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.