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Explanation: The German work 'Stern' can be and is applied to almost anything that has a shape resembling a starfish or asterisk (both called, not coincidentally, Stern) -- i.e. having several arms extending from a common centre. This usage is very common among German mechanical engineers.
IMO that this is a mounting bracket that holds the fan motor and fan (assuming an electrically powered fan, which is common on a lot of small cars now, particularly front-end drive models) with several arms extending from a central housing or mounting plate.
The traditional English term for this is 'spider', but it is doubtless being displaced by 'star' as a result of translations from German.
Der Lüfter wird mittels Bajonettverschluss in die runde Aussparung eingedreht und über den Lüfterstern mit zwei selbst schneidenden Schrauben fixiert. Somit trägt er zur Versteifung der gesamten Vorderwand bei. http://tinyurl.com/6a5col
(German patent document; retrieve the PDF version and see the descrioption on PDF p. 12 with reference to the Lüfterstern (28) and the Sternformige Armen 32, along with the drawing on p.18)
A sheet metal fan construction for a radiator cooling system, the fan construction being of the type including a fan spider defined by a central disc having integral,radially outward extending arms, the disc adapted to rotate about an axis passing centrally and orthogonally therethrough... www.patentgenius.com/patent/4172693.html