3 Symptoms Of A Bad AC Pressure Switch [HIGH OR LOW] & DIY Fixes

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  • Опубліковано 30 вер 2024

КОМЕНТАРІ • 82

  • @MechanicBase
    @MechanicBase  9 місяців тому +7

    Did you solve your AC switch issue? Let us know in the comments below how you did it, and maybe you can help someone else with a bad AC pressure switch!
    Don't forget to like the video and subscribe to our channel!
    More information: mechanicbase.com/ac/ac-refrigerant-pressure-switch-symptoms/
    Website: mechanicbase.com/

  • @RUSHnRoulet
    @RUSHnRoulet 6 місяців тому +20

    I’ve done this over two decades, I like watching others explain. You sir explained it very well, great job 👌🏼

  • @richardmoorer2668
    @richardmoorer2668 4 місяці тому +31

    Low pressure side is the large tubing, high pressure is small tubing

  • @JamesMcNamara-j1g
    @JamesMcNamara-j1g 5 місяців тому +30

    Your hand deserves a special mention for its hard work in explaining the content for your viewers.

  • @1776FreedomNow
    @1776FreedomNow Місяць тому +2

    i have a 94 civic. it has a Dual AC pressure switch (detects high and low pressure). is there a way to bench test the pressure switch with a vacuum pump/gauge? the service manual doesnt have any specs for bench testing the switch.

  • @kkenneth100
    @kkenneth100 5 місяців тому +4

    I've done heating cooling work. This is the first I've heard of the low pressure switch on the small liquid line.

  • @mdoubleu4028
    @mdoubleu4028 5 місяців тому +3

    Great video… Explain a lot of questions I had about my AC… I replaced the switch and it works awesome now… Thank you

  • @charliejohnson5630
    @charliejohnson5630 9 днів тому

    Boss you don’t know what you’re talking about! Low pressure lines are bigger, high pressure lines are smaller

  • @m.t.v.7934
    @m.t.v.7934 3 місяці тому +1

    How do you know what pressure sensor is the bad one? Low or high? I do not have a high end scanner but it did pick up a code (B1079) and most common fixes says "Replaced A/C Refrigerant Pressure Sensor" but doe snot tell me high or low? Any ideas? It is on a 2013 Lancer

    • @mikerizzo167
      @mikerizzo167 3 місяці тому

      Just put your hand physically on each one, you will feel which one is clicking. Just like with relays

  • @jameshrenn
    @jameshrenn 5 місяців тому +1

    Overkill with the hand gestures 😆

  • @hastur_kinginyellow5310
    @hastur_kinginyellow5310 Місяць тому

    334$ auto zone
    140$ o rielys

  • @danielploy9143
    @danielploy9143 3 місяці тому +1

    Can a faulty switch cause Freon to leak out?

    • @ronaldh2246
      @ronaldh2246 2 місяці тому +1

      Theres a valve BEHIND the pressure switch on my truck just like the low line. Youre supposed to change them ALL at the same time to avoid a leak happening in one of the other ones. They sell a kit. Comes with 2 caps for the high and low lines. 2 shrader valves ans a valve for the high line under $15

  • @DavidKedwell
    @DavidKedwell 6 місяців тому +2

    Hi, please confirm that the low and high pressure lines are identified correctly in the video.

    • @thromboid
      @thromboid 6 місяців тому +3

      I'm pretty sure the high pressure line has the smaller diameter, and the low pressure line is fatter. The service port caps should be labelled L and H to identify clearly.

    • @jeffreybarrett1910
      @jeffreybarrett1910 5 місяців тому

      High pressure connection is larger on mine but line is smaller

    • @JamesMcNamara-j1g
      @JamesMcNamara-j1g 5 місяців тому

      Just watch the hand.

  • @earthisfat6184
    @earthisfat6184 6 місяців тому +7

    My compressor is coming on. No short cycling but my ac lines don't even get cold. Full of correct amount of refrigerant.

