What To Check When A/C Compressor Is Not Turning On

2011 Hyundai Tucson with Air Conditioning blowing warm air, the system is is fully charged with refrigerant and the A/C magnetic clutch is not engaging. Our focus is on the electrical part of the A/C system doing some basic checks to repair this vehicle.
Tools Used in this video:

[@dextersmithbsee]

Very good! This guy is a very good troubleshooter. I love how he used and interpreted the electrical schematics properly.

[@sean3620]

Absolutely THE best AC troubleshooting video I've seen!!!!! Great job! Thank you for making this video!

[@n0t0vicri0us]

Very well done. It's relieving to watch such a professionally put together informative diy.

[@jmoreno7576]

Very well explained carnal

[@yassinecharifi6928]

The best video I have ever seen, you did an awesome job explaining all the details.

[@beerwrenchgarage]

Excellent video Hektor - youre a consumate Pro. Thank you for taking the time to make such a high quality and INFORMATIVE video. Love to watch you work when it comes to electrical diag - you break it down simple style for us potato heads - I always learn from watching you. Keep em coming Bro!

[@davida871]

A system low on refrigerant would not allow compressor to engage as well. Excellent video troubleshooting. The only thing I would've done is purge the yellow line once removed from vacuum as it has outside air. Use Schrader valve to purge air out before adding to low side. Nice job

[@Math.F-C]

After getting new testing tools, ripping the car appart while doing the diagnostic, I was about to go a lot deeper when I remembered your comments, you were right, I was only low on refrigerant, so much time wasted. I least I learned new things. Thanks for your comments!

[@arnoldruiz9362]

😢⅞u

[@wilfredoortiz3150]

Good catch

[@cia1209]

Is it really that simple? The AC on my 2018 ELANTRA started blowing hot air two weeks ago plus the sensor that reads the outside temperature stop working because the dash no longer displays the outside temperature. Plus the AC button on the climate control has been flashing often on like the compressor is trying to kick on but it’s not.

[@rocketsstorm3070]

Appreciate it lmao

[@basilioalvarez2013]

Liked the way you explained about the ac clutch and checked the fuses and wiring. Good mechanic.👍👍👍👍👍

[@Bruno-mw3mm]

Wow this was very detailed. Keep up that good work

[@advancedleveldiagnostics]

Welcome back! Great video thanks! since you are mobile what do you use to discharge the system in the field?

[@jgeorges3061]

Hector, long time where u been as always good information and approach how to check the A/C thanks for sharing.

[@ricardosom7766]

You gave a pretty good and clear explanation on how to troubleshoot it. I have the issue with my car, tried to recharge Freon but I noticed that the clutch is not engaging so I’ll follow your tips to see if I find where the CHINGADERA isn’t working. 😂😂😂😂😂🤣🤣🤣🤣😂😂😂😂😂😂😂 Juts loved when you called it “chingadera”

[@kylekinsey5541]

Excellent video! Very impressed with the knowledge you just shared in this video😎💪🏼🙌🏼 I’m diagnosing the same problem is how I come across your video.

[@Mike_44]

Awesome troubleshooting/diagnosis! Thank you so much for posting.

[@fernandoestrada5831]

Glad to see you back Homie Hector

[@petergarofolo9385]

Welcome back. Missed your videos. 👍 👍 👍

[@stanleyleith6781]

Good morning hector. I am learning a lot from your video. Now, where can I buy a portable temperature gauge like yours. Just tried eBay and saw none like yours. Thank s in advance.

[@richardvega1060]

Thank you hector great information and instructions

[@johnnysalazar1552]

Your a badass verry well explained I'm gonna do that check on my 2013 vw beetle bug 2.5not getting power

[@frudda]

Im into failsafe of computer systems but often in videos they describe to much for beginners which is very annoying , i can understand that you are pro and if you havent taking your lessons you should not mess with this. Love to watch it anyways 💯

[@robertmedina6875]

Nice to see you back!!

[@ur_boy_los]

Lol I enjoy the edits and all the effects. Makes the information more enjoyable. What state are you located in?

[@easylearn9350]

The AC compressor test part is very good. Thanks! However, you may mention those other steps need to be done with professionals and not DIY, unless they have all the expensive tools you use. ;) I'm also wondering why expensive repair (say ~ 1000 box for the original part) while you could change the coil and clutch with less than 100 box.

[@primosanchez6604]

Thanks for the info! Very knowledgeable!

[@aw_overland]

Another solution is replacing just the compressor clutch instead of the whole compressor, which saves time and $$$ money.

[@raymundocarlos5790]

gracias hector ....que buen diagnostico hiciste ....ya me suscribi a tu canal .....veo que eres muy inteligente...

[@kjarby69]

Best darn informative video!!👍👍 Well done!

