And here was me thinking I had all the bugs ironed out of my Climate System

I have a 1997 Omega Elite, I noticed today with climate temp set to 19 the air was cold, I increased the temp to 22 as it was a cold day but after 5 mins thought bloody hell it's still cold in here, to cut a long story short the only way to get hot air through any vents was to set the temp to HI only the climate control. I had this problem before on a VW and it was a broken wire on the sensor on top of the dash.
I also noticed the wooden trim surrounding the 4 round climate control buttons was very hot to the touch.
I just want to get any input on this before I go dismantling the dash yet again!!