22-11-2013, 06:50 PM
The air con button wont do alot (especially on a 15 year old 306) but the recirculate button should help as it'll draw the slightly warmer air thats already in the cabin as opposed to the cold air from outside so will meaing your heating already warmed air compared to the freezing stuff from outside and also this should help warm the engine coolant warm up faster as you wont be blasting the matrix with freezing air.
That said I don't think it will make that much of a difference.
That said I don't think it will make that much of a difference.