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Components not located in passenger compartment, group of components "1" > < Components for control and regulation of air conditioner not located in passenger compartment

A4 Mk3

Components not located in passenger compartment (all models)
Components not located in passenger compartment (all models)
  Note
t  Components not located in the passenger compartment and only fitted on vehicles with a high-voltage system (hybrid vehicles) or differing from those in vehicles with no high-voltage system → Chapter „Components not located in passenger compartment on vehicles with a high-voltage system“
t  Detaching coolant hoses from connections to heat exchanger of air conditioning unit and attaching → Chapter.
t  For incorporation of heat exchanger of air conditioning unit into engine coolant circuit, refer to → Engine, mechanics; Rep. gr.19.
t  Depending on the vehicle production period, certain models may be fitted with joints in the refrigerant lines (not planned at present, introduction not yet finalised) → Electronic parts catalogue. As is the case with the connections at the various components, these joints are only to be unfastened after draining the refrigerant circuit → Chapter and → Air conditioner with refrigerant R134a.
t  On vehicles with a 6-cyl. petrol engine or other engines with certain optional extras (e.g. vehicles with a start/stop system) but with no „auxiliary heater“ optional extra are fitted with a coolant circulation pump -V50- (a coolant pump -V36-) → Chapter and → Engine, mechanics; Rep. gr.19.
t  Depending on the version of the air conditioner operating and display unit, Climatronic control unit -J255-, the coolant circulation pump -V50- may also be referred to as coolant pump -V36- in the guided fault-finding routine → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
t  The design of the coolant circulation pump -V50- (coolant pump -V36-) and pump actuation differ depending on the vehicle model and production period. As of Model Year 2012 and depending on the engine, the pumps fitted as of the start of production and actuated by way of a 500 hertz signal (500 pulses per second) are gradually being replaced by pumps actuated by way of a 100 hertz signal. The pumps actuated by way of a 100 hertz signal additionally feature a diagnostic function and are generally actuated by way of the corresponding engine control unit. Attention is therefore to be paid to correct assignment (only the assigned pump can ever be actuated) → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051, → Current flow diagrams, Electrical fault finding and Fitting locations and → Electronic parts catalogue
t  Components not located in passenger compartment, group of components „1“ → Chapter
t  Components not located in passenger compartment, group of components „2“ → Chapter
t  Components not located in passenger compartment, group of components „3“ → Chapter
   

Components not located in passenger compartment, group of components "1" > < Components for control and regulation of air conditioner not located in passenger compartment