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Gentlemen,
I know your frustration!
Recently had the evaporator coil sensor replaced, approved by Genesis engineers.
Haven't had an opportunity to take the car on a long drive, and weather has gotten colder.
Not optimistic that the problem will be solved.
However, at the advice of engineering,
Keep climate control on AUTO, and fan to FRESH AIR.
As per Genesis, the system will otherwise freeze up, and designed to redirect air flow to evaporator coil to defrost.
Thanks for the advice. Will be traveling next week and will probably need it.
 

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Same exact problem. Brought G80 to Key Genesis in Jacksonville & left it for several days & they couldn't replicate. You would think Genesis would be all over this for their "Luxury" brand. Very disappointed. Also, can't understand how this could be a Freon overfill problem as it certainly seems related to heat to me. If overfill problem, wouldn't it occur at all times rather than only when it gets hot?
 

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Freeze up number 4. Same as above after 2-3 hours on the road. Dealer now has evaporator coil sensor on order. Head tech says this has happened on 4 Hyundai Tucsons (same engine?) and have changed out and none have returned with same problem. Says it's South Louisiana heat and humidity. Will see.
 

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We are having the exact same problem on our 2018 G80. After about 1 hour of driving, cold air flow stops. The only way to get it back is to shut off the Climate control system for about 5 minutes then it comes back on full blast. Just spoke with the factory. They said they are aware of the problem but have no fix. Hoping someone on here finds a solution that we can take to the dealer and have them try. They do not want to drive the car for 1 hour to see if what they are doing has fixed it.. So far, nothing has worked after 2 years going back to the shop and the last time spent 1 week there.
 
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