I done the thermostat mod a few weeks back,what a difference.roasty toasty after a few minutes. Can't believe nobody done this in the 16 years before I took the car on.
If it's a diesel check the temp gauge gets up to the half way mark, if not then it's not getting up to full temp, costing you fuel, and you need the inline thermostat mod, and at this time of year the grille blanking mod, both readily found in posts on here