Hi new to the forum and looking for some help.
I have a 2012 Exp EL, its black (yes i know) and I live in AZ where it is super hot. When i first got it the AC seemed to work better.
Now it seems to take forever for it to cool down and likely will not unless I get on the highway and run at high speed for about 30 minutes. This only changes a little if it was in the garage prior to the trip or not. I took it in to have the AC looked at and they say nothing is wrong and its just a big car with lots of windows. It has electric fans and you can hear them roaring but it doesn't feel like its moving much air.
My question is if its 100+ outside what temp should i be able to get out of the vents? Right now i get about mid 50's at best. I am working to get some gauges to be able to look at high and low side pressures vs static.
A 30 degree drop across the evaporator is what you can expect. Your mileage will vary, and the vent output temps will be higher when you're sitting still simply because the radiator fans don't pull nearly the same amount of air across the condensor as driving does. Plus, when you're driving, that hot air pulled from all the coolers up front gets "left behind", but while you're stopped, it tends to swirl around the engine compartment and gets recycled back across the coolers.
What color is your interior? The large cubic volume of these vehicles can carry a huge thermal load; the more there is to cool, the longer it takes. Add in the heat being added by the sun still coming through the windows, and the outside air turning your windows into heat exchangers.
Do you open the windows when you start driving? When you're parked, the inside air will be hotter than the outside air (unless you park in the shade).