Insufficient Heating or Defrosting

Insufficient Heating or Defrosting Diagnosis (1 of 2)




Insufficient Heating or Defrosting Diagnosis (2 of 2)
The most likely causes of insufficient heating outside the heater system include a low coolant level, faulty thermostat, partially or fully clogged heater core or hose, obstruction to air circulation, or an air leak past a faulty seal into the passenger compartment. For an organized diagnosis procedure, refer to Insufficient Heating or Defrosting.