4 SYMPTOMS OF A BAD AC PRESSURE SWITCH | How to tell if AC Pressure Switch is BAD

[@anthonywalters4420]

Clear, concise, and simple explanation of the system, the component and trouble shooting. Excellent video.

[@thatboiiraw]

Good video! My car is 2013 Hyundai Elantra GLS, currently at 125k. About a month ago it wasn’t blowing cold air so I decided to use one of this refrigerant cans and accidentally put to much in the system. Had to take it to a shop so they evacuated the whole system, changed the expansion valve and refilled it. It didn’t seem to work cause a/c was working but not getting cold air as it should. Now I’m having this issue with my RPM at idle when the A/C is on. It also have this little noise coming from the blower motor, but it only seems to happen when idling. Car runs smooth, but at red lights or stop signs RPM goes down and it becomes shaky and then this noise from the blower motor comes out (it only happens when a/c is on). Also replaced the throttle body, coils, spark plugs, MAP sensor, PCV valve because of this rough idle, and right now IDK what else to do with this. Dealer was asking for $550 for just a diagnosis and I don’t trust them anymore, so I’m running out of ideas

[@fixit3879]

oh wow. Thank you for sharing.

[@carleenderee4011]

It can also be the recirc actuator on passenger side of car deep in dash. It will have same symptoms & noise

[@MattH-zy9gp]

I would check all of the vacuum lines for leaks and to make sure they are connected to the proper component. That could cause the rough idle. Also check for any engine fault codes. For the AC, obviously check the freon pressure first. If that is good (not too low or too high) I would check the mixer motor. There is a small electric motor with plastic gears that mixes the hot and cold air depending on the temperature you set on the control panel. I have had to change out several of these. You might also check your cabin air filter. Leaves and twigs often fall into this area and can impede the blower motor. Hope this helps.

[@darwinmonzingo9738]

it's the ac compression switch and the ac pressure control valve the same thing just said differently? ty I'm trying to learn this my ac is blowing hot air and light is blinking on switch. I will check if clutch is engaged but I think it's not and could be the a/c control switch/valve unless there two different sensors 🙄

[@tailspindas]

2001 Chevy truck, jumped out the pressure switch 5 years ago, works great

[@codydonovan7356]

Jumped out?! I need help with my Tahoe

[@tailspindas]

@@codydonovan7356 disconnect the plug to the switch and put a paper clip on the 2 contacts in the plug..done

[@tailspindas]

@codydonovan7356 Watch the video it shows a switch jumped out...

[@fixit3879]

Wow, this is a great trick that works. Thank you for sharing.

[@wadefarris308]

My daughters 18 expedition Max's ac blows cold @ idle but slowly goes warm while driving.

[@ramirov8625]

Great video! I’m a chef, and this video helped me diagnose my ac issue-!!! But now, ac only blows to 60* before used to spit ice out of the vents, AC liquid is on point, not over charged or undercharged. I cleaned the condenser, but no luck. Any ideas?

[@fixit3879]

It's possible you AC Compressor may be going bad. I would also check for refrigerant leaks. Good luck.

[@natemorgan4665]

I drive a toyota probox with a 1nz engine and i have been having ac issues for the longest while now we change compressor, dryer filters etc but the only cool while idling but once start driving the warm air started.... any advice?

[@xaviawallen8295]

Same problem here with my 2nz

[@dmana3172]

I replaced everything, compresser, condenser, expansion valves and dryer. I recharged the system and still, the compresser sometimes engage and sometimes it doesn't. It just turn alittle, sometimes one second as I felt a vibration, then off for three seconds, then one second for vibration, then off. Now I'm lost. Please help me find out what is the problem. Now I know it can't be the compresser since it's brand new. I added oil in it. It's hard to turn the clutch after I checked to see why. I don't know if I added enough oil or if that could be the problem. My vehicle is Dodge Grand Caravan 2002, with rear AC. I put about half of 8oz. of oil into the low side hole in the compressor. I already got the old one out as much as I can before putting it in.

[@gigiesparza396]

I’m almost at a loss too. I replaced cabin filters. Blower motor. Did a recharge. Everything good and working. However I haven’t checked the ac sensor. I’m currently waiting for that part to come in. Maybe I can check back here and let you know.

