How to Fix Your Car's AC for Free - How Air Conditioning Works

  • Published: 22 May 2018
  • Car air conditioning explained and how to fix car ac for free. How air conditioning works in your car, DIY with Scotty Kilmer. How to fix your car's AC for free. How to keep ac blowing cold. How to diagnose car ac problems. How to check car ac. Steps and tips to keeping your car's AC working ice cold all summer. How to fix car ac that's not working. You don't need a bunch of expensive equipment to maintain your car's AC system. DIY car repair with Scotty Kilmer, an auto mechanic for the last 50 years.

    ⬇️Scotty’s Top DIY Tools:
    1. Bluetooth Scan Tool:
    2. Cheap Scan Tool:
    3. Professional Socket Set:
    4. Wrench Set:
    5. No Charging Required Car Jump Starter:
    6. Battery Pack Car Jump Starter:

    ⬇️Things used in this video:
    1. Common Sense
    2. 4k Camera:
    3. Camera Microphone:
    4. Camera Tripod:
    5. My computer for editing / uploading:
    6. Video editing software:
    7. Thumbnail software:

    🛠Check out my Garage to see what I use every day and highly recommend:

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    This is the people's automotive channel! Learn how to fix your car and how it works. Get a chance to show off your own car on Sundays. Or show off your own car mod on Wednesdays. Tool giveaways every Monday to help you with your own car projects. Or enter your own car to compete in the Car vs Car contest every Thursday. We have a new video every day! I've been an auto mechanic for the past 50 years and I'm here to share my knowledge with you.

    Here's our weekly video schedule:
    Monday: Tool giveaway
    Tuesday: Auto repair video
    Wednesday: Viewers car mod show off
    Thursday: Car vs Car Contest AND Live podcast, car question and answer
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    Saturday: Second Live podcast, car question and answer
    Sunday: Viewers car show off

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Comments • 1 107

  • Scotty Kilmer
    Scotty Kilmer   1 years back

    ⬇️Scotty’s Top DIY Tools:
    1. Bluetooth Scan Tool:
    2. Cheap Scan Tool:
    3. Professional Socket Set:
    4. Wrench Set:
    5. No Charging Required Car Jump Starter:
    6. Battery Pack Car Jump Starter:

    🛠Check out my Garage to see what I use every day and highly recommend:

    ► Subscribe and hit the notification bell for all new videos:

    Scotty on Social:
    Facebook ►
    Instagram ►
    Twitter ►

    • paulplj20024
      paulplj20024  3 months back

      1st off, there is going to be A "know it all" person to tell you how to fix your issue without really knowing or seeing your car at all, in witch, I find really, but truth is, without knowing what kind of noise your talking about or where its coming from, is going to be hard for anyone to really tell. Just saying. hope all goes well for you.

    • Brandi Gibson
      Brandi Gibson  4 months back

      I’m located in Texas. Where are you located buddy? I’ll come to you. I want YOU to fix my cars AC lol. So serious.

    • Chuck Wh
      Chuck Wh  5 months back

      95 conversion van turn on the switch nothing happens he only defrost

    • Mariana Avalos
      Mariana Avalos  9 months back

      You stay in Houston I need your help

    • LeAaron
      LeAaron  1 years back

      Hey SCOTTY! Before i go complete ham on my car and start tearing the whole front end off. Maybe you can help. When I have the car on and running with the ac on max with the windows down and connect the ac134 with gauge to the car it shoots to 120 psi ish. I'll try and add Freon to the system but not a single drop will go in. Not only that but the entire time the clutch for the compressor will not engage. Right now my car will only blow hot air or outside temperature air. Not cool refreshing air. Again at no time does the clutch engage. Both fans run on that radiator. And when I connect the ac134 can. The pressure stays at 120psi and doesn't move regardless. and the system will not take any Freon at all. Any idea before my mad scientist brain starts tearing everything apart? Because I can always buy a new car, but I'll likely find a way to fix my lady before things get that bad hahaha.

  • tolis bergidis
    tolis bergidis  3 weeks back

    I thought it was Dennis Hopper😅😅

    • Auzzie Skate Crew
      Auzzie Skate Crew  4 weeks back

      Learn more than school here

      • BigKia MzNationWide
        BigKia MzNationWide  1 months back

        😱😱😱😱I wish u was in Houston tx so I can get my car fixed right..🤔🤔🤔🤔🤔🤔

        • MysteriousPandaGaming
          MysteriousPandaGaming  1 months back

          Scotty I need my ac fix how much do you charge?

