Heater only blowing Hot Air

[DaveVectraSRI]

Hi Guys,

On the way home from collecting pizza the other night my car decided to only blow hot air. At first i thought this was very clever that my car could recognise i was carry food that needed to be kept warm but then i realised that this was not intentional and surely is a fault

Seriously though it will only blow hot air, everything else seems to be working properly, im not 100% sure where to start with this so if anyone can give me some advice?

PLEASE

[ed taylor]

I wonder if it is a servo motor that blends the hot/cold air not working?
Have a look here, espacially post number six.