no heat in car at all help

[ancol]

hi guys got a 2001 s type and the expansion bottle was leaking so fitted a new bottle on quite a while ago now, the other night dropped a bit cold so wife wanted heater on but alas no heat checked bottle and its upto correct level could it be an airlock and if so where does one bleed it from, or could it just be a coincidence and be the heater valve thats playing up. btw the car is reading normal temp on gauge so 99 percent sure its not thermostat aircon and all else works fine

[ancol]

thanks for the advice chaps much appreciated will have a look in the morning at points mentioned cheers