          • BR C
            BR C  1 months back

            September 2019 crew is here

            • Star wizard Man tlc
              Star wizard Man tlc  1 months back

              i have a 88 toyota sr5 with 400,000 miles on it should i fix the ac?

              • Paul Brownman
                Paul Brownman  1 months back

                Scotty, where is the vacuum inside the cab that sucks out the hot air?

                • yuck mouth
                  yuck mouth  2 months back

                  Hi, I hope this reaches you. My A/C doesn't work; but, when I turn it to 0, I can feel something coming out. When I turn to to 1 or higher, It makes a weird noise. My car is a 2006 Hyandai Elantra.

                  • Miko Yumi
                    Miko Yumi  2 months back

                    What about if ac don’t blow air in car ?

                    • Gliese 581c
                      Gliese 581c  2 months back

                      What a great guy. Thankyou, this is very informative

                      • Holly Rose Moss
                        Holly Rose Moss  2 months back

                        I wish this guy was my dad! So knowledgeable and cool!

                        • Holly Rose Moss
                          Holly Rose Moss  2 months back

                          My car was blowing cold air until today, it is blowing hot air. Help! I don't want to pay for an expensive fix.

                          • Steven Kyle
                            Steven Kyle  2 months back

                            My ac was blowing air but it wasn't cold.i dealt with it. But now it has completely stopped blowing air. What could it be?

                            • Shaquoya The Model
                              Shaquoya The Model  2 months back

                              I know I saw some Tree in thats Filter 🤔😄

                              • Mark Krupa
                                Mark Krupa  3 months back

                                So informative and helpful. Thanks.

                                • Tisala
                                  Tisala  3 months back

                                  Why am I even watching this?

                                  • Kevin Willbur
                                    Kevin Willbur  3 months back

                                    I've seen that banana car 3 times in the last month. Now I see it in your video.. WTF

                                    • Rocio Maya
                                      Rocio Maya  3 months back

                                      Love your videos Scotty, thanks so much!!

                                      • skeglar
                                        skeglar  3 months back

                                        He didnt go over the compressor

                                        • Go Bonobo
                                          Go Bonobo  3 months back

                                          Thank you so much! I’m sitting in my burning hot car and have no idea about cars. I am learning so much!

                                          • KRISHNA KATHA
                                            KRISHNA KATHA  3 months back

                                            Sir my car ac switch on.but compressor not start .compressor clutch is OK then why problem sir plz reply

                                            • paulplj20024
                                              paulplj20024  3 months back

                                              WAY TO MUCH COFFEE DUDE! but very nice video, Thx

                                              • Edgar Aragon
                                                Edgar Aragon  3 months back

                                                00 Ford windstar I'm getting cold air in the front but hot air in the back ,
                                                What's wrong with it?

                                                • honey bear
                                                  honey bear  3 months back

                                                  I tell you you must be a real a-hole if you dislike someone trying to help you fix your air conditioning in 90 degree heat thank you Scotty:)

                                                  • Miss yeye Yeye
                                                    Miss yeye Yeye  3 months back

                                                    I'm sad because I need my air conditioning fix I don't have the kind of money to fix it and they charging me 100 dollars just for them to look at my car ware I live 😭😭😭 is 90 degree out and I try to put that can freezon in the L tube the arrow marks red so I don't know what do do 😭

                                                    • Cesar
                                                      Cesar  3 months back

                                                      i can help you sweetie

                                                  • Hope Love
                                                    Hope Love  3 months back

                                                    My ac blower works but the push buttons on the console keep switching on and off at random times. Kinda like there's a short or something in the console. Any suggestions what is happening? I can keep pushing the buttons and sometimes get it to come on again but not for long.

                                                    • yash gurav
                                                      yash gurav  4 months back

                                                      My gas seems to be full but the air don't seem to be getting cold when I on ac

                                                      • Raymond Kostanty
                                                        Raymond Kostanty  4 months back

                                                        The evaporator doesn't suck heat out of the cabin; It releases cool into it. When high pressure refrigerant enters the evaporation, the pressure and the temperature drop. He should have mentioned that when any gas (freon in the case) is compressed, it gets hot. That heat is what's dumped into the air by the condenser and fan.

                                                        • Raymond Kostanty
                                                          Raymond Kostanty  4 months back

                                                          Typo error: "enters the evaporation" should be "enters the evaporator".

