Infiniti Repair Questions? Ask a Mechanic for Answers ASAP
I have been a professional master mechanic for over 35 years and am happy to help you with this.
Yes most definitely the t-stat should be replaced. The part about the heater really confirms it.
My goal is that you are pleased with my answer(s). I strive for a 5 star positive rating. It's the only way i get credit. You can still ask me questions for free after the rating.