The custom is (for Ashkanazim) that a shecheyanu is not made during the three weeks. See Siman 223 Sif 3 where you see that for "celim chadashim" (new vessels) a shecheyanu is made; in practice, ...
Possible Duplicate: Would you make a Shehechiyanu when you lease a new car? Does one make a shehechiyanu on a leased car or other large/expensive item?
When you purchase a new car you would make a Shehechiyanu. Would you also make a Shehechiyanu if you leased a new car?