Frage Heater controls /ventilation

Hello all,
Now that the evenings are getting cooler , I have tried to use the heater to keep warm without putting the roof up. BUT , I cannot feel any air flow or warmth through the windscreen vents, or around my feet . The heater matrix valve appears to working , I can see it moving and all the pipes are hot. The dash mounted air control appears to be working and I can hear flaps moving. The chrome nurled knobs appear to be connected, but have no effect. And the "Pull Air" controls by my knees move but again don't appear to cause air movement. The heater fan motor runs at two speeds but does sound tired, but again doesn't appear to result in any air flow into the car. I have followed the handbook instructions and tried many variations without success. Any tips please ??

Thanks





I didn't find the right solution from the internet.
References:
forum.etypeuk.com/viewtopic.php?t=2701

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