[@dmana3172]

@@gigiesparza396 Just an update. I replaced the starter a month ago, and I forgot to disconnect the battery before doing that. So when I moved the wire, it sparked. The mechanic said that the two wires to the AC clutch was shorted, and they fixed it. Now it's running.

[@327JohnnySS]

​@@dmana3172, I replaced a ac compressor on a vehicle because when I put power to the compressor it would just spark. The magnet that engaged the clutch was shorted out and kept blowing fuses. The AC compressor has a free wheeling crank shaft that is a straight shaft. When there is power to the compressor the magnet draws the pulley to engage the shaft just like a standard transmission. If the pressure plate doesn't compress the the clutch to the power of the engine flywheel the transmission shaft will not turn. If your fuses are good most likely a faulty pressure switch that is not letting the clutch to engage. There are videos about how to test the switch. You can do that with a paper clip yet some vehicles have a 3 wire switch so you would have to get the information to know what two connections have to be jumped so you don't mess up the electrical component(s). Keep us updated on your search for ice cubes via dashboard

[@beyondsafe9958]

My Hyundai i 10 grant seems to dump the ac liquid. I say dump because we can find fluid stain anywhere. Any advice?

[@jessicahubbard8084]

AC blows hot air but every once in awhile it will get cool. Compresser is good and has freon in it. Not sure what it could be.

[@mike_0213]

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

[@lisasisk3713]

you'll have to by pass the AC/pressure switch, high or low first using a coated wire. There is a video on youtube: How to bypass the AC pressure switch using a paper clip. Something close to that. Just try the easiest to get to one first and move the other if that is not the one. Several videos on this topic. I was told twice; I needed a new compressor. I only have 121,000 on my car. It's hard to believe. I am going to try this. Shops don't want to replace small parts. They want to go for the jugler.

[@fixit3879]

Thank you for sharing.

[@LastTrump7]

@@fixit3879​​⁠2011 Ford Fiesta. Air conditioner has always been cold. I replaced the cabin air filter and since then the air condition blows cold as it use too but now fluctuates. Sometimes at a stop and even sometimes going down the highway at 60 mph. It can be 5-15 mins apart or longer?..

[@PedroVargas-ix1mm]

@@LastTrump7make sure they are installed properly with arrow up

[@PedroVargas-ix1mm]

@@LastTrump7make sure they are installed properly with arrow up

[@bajalal8977]

Ac compressor in my car is clicking 1-3 sec on and off when engine is on idling and it blows ambient/hot air. But when I am on highway speeds the ac blows cold. I have been to a mechanic who checked for leakage but there was no leak. He said that the compressor clutch is bad. Can it be bad compressor clutch or some faulty pressure sensor or is it normal operation? I have volvo v50 1.6 diesel.

[@chriss4365]

Not enough refrigerant. Probably has a slow leak in the schrader valves. Watch it when running if the clutch is going bad you'll see it slipping. The bearings in them do go bad too. Or is a weak magnet. They are not hard to change. Buy a hose and can of 134a from walmart and get the pressure on the low side around 35 with the ac running. when you check if it is less than 30 psi on low side when running you need refrigerant. I got videos on my channel about it might not be with your car but you can still learn about it. Look under the hood make sure you find out what refrigerant it uses before you buy anything.

[@bajalal8977]

@chriss4365 The mechanic I went to check for any leakage and none and the refrigant was also right amount. But if the compressor clutch is bad or weak magnet, wouldn't then the ac not work at all? In my case the ac seems to work when cruising on highway. What makes it work then? On highway speeds the engine rpm are around 2000 if that says anything.

[@chriss4365]

@bajalal8977 on highway you have more airflow. Does your radiator have electric fans?

[@bajalal8977]

@chriss4365 Yes it does have electric fan. Could it be the fan that is not working at idling and causing ac compressor to short cycle?

[@chriss4365]

@bajalal8977 it won't shut off the compressor, but it will make it not have cold air.

