How the AC and Heat Work in your Car

In this video we take apart the heating and air condition unit to see what’s inside and how it works!

There are four main functions in your car’s heating and air conditioning system, including the air source (recirculate and fresh air), fan speed, temperature and vent mode. All of these happen behind the dashboard in the HVAC unit. These are a subset of the air conditioning system (including compressor, condenser, drier, expansion valve) and the heating circuit (engine, radiator, thermostat and water pump).

The heater A/C box in this video was from a 2006 Volkswagen Jetta. Main components include the recirculating flap and its motor, blower motor, blower motor resistor, air filter, housing, evaporator core, thermostatic expansion valve, heater core, electric heater, temperature control motor, mode selector gears and mechanisms as well as vent valves.

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[TurboSol]

It's amazing just how much engineering goes into literally everything and we never know anything about it, things 'just work'. Lots of smart people did a lot of thinking to make our lives so comfortable.

[forrest]

There's no one in the world that can explain that so good and easy to understand. A little fast but no bullshitting. Straight to the point and explain in quite a bit of detail. Seriously he just taught a whole semester of classes in a few minutes

[nishantdebbarma]

Engineering is an art… very few people are aware of these mechanisms that are in the background the work with the push of a button.. Very informative video ❤✨

[samoopsd]

That's very impressive! Someone, or a team had to design all those ducts and mechanisms to fit in a rather small space and not rattle around when driving!

[robbflynn]

Great job, respect to the people that designed this, you’d think they’d go wrong all the time with the amount of stuff packed in there.

[sangeethsylus]

Some guys explain the practical and others the theory part.But you explained both with diagrams.Well done bro.❤

[CP-mbly]

After seeing this I fully understand how the AC system actually works!

The freon that heats up as it cools down air turns into gas and has to be turned back into a condensed liquid (cooler) and compressed to be used again. Really smart design!

[I.LOVE.ISRAEL.]

Mind blown to the level of engineering involved in here!

[dataman]

You've really mastered your craft. A pleasure to watch and be educated

[djperry]

Very good and speedy explanation (as opposed to slow and boring) of the entire AC process and related equipment. Thank you so much! 5 Star review!!

[edmondho]

You are the only one explained so so so clear and very detailed. I really appreciate of your video.

[rakeshganiga]

No one can explain in a better way as you did. Simply Amazing!!!..Thanks a lot for the video.

[toninocars]

You are legend 👍
I haven’t seen more complicated hvac on any car period

[jiwu]

Bro you are amazing. Everything is well explained with one toothbrush.

[juancuelloespinosa]

this is very well done. I love the schematics to help visualize everything

[niloyu]

Watching from Al Khafji Saudi Arabia thank you for very informative Vlog

[jonnyduncan]

So well explained on such a complex, clever engineered system..

[dehypnotizer]

Amazing videos. Thank you for doing this. Even though I knew the principle of how it works I never saw it disassembled. I hits me how cheap and prone to failure the components are. Crappy little hobby motors, plastic gears without a lick of grease - it's terrifying.
Thank you for showing us this!

[ivannavi]

What an awesome video. I have a Mk5 Golf which has this unit so I’m amazed at what is under my dashboard.

[auntbarbara]

There is simply NO other channel like this