i have a d2 td5 200 vintage and got a feeling the flap that controls the flow of air through the heater matrix when heat is required or closes it of when cooling is required is not operational, heat is no problem but when cooling is required cant get it cool even with the aircon, which is fine if you start up from cold air is icy but gets warmer as the engine temp builds, all the other flaps for where the air goes i.e. screen feet vents etc. work fine, is there a fuse for this flap or are they vacuum controlled any help much appreciated.
john
john