay, blend door issue, condenser fan problem, or clogged cabin air filter if airflow is weak.
HVAC Smell Diagnosis
Unusual smells from the heating and air conditioning vents can come from several sources. A musty or sour smell — especially when the AC first turns on — is almost always mold or bacteria growing on the evaporator coil or inside the HVAC housing. A sweet smell suggests coolant from a heater core leak. A chemical smell may be refrigerant. A burnt smell from the vents can be a blower motor issue, burning dust on the heater core, or a wiring problem.