do you get a loan car when the car is in for warranty repair?

Not usually. But it depends what it says in your warranty if you have an extended one. Also depending on the dealership that you go to, they may offer you a loaner while the X is being worked on.

I have had all service done at a single dealer and they have been very good and offered me a loaner at times when I have asked. Sometimes it has just been a used car off the lot that they have let me "test drive". They have been very good to me.