    • @shannonprice525
      @shannonprice525 4 місяці тому +1

      That sounds like a blockage in your ac system. I'd start with the cheapest fix and replace the expansion valve and drier filter after recovering the Freon from your system and then recharge after replacing both the expansion valve and drier filter

    • @earthisfat6184
      @earthisfat6184 4 місяці тому

      @@shannonprice525 I got the expansion valve. Going to install it first and see if my levels change. My high and low side were staying equal even with my compressor engaged. Problem is my car takes an oddball compressor that's hard to get.

    • @A.Musa76
      @A.Musa76 3 місяці тому +1

      Actually before you do anything hook up the AC pressure gauge first (I used the Recovery machine). I’m in the same issue. I narrow it down to the Compressor Control Solenoid Valve. (Part is in transit).

    • @earthisfat6184
      @earthisfat6184 3 місяці тому

      @@A.Musa76 me too. I just replaced the compressor and the expansion valve. Working fine now. Mine takes a very rare compressor that was only used on a few hundred cars too. Found a used one.

    • @A.Musa76
      @A.Musa76 3 місяці тому +1

      @@earthisfat6184 That's great you got your A/C working. I got mine working over the weekend. It was the A/C compressor solenoid valve was the culprit for me.

  • @Thunderbyrd.
    @Thunderbyrd. Рік тому +6

    Great info and well explained, I'm going to test my switches as my ac and compressor clutch stopped all of a sudden when the air was good and cold. There were no noises like I've heard from clutches going out, so I think maybe it's a switch because fuses and relays are testing good.
    And finally, someone who cares enough about their car to keep the engine bay clean. Everyone else on YT are doing tutorials with dirtiest and nastiest engine bays on the planet, lol.

  • @kanenstuff
    @kanenstuff Місяць тому

    Watching a bunch of videos as my aircon in my E36 325i will not turn on until driving the car for 30mins or so, sometimes its working and freezing over. If its turned on its cold, but unless the green light is on there too much moisture and wil cause mold in th hot humid Asian climate. So if its cold and no green light is on I cant use it if I park it in the sun them it works its a weird issue.

  • @alonsonavarro2126
    @alonsonavarro2126 4 місяці тому +1

    Great info, even better presentation and explanation. Thank you, sir.

  • @EvolOne-ic5xv
    @EvolOne-ic5xv Місяць тому

    Bought a car 2 weeks ago that ac blew very cold, but all of a sudden now, it's just warm. Does anyone know exactly what it is ?

  • @louperkins5497
    @louperkins5497 6 місяців тому +1

    What obd app was that? I want to get a Bluetooth one that works the best with the most options.

  • @stephtraveler7378
    @stephtraveler7378 Місяць тому

    great vid but you got the tube size backward. large tube is low pressure.

  • @shojo8708
    @shojo8708 2 місяці тому

    My car tried to stall when I had the AC on and I saw white smoke coming out of the ac vents that went away after a few seconds. I turned it off then when I got home 20 miles later the car stalled then started. What do you think the problem is?

  • @jacquescarrera7180
    @jacquescarrera7180 3 місяці тому

    Hi guys where is that ac pressured switch located on a passat B8 TDi...?
    I cannot find nothing on the Internet
    Also on passat B8 is tgere a low pressure switch and a hight pressure switch or just 1 switch . I found 1 switch near the fuel filter but I am nir certain that is the one. ( coukd it be the fuel switch..😂)
    Thank you

  • @hassannihat1512
    @hassannihat1512 Місяць тому

    If the switch is faulty would the out cover plate still spin with the pully whether the air-con is on or off as I can't hear the compress clutch clicking?

