Mechanical Problems

Possible causes of insufficient heat due to mechanical problems are as follows:

• Obstructed cowl air intake
• Obstructed heater system outlets
• Inoperative engine thermostat
• Inoperative blower motor system
• Inoperative A/C-heater control
• Inoperative blend door actuator
• Inoperative, obstructed or improperly installed blend-air door
• Restricted cabin air filter