- Ø Low coolant
- Ø Air in the coolant system
- Ø Malfunctioning heater core
- Ø Failed (or failing) thermostat
- Ø Low refrigerant (will generally blow cool, but not cold)
- Ø Damaged compressor
- Ø Damaged compressor clutch
- Ø Damaged expansion valve
- Ø Damaged evaporator
- Ø Worn or stretched serpentine belt