Viscous coupling for a coolant pump

A coolant pump for circulating a coolant, comprising:

• a viscous coupling having:
• a housing part and an input body rotatable relative to the housing part, the housing part and the input body at least partially delimiting an interior space;
• a shaft that is rotatable relative to the housing part and on which an output body arranged in the interior space is formed for conjoint rotation with the shaft;
• a coupling region formed between the output body and the input body, the coupling region configured to hold a viscous fluid to assure a coupling between the input body and the output body;
• a holding chamber for collecting coolant leaking from the coolant pump;
• a housing wall conformed integrally with the housing part, the housing wall partially delimiting the holding chamber;
• and
• an actuator housing and an electric actuator therein by which a degree of the coupling between the input body and the output body is adjustable;
• and
• moving blades arranged on the shaft for conjoint rotation therewith to circulate the coolant;
• wherein the actuator housing at least partially covers the holding chamber;
• and
• wherein the input body is constructed in at least two parts including a pot-shaped base body and a cover which closes the base body, the base body arranged in the axial direction between the housing part and the cover, wherein an external thread is formed on the cover, and by which the cover is screwed into a mating internal thread provided on the base body.