AndyLotus wrote:Thanks all, I'll try and keep track of all the bits and cost. I shall also try to make sure I take some photos.
Angus: Thanks for that. What exactly do you mean by 'related to engine speed'? I was under the impression that as long as the switch was pressed the clutch was engaged, assuming no leaks, pressure incorrect etc.
I'm trying to decide whether to use all the existing control components or allow the trinary switch, I shall fit, to control the fans. In theory if forward speed is sufficient then I shouldn't need the fans to be on all the time, only at slow speed or stationary.
I hoped point 2 was the case, it helps to keep things simpler without needing a separate stat for the evaporator temperature.
Working a bit from memory, but ISTR that the clutch doesn't engage until engine speed is over 1000 rpm - and the throttle jack is there to keep it at that when aircon is on full auto mode on SEs. On base & SA it should drop out at 700rpm and not re-engage until 1000rpm.
(this is all based on a normal idle being 950rpm according to service notes) It also disengages if the frost protection sensor kicks in or if there is low pressure in the system to protect the compressor.
Then there's eco mode where it cycles on and off, providing less cooling but saving a bit of fuel. I think the system uses the same principle as the frost protection, but set at a higher temperature and also seems to have higher rev limits for drop in and out, but that could be my imagination.
