"Where are you going?"
Translation:Où est-ce que tu vas ?
A liaison occurs between a consonant and a vowel, not between vowels. Sometimes, a dummy T is added if the link between two vowels is disturbing.
Yet, there is no conflict between the sound "ou" and the sound "a" or "e"
"où + a" = [wa]
"où + est" = [wɛ]