Hello, I took my 2015 Versa 5spd on a road trip from FL to NY. Three times the evaporator froze partially and the volume of air comming out of the vents decreased severely. It only does this when it is on recirc and I am driving on the highway for several hours. Dealer says it is normal? Anybody have any experience with this? I was thinking the thermo amp is not positioned correctly or is malfunctioning but wanted to see what others say before pushing this further with the dealer.