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I'm still working on the narrative and text to briefly explain the function of each of these major components... That Part 1 just shows the big stuff connected to the a/c plumbing... There are umpteen switches, sensors, actuators & other gubbins associated with the control plane, but we'll get there
The Perfectionist
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Audi Class Concours winner Stoner Park 2014, ADI Concours D'Elegance Class Winner 2008, Runner up 2014. Winner, S2Forum Show'n'Shine Billing 2006 & 2008.
Something to add to this after waaay too much spent poring over schematics across the S2/RS2 production. There is slightly different behaviour in how different fans are used when aircon (or climate control) is switched on. I have simplified it down to this.
3B Engined Coupes only - When a/c or climate is turned on:
1 - The cabin fan is forced on at lowest speed (can be overriden by controls to make it blow faster but never stopped)
2 - The radiator fan runs at the 2nd Speed (aka Hi-Speed-1) ALL the time. This is same speed as if radiator thermoswitch F18 activates
3 - In the event that aircon/climate switch F23 activates (very high pressure) then the radiator blows at 3rd Speed (maximum rate)
4 - The maximum radfan speed can also be triggered if radiator thermoswitch F54 is closed
ABY/ADU Engined vehicles - When a/c or climate is turned on
1 - The cabin fan is forced on at lowest speed (can be overriden by controls to make it blow faster but never stopped) - same as 3B
2 - The radiator fan runs at the lowest Speed (aka Lo-Speed) - this is same speed as when afterrun mode is triggered. It is actually the afterrun pump controller that triggers this fan speed as a result of signalling from ECU and aircon/climate system.
3 - In the event that aircon/climate switch F23 activates, the radiator increases to Speed-2
4 - The maximum radfan speed is reserved only for when radiator switch F54 is closed.
Strange but true - according to the schematics at least - anyone care to prove me right or wrong ?
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