After only owning the vehicle for about three months, the heat would not get warm while car is just sitting, only while driving. I have had it to the dealership 3 times so far-ready to go back for the fourth visit! The first two times they said it was low on anti-freeze and there were air pockets in the lines-so they added antifreeze and bled the lines. It only takes about three weeks before the anti-freeze is low again and the heat starts coming out cold while sitting. The third time and 4days later, after doing pressure testing, etc they still had no explanation for why it was happening or where the anti-freeze was going. They claim the pressure tests,etc do not show that there are any leaks anywhere. So at the end of the third day, they still haven't found a reason and where going to return it to me then they claim after the last test drive the tech found some slight condensation around the seam of the reservoir where the antifreeze goes? So needless to say the part was ordered and replaced and now three weeks later the heat is coming out cold while the vehicle is sitting. The vehicle also does not seem to idle or shift right but they have told me that is normal for this vehicle because it has more of a "trucky" motor. The vehicle only has 18,000 miles-was at 15,000 when the problem started-maybe even sooner being I'm not the first owner. This was my first Nissan and most likely will be my last. The window regulator also had to be replaced at 15,000 miles.