I believe it controls how long the glow plugs come on for when you turn on the ignition and when the vehicle is running until it gets to temp.
 
welll......

A well is an excavation or structure created in the ground ––by digging, driving, boring or drilling to access water or oil in underground reservoirs. The well liquid is drawn via an electric submersible pump or a mechanical pump. It can also be drawn up using containers, such as buckets, that are raised mechanically or by hand. Although not essential, a storage tank with a pressure of 40-60 psi is usually added to the system (after the pump), so the pump does not need to operate constantly. To reduce the electricity required to pump up the liquid, often, a cistern is also added along with a small second pump.
Wells can vary greatly in depth, volume and quality. Well liquids and especially water typically contains more minerals in solution than surface water and may require treatment to soften the water by removing minerals such as arsenic, iron and manganese.


does that help?:behindsofa:
 

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