[@chugginbeers]

I put a new compressor in my car and when i ran the ac the compressor released all the pressure out of the bottom. Why would a new compressor do that?😢

[@fixit3879]

I can think of following possible reasons: Faulty Compressor: A new compressor could be defective, causing rapid loss of refrigerant or pressure. Improper Installation: If not installed correctly, leaks may occur due to loose fittings, improperly seated seals, or missing o-rings. Incorrect Oil Charge: Using the wrong type or insufficient amount of compressor oil can lead to internal issues. System Contamination: Debris, moisture, or old refrigerant oil in the AC system before installing the new compressor can damage components and cause leaks. Pressure Relief Valve Issue: Faulty or incorrectly set pressure relief valves may release refrigerant unnecessarily, leading to pressure loss. System Blockage: Blockages in parts like the expansion valve or receiver/dryer can cause excessive pressure buildup and release of refrigerant.

[@chugginbeers]

@fixit3879 ill start with the pressure valves, thanks so much

[@gabrielseaff487]

Excellent video and information. Thank you for sharing 👍🙏

[@fixit3879]

Thank you!

[@1awesomeface]

What if air ac and blower and heater is not working at all ?

[@fixit3879]

I would check the electrical fuse and then the wiring. Hope that helps. Good Luck!

[@tradmanmike3360]

New sub from the 641..Always thumbs up! Thank you!!!

[@fixit3879]

Thank you for sharing!

[@WiPri0371]

Mine is weird. The longer it's been sitting, the longer it takes to get cold at all. I mean, it will blow 70+ temp air until it gets to temp somewhere. No clue. The clutch turns but it doesn't get cold for 2-6 min straight. The interstate is 5min from my house. I can get all the way to the interstate and down it at least a mile before it will ever get cold. If I just drove it and let it sit for a few hours or so, it will take less time to cool down. It seems tho it takes longer if I haven't ran the AC when I drove it before.

[@fixit3879]

Your AC’s delayed cooling might be due to low refrigerant, needing a recharge, or issues with the compressor. It could also be caused by a faulty condenser or cooling fan. Good Luck.

[@yabasvlog3439]

Thanks for the information bro

[@fixit3879]

You are welcome. Glad you found it helpful.

[@TIIRONC5H]

How to know if my Compressor work or not bcz i Put ac on but Dosnt engage rotating it work hot or cold ?

[@fixit3879]

Try to see and look to the side of the AC compressor pulley. If the clutch engages and spins while the AC is on, then it usually means the compressor is engaging and working. Hope this helps.

[@ReynanteRealin-f1x]

Why My aux fan keeps running when i turn on my ac?

[@nevamind7686]

i hope this works if it does thank you so much

[@thekayzerbeatmaker]

My seat Leon 1.9 2007 does that clicking sound, and I have no ac... If thats the problem will change the pressure valve and come here to thank you! 🤙

[@fixit3879]

Hopefully that helps. Thank you for sharing.

[@adrianTNT]

I think that is a valve that mixes hot / cold air, probably even if you don't have AC.

[@dylanausman7274]

That sound they should in the video is a blend door actuator that wouldn’t be related to a pressure switch

[@emiliobanda1453]

My dodge charger 2015 5.7 hemi blows warm air when at idle or at stop and temperature even goes slightly above the half mark slightly over heats (slightly not over heating all the way) and then when I’m driving in the highway temperature is perfectly fine as well as the ac blows cold. Any ideas what it can be?

[@fixit3879]

Possibly bad AC pressure switch or temperature sensor. Good Luck!

[@alshvn870]

Did you figure this out? My car does the same but instead of heating up, it stays at 197 which is lower then normal

[@krsna333]

Some times my AC is not working when checked the cooling fan is not on/rotating. What need to be done?

[@HarleySLA]

Replace the fan motor

[@fixit3879]

Usually on modern cars you replace the whole AC Cooling Fan. Good Luck!

[@felixsanchez8284]

My 2006 duramax gets sluggish when ac is on, turn it off and regain acceleration. Still it blows cold air it just loses power and it looks like it takes longer to switch gears.

[@fixit3879]

Your Duramax might be sluggish with the AC on due to extra load on the engine or potential issues with fluids, filters, or the AC system itself. Check and top off all fluids, inspect and clean filters, and have the AC system checked. Good Luck.

[@felixsanchez8284]

@@fixit3879 fluids,? I have had coolant issues recently but it’s a long long long story, but please tell me how is it that this issue would affect the ac system. Still it pushes cold air when on.

[@jimleffler7976]

I'll check it out with your advice

[@fixit3879]

Hope it helps. Good luck. Thank you.

