JDA110 ENGINE CRACK...??

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Hello to everybody...i am Vaios from Greece.
I want to ask about a problem that i have with my terios. I bought it on August 2005, still in warranty. My problem is that in the cooling circuit there is air flow and we dont know from where is coming. Our official representative in Greece has made all checks and as a bottom line he told me that maybe it is an engine body crack.
We have excluded radiator and other parts.
Can i claim an engine change? Can i send an e-mail to japan or wherever its plant is???
The car is over a week in the official representatives service area and i need it, because my work is on a 24/7 basis and they cant give me a replacement car.
My S/N is JDA1102G000571074.

Thank you so much for any responce...