[@maethamaalazawy3125]

Great video thank you. very much. I wish. I have one like you. to fix my same problem. in Austin, TX. Thank you again.

[@PogonaCraze]

My 2011 mini cooper was vacuumed and recharged and the compressor just refuses to turn on. I checked for power and the wiring has no power going through. I then checked fuses and relays which were fine. Will check the auc sensor and climate control modules, as well as the ecu (kinda far fetch, but I'm desperate. Been out of AC for 2 summers now in desert AZ). Any recommendations would greatly be appreciated (no I'm junking my car...yet)

[@smartvato500]

Amazing way to explain. Thank you.

[@jesrobles6405]

Is it possible to just replace the clutch instead of the whole compressor??? More affordable? Thanks

[@FernandoRodriguez-ds5ri]

Yes if that’s the main issue

[@Papidaddyyanky]

What could cause the ac comp 10amp fuse to keep blowing up??

[@kevinmaharaj08]

Something i notice with the hyundai is that the ac compressor oil does evaporate out of the compressor causeing high readings going up in the yellow

[@sethrich2790]

Excellent🎯👏🏼. Thank you. How…., did you remove the 134 that was, in the system??

[@abasologto671]

Amen good video but in my case I connect I testing the compressor connected directly from the battery to the relay in the compressor is start spinning but when I disconnected the wire from the battery the stop

[@MRiadh]

Very well explained practically showing everything. Really you know your profession very well. Great video. God bless you. Thank you, sir. 😍😍👍👍❤❤🌹🌹👏👏👏👏👏🇵🇰🇧🇷🇺🇸🇨🇭

[@dzorba1]

so is the red side open> You said you were charging the low side only, but when did you open the high side. You had to open it to see a reading, but when?

[@mudd8844]

Thanks man perfect example

[@sayedjalil3606]

Hi brother thanks a lot for your video help a lot's please take care

[@tommurphy5757]

You are a fine teacher

[@Tootallfordoorways]

I changed my ac compressor out because the clutch messed up. But new clutch won't engage. I don't have those tools you have to test, is there another way to test?

[@jesusmelchor7681]

Have the same problem man. Mine engages if give it direct power so I know it works. Gonna have to take mine to the ac mechanic.

[@blueblooded4831]

Your a gem brother

[@victorserrano6380]

Question ? 🙋🏻‍♂️ you used the same vacuum pump for residential A/C for the car?

[@DTUFINOPhotography]

My AC Compressor is not engaging, but i can move it freely with my hand, but i also checked and am low or empty on Freon, it was working fine several weeks ago, but in NYC its winter so i havent been really paying attention until today. No AC, no Compressor engagement.... could it just be that i'm low on freon? I'll add some and see if it kicks in.

[@jorgemora7190]

Very good job homi thanks homi l like it

[@richardmiranda709]

On the AC compressor, do you primer it before installing it with compressor oil?

[@cxx1953]

Did you have to measure how much pag oil was in the old compressor and match the new compressor with that amount so it doesn’t fill the system with too much pag oil if there’s more pag oil in the new compressor than what was needed to replace what was in the old one

[@jarlaxiko]

Great video! 😃

[@mikeyvlado7665]

I’m haveing same problem compressor won’t engage clutch won’t work with out useing paper clip in the reLay please help me tell me wh❤at

[@WorldAri91]

Nice vid bro, i have a 05 murano was blowing cold before i over charged it by mistake and it stopped working. i changed my compressor with clutch, changed ac pressure switch, changed the ac fuse which was blown and still no cold ac smh my next step is the ac relay if that dont work i dnt know what else to do, any suggestions?

[@AutomotiveServiceExcellence]

oh man long time no see!

[@agentbrickschannel4523]

Help. The AC Compressor kicks in when bypassing the relay but not when I turn it on from the inside. Can it be that it doesn't have enough gas pressure in the system? Or is it that theres a cut wire that sends the signal to turn on the AC?

[@luismelendez935]

My car ac stop working, and i bought the compressor like 2 yrs ago brand new, change the compressor relay and still nothing. I put direct power to the compressor and it kicks on, any suggestions and i vacuum the whole system and replace the pressure switch new ass well.

[@Mike_44]

My ‘05 Subaru Outback A/C Climate Control Unit stopped working. I wish you had a video on troubleshooting this.. I’m going crazy lol

[@RobertoTapiaBernal]

So ac clutch wasn’t engaged because it was low on Freon? Or it engaged because you pulled vacuum?

[@VeryPersian]

Always change condenser and drier at same time

[@oscargarcia1345]

Where can I find those diagrams, that u showed on your video.

[@johnnyramirez9082]

Bad ass Diag dude

[@paag.7308]

Wow a master tech!

