This nifty little gadget is fitted to all UK specification diesel powered cars to act as an auxiliary coolant heater when temperatures are below 5ºC reducing the time taken to for the engine to get to operating temperature. A side-effect of this is that it also reduces the time for the cabin heating to work!
It’s rather temperamental and will stop working for almost no reason. This is my troubleshooting experience trying to get this little known gadget back into service.
The Trials of a Range Rover Sport Owner 
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