[@nathankaganac]

@@fixit3879so mine not working at all what could it be?

[@christhopherlasher2828]

Although I believe that I might have that problem too I have a different symptom ...when I Accelerate the air conditioner switches from Vent to defrost vents. And then back again once I reach the speed I was accelerating to..but now just stays on defrost vents no matter what.😂

[@fixit3879]

That's a mystery. May need to check AC Refrigerant pressure. Good Luck.

[@raygrant6210]

Blend door is your issue

[@naeemayub3682]

I have civic 2017 my ac compressor suddenly turn off and blown hot air .but I switched off and turn on ac the compressor start again and blown cold 🥶 air wht problem it will b ..some geraaj said its compressor problem but I'f compressor have problem then it could blown cold 🥶 air

[@fixit3879]

If your 2017 Civic’s AC compressor intermittently turns off and blows hot air, it could be due to a failing compressor clutch, low refrigerant levels, or electrical issues. Good Luck!

[@adrianTNT]

What could be if my AC blows cold air only if I rev the car past ~2000 RPM ? Also if I keep car in a cold location it blows cold air right away when starting, but if I kept it in hot sun, I need to rev it for a while until I can see some cold air.

[@ChristianGuerra101]

I have the same problem but I haven’t found the issue

[@adrianTNT]

@@ChristianGuerra101 I installed a new compressor, it is better but I feel like it is not at 100%. I suspect the filter/drier might be clogged. If you will have more info from yours, let me know 😬

[@cognac8297]

It's because the issue inside the car, Try again. Under the dash driver side unplug that heater /AC blend door actuator, And manually with your hand open it and shut it and mess with it for a minute plug it back in or leave it off for a minute to check things out. And put the blower knob on low not high, And or and open the glove box. Not under the glove box. But to the right side of it is another actuator unplug it and manually mess with it. Plug it back in or just leave it for a while to check things out. But I did this and it started blowing cold again . Like that. Idk why. It has something to do with under the dash. . but mine also if I stop it goes to 60* and when I go it goes to 40* and cycles again. But after messing with it like I told you. I can leave it on low and it cycles and works at stops . Idk why. I've been trying to figure it out for two years. I got this far a month ago. I've changed evap core and no leaks I've changed expansion valve nothing worked it's all the same it's something under the dash. And I'm annoyed with it. Mabye it's a pressure switch but when I run the fan on low and stuff it works properly so it can't be that. Idk why when the fans on low it works kinda more right doable. It mainly sits at ,50-49 now after messing with those actuators. And sometimes I move the heater AC knob back and forth . Once I turned the knob to heater and AC came thru. One I've turn AC on and heater came thru. That's the actuator under the dash maybe the heater core housing is messed up idk yet. . sometimes I kick the actuator under the driver dash gas pedal it kinda works better. Somthing to do with this area. Once a passenger got in and closed the door and it started working right . Could be the temp sensor on the actual evaporator. .

[@PedroVargas-ix1mm]

I have 2013 Tahoe when I have setting in middle or less ac blows. Cold and fine, when I crank it all the way up pressure builds high on low end and gets warm compressor shuts off

[@fixit3879]

Sounds like a possible AC Pressure switch problem. Good Luck!

[@thejaimster7520]

If my car is in the shade during the day or it’s night time the ac blows fresh-cold air, but if it’s under the sun it blows hot air

[@fixit3879]

It is possible it might be low on refrigerant. It might have a leak somewhere.

[@MrRohanstar]

2019 kona stops working ,no obd11 code ,

[@fixit3879]

Its hard to tell what the problem is without knowing more details. Thank you for sharing!

[@MrRohanstar]

@fixit3879 the compressor runs for 19seconds then shuts off,if i put 12 vokts to the fan it keeps runnning ,the fan relay was changed by some one along with the compressor and coolant temperature switch ,i addeb 1234yf but nothing changed i remove freon nothing changed

[@Robrt32]

I got 1 I can’t find an answer for. 98 Ford Ranger 3.0 5 speed. Idling or driving slow it’ll blow ice cubes. The faster you go the warmer it gets. It’s so so and 55mph, you won’t sweat but it isn’t cool enough. 70mph almost no cool air.

[@fixit3879]

Wow, very unusual. Possibly bad AC Pressure switch. You should also check to make sure it has enough refrigerant. Good Luck!

