Abstract: The disclosure relates to determining condition data indicative of a blockage of a thermal unit of a heat pump system of a vehicle. The heat pump system can further comprise an air supply unit. A corresponding method can comprise receiving, by a controller comprising a processor, model data indicative of an air flow through the thermal unit and the air supply unit, wherein the model data is based on a model of the heat pump system, receiving, by the controller, measured data indicative of the air flow through the thermal unit and the air supply unit, wherein the measured data is measured via an airflow meter of the air supply unit, and determining, by the controller, the condition data based at least on the model data and the measured data.

Abstract: A tubular bushing (26) assembly made of plastic material and disposed in an opening (24) defined by a pair of spaced sheets in a seat back (14) of an automotive vehicle to adjustably support each of the posts (22) of a headrest (20). The bushing (26) comprises an outer sleeve (28) presenting ribs (32, 34) for engaging the edges of the opening (24) in each of the sheets of the bracket of the seat back frame (18) and an inner sleeve (30) for insertion within said outer sleeve (28) for slidably supporting the post (22) and having hoop rings (46, 48) for forcing the outer sleeve (28) radially outwardly to deform the ribs (32, 34) about and into gripping engagement with the edges of the openings (24).