2008 Infiniti M35 Questions

All 2008 Infiniti M35 Questions

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My car has 80,000 miles and now the heat blows cold when sitting still. Any ideas what would cause that and how do I fix it?
Occurred 1300 miles out of warranty. Service person at dealership said never seen it before.
I have never heard of this before in 52 years of owning automobiles including Cadillacs, etc? The car has 48,000 miles.