[@nicky6217]

My Ac stop send cold air when i put on speed 2 or higher, also something trough white smoke. Just on speed 1 works but when it's too hot is no enough for get cold enough. Any help really aprecciate Thanks

[@shojo8708]

I just saw the white smoke when I put my ac on and my car tried to stall while I was on the highway. I turned the ac off then no problems until I stopped at the supermarket by my place. Tried to restart the car to leave and it struggled.

[@fixit3879]

Sounds like it is possible your AC may have a leak, or be low on refrigerant. Good Luck.

[@CubanMofo]

Mine randomly stops cooling then if I restart the car it starts cooling again

[@mangkokhayon5039]

Same

[@CubanMofo]

@@mangkokhayon5039 today I filled the freon cause it was low and it started cooling real good . But then during the mid day heat it randomly stopped cooling while driving and blowing hot air. Now parked on my driveway in the evening for like an hour it's been cooling good non stop

[@fixit3879]

Does sound like possible AC pressure switch problem. Or you might just be low on refrigerant.

[@CubanMofo]

@@fixit3879 it was low and I topped it off. Now it cools really good when parked. But when I drive it cools but then randomly it starts smelling musky damp and starts blow regular air not cool. And if I would stop and start the car again. It would start cooling again

[@CubanMofo]

I wonder where's that switch.

[@ryancamilleri9473]

How can i find the wires on my car there are 4 wires but the switch 4 pins?

[@fixit3879]

You need a more advanced repair manual specific to your car. Sometimes they can be purchased on ebay for cheap. Or stop by your local CAR MODEL DEALERSHIP and ask the parts department for a diagram print out to help you out. They can print one out for free. Good Luck!

[@evanfox4597]

Mine is cold when parked or stopped and starts warm air when driving

[@fixit3879]

If your AC blows cold air when parked but warms up while driving, the issue might be a problem with the refrigerant level or airflow restrictions. Check the AC system for leaks or issues and make sure the vents and air filter are clean and unobstructed. Good Luck!

[@christhopherlasher2828]

I don't remember how many times I've heard the clicking noise in so many cars ...I thought that was a problem with the door actuators

[@fixit3879]

Right!? Me too. Thank you for the comment.

[@haydanarrias3031]

What about frozen ac lines?

[@fixit3879]

Sorry if it is missing it. Thank you for sharing.

[@dtaylor224]

I don’t have a check engine light on

[@fixit3879]

That's a good sign usually. Thank you for sharing.

[@marcosramos4596]

Is this a sign that mine is bad??

[@fixit3879]

It is possible that yes. Good Luck!

[@surveyheat]

Mercedes benz 202 ac compressor not on

[@fixit3879]

Thank you for sharing.

[@vicferrarisgarage]

Awesome

[@fixit3879]

Thank you!

[@isgood100t4]

You could do without the quick whoof sound effects between pics.

[@Down2hunt]

Woosh is good.

[@fixit3879]

We will follow your feedback moving forward. Thank you so much for sharing!

[@fixit3879]

So do we keep the "Whooof" swipe sound effect, or do we remove it? What do you guys really prefer? Thank you.

[@melrobinson6919]

​@@fixit3879Jeez, helpful videos and complainers gonna complain no matter what.

[@FRANCISQUAYE-l7j]

No engine lights but poor air flow

[@surveyheat]

Ac relay location

[@fixit3879]

Thank you.

[@K_Shea]

No, the last thing I want is another AI voice.

[@surveyheat]

Ac fun not working ac compressor not on

[@fixit3879]

That is very unusual. Good luck!

[@nicky6217]

@@fixit3879 My Ac stop send cold air when i put on speed 2 or higher, also something trough white smoke. Just on speed 1 works but when it's too hot is no enough for get cold enough. Any help really aprecciate Thanks

[@igotstoknow2]

AI voice videos are too annoying to watch.

[@fixit3879]

I thought this sounds better than my voice. Thank you for sharing your perspective.

[@lowlifespore8993]

In my car my AC keeps blowing at my feet and at the vents facing me. What could this be? It’s so annoying and makes my car harder to cool down😑

[@fixit3879]

If your AC blows at both your feet and the vents, it could be due to a faulty mode door actuator or incorrect climate control settings.