New forum member with 2018 G80 5.0 with around 20,000 miles in central Florida. I feel vindicated or at least confirmed not crazy i.e. reading all post with air cooling problems in G80. We've had car over year and these problems just popped up this summer. NOTE: Hadn't done lot of long trips until recently so may be reason?? Usually 30 to 60 minutes or so that problem creeps up (although has happened sooner). Always keep on Climate system on AUTO around 76. When air starts feeling hot, turn down air to 72, does NOT get cooler. Sometimes air blower sound like blowing at super high speed but hardly any air coming out. Of course acts perfectly try to show anyone or take for service at dealer. Dealer did changed out Thermostat (same as Resistor?) month ago > did not work. Now waiting on condenser part to come in. Used hand held heat meter and noticed when "problems" start happening, passenger side nice and cool and 10 degrees cooler than driver side. I too noticed that by turning entire CLIMATE system to OFF and waiting as long as can and then back on. Sometimes air will blow out cold & high right away and other times have to turn off and on until get back home after long trips. Problem sometimes happens quickly even at night but always when very hot & humid and especially when rainy I love this car but unhappy all trouble with cooling system (and apparently, every other 2018 G80 owner!). I will post any good news or updates. Seems like lot of other forum members may or may not have found fixes i.e. actuator door; system is "overcharged" and needs to be reduced; drain, flush & refill system, fan, blower motor, cabin filter, evaporation sensors, etc., etc..) but haven't posted updates (or if ok for while and then starting happening again) or maybe, got fed up and got another car!!!