[@yassine6711]

Excellent video

[@juancarlos-mj6kq]

Really good video. But I noticed that you didn’t change the filter drier. I need to change my compressor but they keep telling me I absolutely need to change out the filter drier but taking the entire front end of my vw Jetta is not an option for me. Is it okay to just put in the new compressor WITHOUT changing the filter drier?

[@lifeview9690]

oh, why not A/C magnetic clutch replace only ?

[@dantec8854]

Mine only kick in with the paper clip at the sensor box but not on the accumulator wire sensos. Any ideas

[@user-tk1ec1hd4e]

its the flux capacitor

[@kings1048]

Could you have just changed the clutch and not thr whole compressor?

[@odek88]

Can you make a video on how to empty out the Freon.

[@TheMemo1776]

my chingadera 2001 chevy silverado don’t have power to pressure switch all the fuses r good can u help

[@valg2521]

compressor engages if bypass relay. power does't go to relay. pressure and temp switches are working. what else problem can be?

[@Lunchmeat18]

I’m having a similar problem. I’ll completely empty the system and when I try to fill it it’ll literally say it’s completely full after barely putting anything in. So I’m assuming there’s a blockage somewhere. Not sure if there’s a more common place to check for blockages. Any recommendations would be appreciated. Btw I’ve already checked all fuses/ relays. I also checked high side pressure switch which happened to not be closed. Thought I figured it out. Replaced that and it’s still not closing. So I’m not getting enough pressure on high side for switch to close even tho when I put gauge on it says it’s completely filled. Any info would be appreciated!

[@vazquezraul84]

I have exact same problem with my AC system on a 2007 town country Chrysler, when I started to add frion to the system it tells me is over fill but I checked the pressure on the valve low side and there's very little frion, question what could be the problem?? is the compressor it self wrecked? is it computer wrong out put to AC system?? also when I disconnect the pressure sensor the clutch engaged but after I plug back the pressure sensor switch the clutch stops working, what could be the problem??help any one please??

[@Lunchmeat18]

@@vazquezraul84 that’s really weird that when you disconnect the pressure switch that the clutch engages. Usually that only works if you jump the switch, closing the circuit. Seems like the computer is reading things wrong and telling things to do or not do things that it should/shouldn’t. Any chance you have an obd to read the data?

[@RaulPerrs-lz7fz]

Expansion valve or pressure valve ac

[@jeffmosier3145]

Very well explained

[@blahblah4874]

Great video new sub

[@geraldoyo1]

You da man Hektor!

[@rayponder8478]

I have a 02 f 150 ac clutch not pulling in I have power to my plug on the switch in the cab I have power to my fuses and relays but can't get anything to my compressor I checked the continuity of the switch and it checked good but one of the prongs has a good bit of movement so I'm thinking long shot of bad cab switch or broken wire? Any thoughts?

[@slamdunk6170]

Good job

[@drerey4675]

Video helped a lot. Wish you were local to OC CA. Need mine fixed before I leave to basic training

[@kandula13]

I have seen other videos where they said you need to add oil to the new compressor, too. Iknow the compressor comes with around 3 oz inside, but is it necessary to add at least another 2 oz can?

[@ultilife31]

If there is no ac. Is leaked the compressor engages or not

[@MrELauj]

very nice video !!

[@some_car_guy]

I dont get power at the conector, (yellow wire) but I do have power on the fuse and the relay, you think the wire is damaged?

[@liyo4950]

Took my car to AAA Auto Repair Center on Tully Rd in San Jose to repair the air conditioning. They told me that the compressor was bad (which I had already figured out since it had a frozen clutch..couldn't push it in by hand while engine was off). I know compressors cost about $300 but they were going to charge me over $1500 to replace it. Then, later, they called me and said they would have to also replace the receiver drier and that would cost another $400 or so. So, after I went back to pick up the car, I looked under the hood and saw a nice shiny new compressor but couldn't see the receiver drier until I got home. Turns out that the receiver drier is like welded to the side of the condenser and has a plug on the bottom that needs to be removed in order to insert a cloth-like cylindrical shaped tampon-looking "drier" that takes moisture out of the system. That's all they did...and they charged me over $1900. The drier "tampon" can be bought at auto stores for from $15 to $35. And the compressor can be bought for about $300. My car is a 2014 Hyundai Tucson. Once you take off the splash panel under the engine of the car and look up at the bottom of the "condenser", on the driver's side of the vehicle, you can see and access the "receiver drier" plug to remove an then to insert the "tampon". I couldn't drain the coolant into a collector before removing those parts so I had to have all this work done by "professionals". Funny, not, how the government will fine you big bucks if you let the coolant escape which helps contribute to global warming but they have no problem sabotaging gas pipelines like the Nordstream pipeline which belched tons of gas into the atmosphere for many days! It's no wonder we are having high, record, temperatures. Wars don't help either. Same thing happened after WWI and WWII..record high temperatures worldwide! Thanks a lot Putin...you son of a b...!!! Putin needs a "b" to the head!!!

