well, as I have PAS, the stat aint a 20 minute job, its 35 minutes, but as I was taking it apart i have drained the PAS to change the fluid.
I also pulled the alternator off as the connections needed a good clean, - and its mounting bracket as it needed a lick of paint.
and then the SO CALLED HORRIBLE job.
1, throw away the haynes book of lies - it misses out some keys parts

2, go for it, remembering people saying about the top clips.
3, take 65 minutes to remove the offending item.
So, all i gotta do now is order the bits and then rebuild it.
Conker - Water light was flashing - temperature was all ok. I got stuck in traffic, stuck the heater on full and whoosh, car steamed up and footwell got all warm and damp.
Only when i investigated did I notice that the bottom hose was cold - thus the stat is stuck shut and the back pressure was too much for the Matrix. ( so says the nice AA man )
So, where do you al get ya matrixs from, have I seen somewhere that you should use a MK3 one

??