Auxiliary Coolant Pump
The auxiliary coolant pump is an electric pump attached on a bracket, at the rear left side of the engine.
When the engine is turned off the auxiliary coolant pump provides engine coolant flow to prevent engine coolant boiling in the turbocharger and in the integrated exhaust manifold.
The auxiliary coolant pump has a three pin connector. One pin receives a permanent battery voltage, supplied from a fused output from the Battery Junction Box (BJB). The second pin has a hardwired connection to the PCM and the third pin has a ground connection.
SEPARATOR
| ITEM | DESCRIPTION |
|---|---|
| 1 | Hose connection - Coolant expansion tank |
| 2 | Hose connection - Exhaust manifold |
| 3 | Hose connection - Turbocharger |
| 4 | Hose connection - Thermostatic Valve - Automatic Transmission Fluid (ATF) cooler |
| 5 | Hose connection - Auxiliary coolant pump |
The separator is a swirl pot, which is required for the active degas of the cooling system. Due to the higher position of the engine, the separator creates a vortex in the engine coolant. As a result, the gasses from the engine coolant are transferred to the coolant expansion tank.
The separator also provides an engine coolant feed for the turbocharger.