[@hearditfirst8010]

Spending $2000 on an ac is ridiculous, unless maybe you live in Florida or Arizona. At that price I will have to fix it myself or it won't get fixed. I'd rather tolerate the 3 months of summer with the windows down. I care more about the heat than ac

[@italianozuzu1232]

​@@hearditfirst8010Texas too . I pay 1000 .with parts . Condenser ac compressor and refrigerant .

[@hearditfirst8010]

@@italianozuzu1232 Thank God I live in NY, so it's only 2 months of hot weather. With my windows and roof down, I can barely feel any heat. My compressor just went out, the mechanic quoted me $1000, I ran the hell out of there. Compressors are like $200. I will fix it myself, but I'm not even in a rush because we are now in winter and the summer heat is just 2 months.

[@screamfredi3753]

How did u check the fuse with jus the black fuse?

[@smerk429]

Hi brother thanks for your videos I'm a subscriber. Question please... I have a 1995 Lexus LS 400. The radiator fan is not activating. It does work because i tested it. I disconnected the connector that's connected to the ac receiver drier and the radiator fan turns on and stays on continuously the whole time. But when I reconnect the connector the radiator fan turns off. I'm trying to fix the fan so that it turns on when I turn on my air conditioner but the fan does not turn on when I turn on the AC. I feel like it has something to do with that connection but I'm not sure. Do you think I might have a bad sensor that's connected to the receiver drier? Thanks. Anybody knowledgeable please reply soon.

[@FernandoRodriguez-ds5ri]

My 2011 srx only blows cold air on the passenger sid only, and sometimes it just blows warm air everywhere. What can be the issue

[@CNSTAdventures]

Sounds like a blend door to me

[@josephsalazar4712]

What about is the compressor is clutching ?

[@sc9475]

Why was the pressure so high when the compressor wasn't running?

[@chikaworldpeace3446]

Because it’s not compressing if the compressor was running then the pressure would be way lower

[@condocord7544]

excellent!

[@Chuyito6O2]

When I try to turn on my ac my rpm’s go up a lil and the ac doesn’t come out cold any ideas on what it is?

[@ValeCabron]

Stick this “CHINGADERA” over here! Ok?😂

[@eduardolizarraga7400]

Why not just switch out the clutch?

[@robertmedina6875]

You must be like me, and you decided that you didn’t wanna work for employers anymore! Always seems like they want to pay you as little as possible and give lots of BS ! Great video!!

[@parkerbohnn]

They sort of decided for him some guy ratted him out at Firestone for making videos on youtube.

[@cesarmedina3395]

The best video la neta

[@leonardomaldomado9674]

En mi carro el compresor entra cuando va corriendo y tiene aire frio, al bajar la velocidad deja de enfriar, alguna sugerencia, gracias por tu atención

[@javiertapia2293]

Tus abanicos son los que trabajan con la banda? Tengo una silverado que hacia lo mismo Le cambie el fan clutch por abanicos electricos y ya volvio hacer eso

[@leonardomaldomado9674]

@@javiertapia2293 son 2 abanicos de motor eléctrico los que lleva,

[@javiertapia2293]

@@leonardomaldomado9674 Tal vez el condensador este tapado Si los abanicos no pueden jalar aire necesario por el condensador, el freon no se mantiene a su temperatura adecuada

[@leonardomaldomado9674]

@@javiertapia2293 voy a cambiar condensador, evaporador, válvula de expansión, y el acumulador, compresor y creo las mangueras, una pregunta, las mangueras que salen del compresor llevan filtro?

[@javiertapia2293]

@@leonardomaldomado9674 Unas llevan orifice tube Adentro de la manguera

[@edforthewin8574]

How much PÁG oil do I put on a compressor?

[@danielmachado2841]

How much would this cost to get done

[@DarleenFraley]

Can I reset ac by pulling fuse then putting back in? Should car be running? Should ac be running?

[@Ray_Ray]

Wondering the same.. Did this help yours “reset”?? Thinking with the same logic. I’m thinking ultimately a new compressor is the answer like in this video

[@nadaiMel]

Fantastic!

[@xxx-mike-xxx9007]

Very good

[@trojan5532]

The link to the tools is not working

[@Tumusica311]

What if no air is blowing through the vents?

[@FernandoRodriguez-ds5ri]

It’s the blower motor

[@cristianeduardo019]

Hey bro why does my radiator fan turn off when i try to turn the ac on. As soon as is off it turns back on to cool engine. I know there’s something with the ac the clutch turns on but blowing fire at the vents 😂 any advice

[@seanyoung3535]

Need contact info, Do you take cars locally. Pomona is close by need a dignosis on a dtc code Mustang 2016 GT

[@cesarmedina3395]

Tengo un Infiniti g 37 y hace lo mismo el compresor don’t engage