Mercedes Benz repair: 1991 300TE wagen, climate control unit, mercedesshop

Question
I have a proplem with the temperature insid the car somtime I hear somthing clicking under the dash seconds later the car is vary hot few minits later it cools of to start again, is that mean I need a mono valve or temperature control or what.
thank you

Answer
Possible control unit, Sampler Blower Motor or sensor issue.

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