Mechanical Problems
Possible causes of insufficient heat:
- Inoperative A/C heater control
- Inoperative blower motor system
- Inoperative engine coolant thermostat
- Inoperative, obstructed or improperly installed blend-air door(s)
- Low engine coolant
- Obstructed cowl air intake
- Obstructed heater system outlets
- Restricted cabin air filter