this post was submitted on 02 Sep 2026
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Car defrost cycles are explicitly for the windows, not the coils. You still haven't explained the magic mechanism by which an air conditioner dehumidifies air that's colder than the coils, just pointed to the existence of condensate like that makes your point somehow. I already covered that the air conditioner can dehumidify air cycling through the car if humidity is building up from something inside it.
The coils are not designed to freeze. Ever. Having to manually defrost the coils by turning off the A/C (you have to do it manually because no system is designed to work this way, because that would be a stupid design) and run warm air through it means your system is malfunctioning.
Take the last word, if you want. Arguing on the internet is pointless.
Does the HVAC engineer seriously need the mechanism of condensation explained to them…?
Coils frost, glass can frost, you’re ignoring reality for your textbook numbers.
It can also freeze, because it’s -20c outside lmfao.
i mean, the guy who ran one of the local hvac companies lived down the street for a couple years. steve had his head wedged so far up his pucker that i'm pretty sure he didn't even understand the repair manuals. inherited the company from his dad and had the attitude that goes with it.
I'm inclined to believe him over you or the other guy 🤷. I'm not an HVAC engineer, just a rocket scientist turned data analyst.
Using quotes from your textbook, please explain why it’s called deFROST. If what you’re saying is true, it would be decondensation or something along those lines.
Spoken like someone talking out of their ass and making shit up, if what you’re saying was true, we wouldn’t be “arguing”. You would be providing facts, you could also provide sources to back up your asinine claims as well….
They already explained that, because it's intended to defrost frosted windows, not because it defrosts frosted condenser coils. How would you even know when to use it if that was the case?
Spoken like someone arguing for the sake of arguing, aka, a troll. Have fun under your bridge!
The deFROST button that looks like this?
It is quite obviously defrosting the windshield. Its other use is removing condensation from the windshield.
That’s the front and rear defrosts mate.
Ones curved to show the front windshield, the others flat to show the back window.
Yes, that's what the thread was about. You claimed that cars defrost AC coils, not windows.
So I don't know anything about the math or physics of the situation, but I do actually work on cars. A car has both and evaporator and heater core. Meaning it is capable of using the evaporator core to act as a dehumidifier before the fan from the blower motor pushes it through the heater core and up into the cabin. The heater core gets it's heat from the engine coolant. When the heat is activated a little internal door opens and runs the coolant through it. I'm assuming you'd understand the rest. But thats why it takes time for your hot air to blow. The engine hasn't heated up enough to transfer it to the coolant.