I laughed at your post, I'm sorry. Anyways, all I can suggest is try to share your knowledge about cars with her and try to teach her as much as you know. Good luck!

Well you solved it yourself. She usually doesn't drive, so it's not like she's going to know everything about the car instantly. Yes, it was a little bit airheady, but just teach her.

Poor girl, I mean it's an honest mistake for someone that never drives.

Well now you know she is only allowed to drive May through Sept. Problem solved.

"hey, pal. you just blow in from stupid town?"

My car is from 2008, so I don't know what more recent/more fancy cars are like, but in mine I run the A/C all the time. In winter when the heater is on the A/C dehumidifies the hot air to eliminate fog. It doesn't make the air cold again because incoming air passes through the A/C unit before it passes through the heating core, so they're not actually competing with each other. I don't know what's going on with your car but in cars like mine running both systems is normal.

Yeah, I was going to say, my 2010 still blows out hot air when it's set high even in A/C mode.

Thank you! Someone who understands how A/C actually works.

My car is 2016 and it still blows out heat with the A/C on too.

Umm... A/C doesn't make the air cold. All it does is condition the air, hence the name "air conditioner". Could simply be that the car hadn't had time to heat the engine before she tried to turn the heater on.

Um, what do you think "condition" means? Does it soften the air? Make it smell nice? Clue: The A/C actually does do absolutely nothing other than cool (and thereby dehumidify) air being blown into the car's ventilation system. When it's on and the controls are set to blow air at your feet or from the dashboard vents, it's just cooling the air to the setting you gave it on the temperature control. The "defrost" setting runs the air through the A/C coils to cool and dehumidify it, then routes it through the heater coils to reheat it, and then directs it though the upper vents in the dashboard toward the windscreen so it can evaporate and absorb the condensation on the inside.

Really?

#9, Youre partially correct, but have the cause and effect backwards. AC dehumidifies (and cools) because of the refrigerant that's used...regardless of what temp you set it to. It'll dehumidify if you have the AC running at max cool, or if you have the heat cranked up all the way. Dehumidifiers people in some areas have in their homes also use the same refrigerant found in your car AC system.

You're right. #9 doesn't know what they're talking about.

Thank you for the well thought out explanation. Useful.

You have a genius on your hands there don't ya?

Could have been worse, if it hadn't been set to A/C that could have been a sign the engine cooling had failed. She may not know a lot about cars, but at least she never blew the engine.

A/C heats up when you have it in heating