Electric coolant pump
With this engine, in addition to the usual mechanical coolant pump, an electric coolant pump is installed in the coolant circuit.
The pump is secured onto the cooling fan housing via a retaining device.
The coolant pump is only activated whenever the coolant temperatures exceeds a critical value . This can occur in particular if the engine has been operated at a high load for a long time and is then parked immediately afterwards. For example, after a long motorway journey at high speed, with subsequent parking at a service station. This can lead to an excessive build-up of heat around the engine after the engine has been switched off.
The PCM activates the electric coolant pump to prevent any damage due to this build-up of heat.
It can therefore be the case that the electrical coolant pump continues to run for a certain period of time.
| Item | Description |
|---|---|
| 1 | Reservoir |
| 2 | Heater core |
| 3 | Oil cooler |
| 4 | Thermostat housing - small/large coolant circuit and bypass valve |
| 5 | Cylinder head - exhaust side |
| 6 | Short block thermostat |
| 7 | Cylinder block and cylinder head - intake side |
| 8 | Mechanical coolant pump |
| 9 | Electric coolant pump |
| 10 | Turbocharger |
| 11 | Radiator |
With the electrical coolant pump activated, the coolant flows through the turbocharger to the coolant expansion tank and from there through the mechanical coolant pump in the short block to the electric coolant pump.