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Thank you Daniel, I'll see if I can find the flapper. Re U-connected hoses; I've once done it myself after the matrix frooze and burst.

Hello everybody, I have just bought a Nubira CDX 2lt petrol. :D, Everything works well but no interior heating. :o Engine temp normal, demist fan works OK. Does anybody know where the valve controlling water flow to the heating matrix is located and how is it linked to the hot/cold knob on dashboard...