"I want a cold coffee."

Translation: Εγώ θέλω έναν κρύο καφέ.

[xristo59]

Θέλω ένα κρύο καφέ without Εγώ should be considered as a right answer also.

[D_..]

Actually, it should be έναν, but your point is valid.

[AniOhevYayin]

Thanks for noting this, D_.. I paused for a second because I thought έναν was correct for accusative but the end of the clause had nominative καφές so I went with ένα κρύο καφέ

[Daveapricot]

I also agree! Who else could θέλω possibly mean other than 'I'?

[Anzjeliekje]

I put ένας and not έναν. Why it has τo be έναν?

[mizinamo]

Because it's the direct object -- the thing that is wanted.

So it has to be in the accusative case: masculine accusative έναν, not masculine nominative ένας.

[Kath656504]

is a frappe not a cold coffee?