                                                      • Kevin Jones
                                                        Kevin Jones  4 months back

                                                        Scotty Kilmer's sign language school is cool

                                                        • M. Massport
                                                          M. Massport  4 months back


                                                          I have 1996 Ford Aerostar (120k) whose AC system has gone totally empty while sitting waiting for unrelated work to be done. The system won't hold proper vacuum to evacuate moisture. Dye from a previous charge shows faint mist pattern on front of clutch face, leading me to believe the loss is at the shaft seal, if not normal amount anyway??. I'm not beyond doing a master rebuild kit if I have to, but am curious to know if I'm supposed to charge system entirely (54oz. of r134) to get proper results if I try a leak sealer first. Logistically, when will I vacuum to remove moisture?

                                                          • Adam Palm
                                                            Adam Palm  4 months back

                                                            I checked the cabin air filter on my Toyota Corolla, just like in the video. Right behind the glove box, I pulled out the filter- and the Walmart bag that was restricting the air flow. Working like a cool dream now. Thanks!

                                                          • A P
                                                            A P  4 months back

                                                            hahahaha Scotty I love you. You are too cool.

                                                            • JM T3
                                                              JM T3  4 months back

                                                              Thanks Scotty 👍🏻

                                                              • S&M Pr0d
                                                                S&M Pr0d  4 months back

                                                                My guy came out the trunk 🤨💀

                                                                • Davey Bernard
                                                                  Davey Bernard  4 months back

                                                                  When you allow liquid to expand into vapor, stuff gets cold.

                                                                  • عراقي وافتخر
                                                                    عراقي وافتخر  4 months back

                                                                    I make a nice tricks install extra fans kits with cut out engine will live more air condition is freakyyyh freazz

                                                                    • Rachel Fenicle
                                                                      Rachel Fenicle  4 months back

                                                                      Thanks Scotty! This really saved me from myself. Going to the mechanic before I blow the whole system up

                                                                      • mr T
                                                                        mr T  4 months back

                                                                        Being a auto aircon technician for many years its a intresting trade to have

                                                                        • Deepinder Singh
                                                                          Deepinder Singh  4 months back

                                                                          Clean non offense comment

                                                                          • cgasieni
                                                                            cgasieni  4 months back

                                                                            I made a cabin filter from very good house filters, could that cause an AC system to fail? Air blows as normal, but does sound like it's working slightly harder.

                                                                            • Chuck Wh
                                                                              Chuck Wh  5 months back

                                                                              I have a G20 95 AC doesn't work when I kick on the switch only works defrost not on the vents

                                                                              • Chuck Wh
                                                                                Chuck Wh  5 months back

                                                                                I have a 95 G20 conversion Van turn the switch on doesn't kick on any help

                                                                                • Raiders Nation
                                                                                  Raiders Nation  5 months back

                                                                                  Why does my air conditioner only blow on the floor

                                                                                  • Lepnin Gaming
                                                                                    Lepnin Gaming  5 months back

                                                                                    Ty for the info:)

                                                                                    • Jason L
                                                                                      Jason L  5 months back


                                                                                      My wife has a 2008 Kia Sportage V6 awd w 130k miles. We have had it since 12k miles. Over the past year;

                                                                                      -I noticed on long trips the AC would stop blowing cold but if you turned it off a minute then back on it was cold again (and repeat). Dealer said the evap sensor was bad and would cost 800, have to take dash off. So I passed on that and kept driving as is.

                                                                                      *Then, it started intermittently not working even on short trips. They recharged the freon or whatever. It was fixed briefly then started doing it again a few weeks later.

                                                                                      *Finally on the 4th or.5th time I had it in there they said a diagnostic showed it WAS also the evap sensor. So i bit the bullet and had the Evap temperature sensor or whatever replaced.

                                                                                      **Well now a few weeks later on a long trip.I realized it STILL doesnt work after 40 minutes or so and you have to turn it off or seitch between recirculate and non recirculate or turn it off and back on.

                                                                                      -So now I am out 1000 bucks and my dash squeaks from them taking it off. How should I handle this???

                                                                                      Luckily my other car is a 93 Toyota MR2!! Thanks Scotty!!

                                                                                      • Natalie Marie
                                                                                        Natalie Marie  5 months back

                                                                                        Thanks for making this video. I’ll have my dad watch it so that he can fix my car’s AC 😂🤷🏻‍♀️

                                                                                        • Muhammad AJR
                                                                                          Muhammad AJR  5 months back

                                                                                          My AC works in the afternoon much better than the night or the morning. It does not make sence since the afternoon is hotter in general here in the UAE. Can you please help

                                                                                          • TeraVolt
                                                                                            TeraVolt  5 months back

                                                                                            What compressor do you have? Harrison V5 and Delphi CVC for example are supposed to work that way... ice cold air only when you need it... to save fuel...