Behavior 2: Faulty circulating pump or faulty changeover valve
Auxiliary heater temperature increases. Heat exchanger temperature does not increase. The coolant temperature of the engine remains constant (image 2).
| No | Designation |
|---|---|
| 1 | Coolant flow rate |
| 2 | Heat exchanger temperature |
| 3 | Heat exchanger for heating system |
| 4 | Changeover valve |
| 5 | Engine coolant temperature |
| 6 | Auxiliary heater temperature |
| 7 | Auxiliary heating |
| 8 | Recirculation pump |