Mechanical Problems

Possible locations or 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(s).
• Inoperative, obstructed or improperly installed blend-air door.