[:@] after initial start, about 10 degrees hotter than outside air. Have in to service 3 X with no resolution. Anybody have similar problem?

thermostat could be it too......i know its not nissan related but same thing happened to my 96 vw jetta glx 3.1 stroker...it had a bad thermostat and it was blowing hot air and when you turned in to hot position it blows cool air...