anyone help with this problem,1995 cse with acc.now i dont use on auto because either the clutch is goosed or it needs regassed,but until recently it would only blow hot air now it is only blowing cold air.i have tried a known good cabin temp.unit still no hot air,tried recalibrating no faults showing and the outside temp.display is correct.as it is getting rather chilly up here any help would be much appreciated.