I just dont know what to say about all this. You are a glutton for
punnishment that exceeds only me.Why do you want to remove the upper
thermistat housing anyway?Because it is there? Gotta be done when the water
pump is replaced,but you are not doing that.If you try to take off those
2 ,10mm bolts (after being told not to 15 times,I bet)your glutton exceeds
mine.You come in from the water pump side anyway when removing the
upperhousing. At this point look real hard at your water pump.Is it
looking anything other than new?Consider changing the pump while you are 60
or 70 percent there already.Only $65 more/bus depot.That little hose is
reattached while the o-ring is being pushed in , all at the same
time.Ready? 1-2-3 push/shove all at once.Use anti sieze commpound
everywhere-hoses and bolts.Use a lubricant like antiseize compound on the
little hose.Both clamps ready ,and pre installed on the little hose,all the
way to one side.My little hose from BD had to be trimmed to fit-get an new
one!  Use  RTV on the o-ring, but smooth the inside of where it seats with
sand paper first.Currently,there is crusty stuff in the groove.When you are
done, dont forget to put in your thermistat.The compressor needs to be
removed from the mount(are you now thinking about water pump replacement?
you should).Dont have to disconnect it-use a coat hanger to hold it
back.Lots of agony in the archives about water pump changing on a 1.9.Your
housing issues will all be covered there.Seek in out! Roger