Mercedes-Benz CLS63 AMG Questions

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The radar system shuts down, apparently due to lack of feedback from other vehicles.
i noticed that the cooling system -fluid- not circulating which is cause high temperature and poor Air Condition is on ..
the fluid circaltion not running due to coolinn fan not working properly , what is the cased of this problem?
when the car running and air con. running too, the engine fan making hi sound ?
Check engine light came on tech told me the left cam shaft adjuster needs to be replaced is this really bad and should I give the car back I just got it 3weeks ago. Will the engine blow if I keep driving it?
codes were erased but no work was done how many mile must I drive for the engine light to come back on. Code reads left camshaft adjuster.