  • @angelobarros1992
    @angelobarros1992 4 місяці тому

    Who gives a shit about his hand.
    Listen to what you can learn from him

  • @MrRohanstar
    @MrRohanstar 3 місяці тому

    My friend spend hundreds to replace compressor, change all seal condenser, on a 2019 hyundai kona and still no ac ,it uses 1234yf freon ,I'm thinking pressure switch or computer command wire,I scanned the system with autel 908spro no code ,al 3 fuses are good ,I command the relay on with key on engine off and the clutch clicks with engine running try to command relay on fails

  • @ismaell615
    @ismaell615 3 місяці тому

    Do you then an impact can make the sensor go bad ? I hit a bad pot hole and my ac stop working there no leaked or broken wires and the fans are not spinning, which makes me think it’s the sensor

  • @jimmyjones8021
    @jimmyjones8021 4 місяці тому

    Where's my switch on my 2019 Chevy Impala at

  • @JayZapata-bi6tk
    @JayZapata-bi6tk 4 місяці тому

    I have a 08 dodge avenger and I can't find my ac pressure switch
    4:13

  • @jonathantrejo6853
    @jonathantrejo6853 7 місяців тому +1

    Hello I’ve replaced my ac compressor, my condenser, also the expansion valve and I’m still having trouble with my ac. It blows really cold then cuts out. I’m leaning toward the ac pressure switch any ideas what it could be? 🙏

    • @niftysin
      @niftysin 6 місяців тому

      Does it work intermittently? Like when you first start your car it works then just shuts off.

    • @wdchaconpereira
      @wdchaconpereira 6 місяців тому +1

      @@niftysinyes

    • @niftysin
      @niftysin 6 місяців тому +1

      @@wdchaconpereira definitely sounds like your pressure switch. What vehicle do you have

    • @maniacslap1623
      @maniacslap1623 5 місяців тому

      This definitely sounded like the pressure switch.

    • @shannonprice525
      @shannonprice525 4 місяці тому

      Could be a pressure switch or could also be a clogged system or even a bad ac filter/drier

  • @SolomonX-ic3gr
    @SolomonX-ic3gr 3 місяці тому

    Where would ac switch be located in 2014 S550 Mercedes Benz. Will a bad switch cause the fan to run at top speed? Thanks

  • @Az56818
    @Az56818 5 місяців тому

    2011 highlander new compressor condenser expansion valve flushed charged to correct amount no leaks the AC runs fine above 1500 rpm but compressor and fans stop below 1500 rpm n ac light flashes

  • @saad2988
    @saad2988 2 місяці тому

    Wanted to know if the refrigerant will escape or not you are the boss thanks

  • @kaisonwworld
    @kaisonwworld 4 місяці тому

    I have a 2002 BMW e46 330ci I can’t find ac pressure switch?

  • @joe-pm3lb
    @joe-pm3lb 4 місяці тому

    on mine the low high switch ground out and was blowing the fuse like blow now

  • @Originalyardiesandy
    @Originalyardiesandy 2 місяці тому

    Hi there, I’m just checking out your channel. Good stuff. My AC is constantly running like if you’ve turn off the switch or turn off yeah if you turn off the switch, the AC is constantly running. It’s supposed to. It’s supposed to stop like time out, but it’s not doing that like my switch that’s supposed to stop accelerate or something like that it’s not working

    • @chuckhinson6793
      @chuckhinson6793 Місяць тому

      If it's a Ford the AC runs in defrost mode it mixes with the blend door

  • @diont7967
    @diont7967 4 місяці тому

    I need help locating the AC pressure Switch on a 2011 GMC terrain 4 cylinder. Any help would be greatly appreciated. Thank you

    • @stugrant01
      @stugrant01 3 місяці тому

      There would be two pressure switches, a low pressure switch (on the fat pipes) and a high pressure switch (on the skinny tubes).

  • @AVR.Kannan
    @AVR.Kannan 3 місяці тому

    Great explanation.
    Thanks.🎉.

  • @wesleyblake8552
    @wesleyblake8552 6 місяців тому

    Hi just asking for help with my aircon it has been to 2 aircon guys a new compressor put in and still wont work properly. At around 29 degrees the air flow cuts in half and so does the cold air , I have to turn it off and put on the through air on 4 fan speed and then the air speed comes back after 10 seconds I then put the aircon back on works fine again for about 5 minutes then it all happens again ....can someone help me please.

