MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat due to mechanical problems are as follows
- Obstructed cowl air intake.
- Obstructed heater system outlets.
- Faulty engine thermostat.
- Faulty blower motor system.
- Faulty A/C-heater control.
- Faulty blend door actuator(s).
- Faulty, obstructed or improperly installed blend-air door.