    • @allabouttravel1007
      @allabouttravel1007 4 місяці тому

      Wow mine does exactly the same thing , no idea why it's all been leak checked and refilled compressor is ok drive belt renewed,

  • @biglaw24
    @biglaw24 4 місяці тому

    Hands pissed me off. Couldn't finish the vid

    • @stugrant01
      @stugrant01 3 місяці тому

      You have OCD (obsessive compulsive disorder), which means that he isn't pissing you off, but rather you are pissing yourself off.

  • @TheUltimate65
    @TheUltimate65 4 місяці тому

    The AC system must be emty before the swith must be replemended

    • @shannonprice525
      @shannonprice525 4 місяці тому

      Only on vehicles with no check valve. I've replaced plenty of AC switches and as long as it had a check valve, I've replaced the switch without having to recover the Freon from the system

  • @hawkslayer2351
    @hawkslayer2351 5 місяців тому

    My ac blows fuses every time i turn it on is that a pressure switch

    • @shannonprice525
      @shannonprice525 4 місяці тому

      If it's blowing fuses every time your ac cuts on, that's a bad ac compressor. The ac clutch is causing the issue and cuts it off.

  • @juntong651
    @juntong651 4 місяці тому

    HI THE TRUCK 80% BLOW HOT AIR SO I REPLACE THE AC COMPRESSOR EXPNSEN VALVE AND ALSO THE PRESSORE SENSER , VACUM THE SYSTME AND RECHARGE THE FREON , BUT THA AC COMPRESSOR KEEP ON AND OFF FOR A MINUTE , DO YOU KNOW WHAT IS GOING ONG WITH SHIS AC SYSTEM

    • @MSGxBlueForce
      @MSGxBlueForce 4 місяці тому

      What about evaporator ??

    • @MSGxBlueForce
      @MSGxBlueForce 4 місяці тому

      When you turn AC on, look behind your “radiators” and see if the fans start running. (While car is running and on idle)

    • @juntong651
      @juntong651 3 місяці тому +1

      @@MSGxBlueForce Hello, the ac sometime work , sometime not , but when it work , it really cold , dddl
      Has code: lost communication with front HVAC / HVCF for 3 seconds or longer, 524025 31
      I been replaced AC COMPRESSOR /EXP VALVE /PRESSURE SENSOR VACUUM AC SYSTEM recharge the freon, it work one month and it happened again, can you tell what is going on with my truck , I did not replace the dryer filter , you think could be dryer problem? Truck is 2019 freightliner. Cascadia if you know anything, please let me know!🙏🙏🙏

    • @ronaldh2246
      @ronaldh2246 2 місяці тому

      @@juntong651you probably have a leak at one or all of your valves

  • @Shadow-qg6wc
    @Shadow-qg6wc 5 місяців тому

    Does a 2017 toyota Yaris ia only have one switch? I cant find any information on this and I only see one.

    • @kkenneth100
      @kkenneth100 5 місяців тому

      It could just have one. The low pressure switch usually cycles the compressor on and off but it's on the big line not the small.

    • @shannonprice525
      @shannonprice525 4 місяці тому

      There is two. The other switch is located inside your dash where the evaporator is located behind the firewall

  • @MrRohanstar
    @MrRohanstar 3 місяці тому

    Can u bypass it

    • @MechanicBase
      @MechanicBase  3 місяці тому

      That wouldn't be a good idea, TBH😉

  • @abdalqadr1
    @abdalqadr1 6 місяців тому

    Thanks

  • @thedronedudedenmark
    @thedronedudedenmark 3 місяці тому

    Great video 💪 Do You know where I Can switches in Mercedes ML320 2006 ?

  • @rayrodriguez3745
    @rayrodriguez3745 5 місяців тому

    Ac ac sensor on 2020 Chevy malibu???? Location???

  • @Ghost_png_
    @Ghost_png_ 4 місяці тому

    Appreciate your video. My only symptom is the display showing the ambient air temp is lower than it really is. Are there any other reasons that would cause it that’s not in the video ?

  • @michaelfulton6662
    @michaelfulton6662 5 місяців тому

    You talking too much dude

  • @wonders5596
    @wonders5596 6 місяців тому

    Very concise and mechanic genius video for DIY, thank you.