How to Find AC Leaks in Your Car (UV Dye)

hey guys chrisfix here today I'm going to show you how to find the leak in your air conditioning system in your car or truck so if you're not getting cold air and you're low on refrigerant I'm going to show you how to charge it up and check for a leak because it has to be leaking from somewhere in this case we're working on a 2008 toyota tacoma but this process works on pretty much any car out there so we're going to turn the fan on make sure the AC is on put the vent setting to the top vent and use a thermometer to get a baseline temperature reading the air coming out of here is 92 degrees Fahrenheit which is not cool at all so let's charge the AC system and find the leak the kit I'm using today has three main things you want to look for first you want to make sure it's the correct refrigerant you can see we're using r134a what you want to do is you want to look over here and you can see right here it says to use r134a if the sticker isn't located over here check on top of your hood a lot of times the sticker will be up there you can also check the back of the owners manual which a lot of times will tell you what refrigerant you have to use most new cars today use r134a next you want a kit with a built-in gauge this kit comes with the gauge and the nozzle attaches to the top which is exactly what you want so then you don't have to buy any special air-conditioning equipment this will plug right into your air conditioning system finally you want to kit with UV dye the UV dye is what's going to let us detect the air conditioning leak it's going to be visible using a UV light the good thing about this kit is it comes with a UV light to find the leaks with without the UV dye in it refrigerant is just clear gas so you won't be able to see where the leak is and as always I'll leave a link in description to where you can get this kit it's where I found it the cheapest to go check it out if you want to try it yourself when you're filling the system up with refrigerant make sure that you use glasses and make sure that you use gloves this stuff if it shoots out at you as chemicals in it it's freezing cold simple protection like this will prevent you from getting blind or getting frostbite before we get started let me give you the basics on how an air conditioning system works in a car or truck right down here is the compressor which is belt driven and compresses the refrigerant gas you can see the high pressure line coming out of the compressor and going up through here to the condenser you could get a better view of the condenser from under the front bumper it's this right here it looks like the radiator but it's actually the condenser the condenser works just like the radiator and it cools off the refrigerant which gets very hot since it's being compressed so it goes through the condenser cools down but still remains high-pressure and goes up through there comes across goes all the way across and into the cabin of the truck behind the firewall is a valve that makes the refrigerant go from high pressure to low pressure when the refrigerant goes from high pressure to low pressure it gets very cold and that cold refrigerant then moves through the evaporator which you could see on the screen is a mini radiator a fan blows over the evaporator and that's how you get cold air you can see the high pressure hose is narrow and it widens up here which makes it lower pressure so it goes through the evaporator comes out through the low pressure line follows it this way goes here here's the low pressure valve which we'll be using in a few minutes it goes down and then ends up going right back to the compressor where it gets pressurized again so basically the compressor pressurizes the refrigerant when the refrigerant changes from high pressure to low pressure it gets really cold and that's how you get your cold air all right so this is going to be really easy to do now that you understand the basics of how the system works we could easily just connect this to the low pressure end and begin normally when you're going to add refrigerant and there's no leak you want to pull a vacuum on the system so that there's no moisture but since we know there's a leak we're going to just use one of these cans not pull a vacuum and charge it up and then since this has the UV dye in it we'll go look for the dye with our pen after the system is all charged up and been running for a little bit okay so now we'll need to find our low pressure valve that we're going to connect to all you have to do is follow your AC system hoses and find the Schrader valve sometimes the Schrader valve caps are labeled L for low and H for high in this case you can see this valve is labeled H for high but our low pressure line isn't labeled L for low but you could also tell the low pressure line from the high pressure line because the low pressure line is thicker than the high pressure line also you can't really mess things up because the connector from the kit only fits on the low pressure line the high pressure line and low pressure line both have different sized Schrader valves now let's go start the engine and connect our bottle to the low pressure line so now we're going to start the car make sure the AC is on now we'll go to the engine apartment and I'll show you what we need to do so we're going to leave the fan running and you can see the temperature before now let's go add the refrigerant and you'll see how the temperature will drop so let's start the process of actually charging up the air conditioning system the engines running the AC is on you know your low-pressure port now you're going to get your can of refrigerant this nozzle right here you press back and slip over the end here so after we connect this you're going to press the trigger and then this will pop up to how much pressures in the system right now so you can see we press the trigger and it barely pops up but there's barely any refrigerant in this system so what you're going to do is you're going to hold the trigger down and let it charge as you're holding the trigger down turn it from the twelve to three o'clock positions constantly just like that and what that does that allows the oil and the the dye and the sealer and all that stuff to also get mixed in with the refrigerant and you're just going to keep doing this it could take up to ten minutes but this is all you need to do it's really simple so as you fill it check the gauge every 30 seconds or so you get the pressure reading when you let off the trigger and as you can see here it's in the green at about 32 psi so let's keep going a little bit more let's see how cold the air gut and you can see it dropped down to 61 degrees Fahrenheit which is good now let's check the pressure again and now it's just about 35 psi which is good enough to find the leak now we can remove the can and go look for leaks to look for leaks you'll need a dark place so they can easily see the UV dye with the UV light I would either wait till the Sun sets are going a dark garage before we go in the garage where it's dark and hard to see I want to give you an overview of the common spots where you're going to possibly find leaks so pretty much where you want to look now the most common places for leaks are down at the air conditioning compressor down in there where the two connections the high and low pressure lines feed in also you're going to be following these lines you see where these connectors are where this connector is there's potential for leaks usually there's no leaks in the actual hard line here but you want to check anyway it's worth it takes 10 seconds you follow the whole line with the UV light and you can see here right where it connects to the condenser there's an o-ring right in that little connector they typically go bad so you'll find the leaks in there and those are the good ones because then you just replace old rings you unbolt this you put a new o-ring and you bolt it up and you charge it up nice and simple cheap easy fix so that is a common problem area so then in the condenser which is behind the front of the grill this is also another common problem area the reason why is because you can see rocks and stuff kick up and hit that so you just want to make sure you look at all those places behind the grill if we look under the truck right here is our radiator so that's the coolant right there is the condenser so that's the air-conditioning refrigerant the other thing is here's another connector with one of those o-rings I was talking about that tends to leak so definitely check out right under there and then we're going to follow this line up comes up here you can see this is that high-pressure Schrader valve that we have check around there you can even open this up and check in there if you want follow it along check around this sensor want to make sure that there's no leaking around the sensor follow it along it keeps going goes up and they can check it right there where it goes into the cabin then you can follow that low pressure line out check right here check right in here and then follow the low pressure line you can see it goes down compressor and check over there so those are all the main points that you want to check if you have access right in here is the evaporator if you have easy access and you can't find any leaks there could be a leak in there it's a lot less likely still another potential possibility we're not going to check it out because the odds of that leaking are very slim and I have a feeling I know where the leak is coming from so let's go in the garage and check it out one thing I should mention is this truck has a substantial leak where the a/c is only cold for a day or two in this case we ran the truck for 30 minutes and that'll be long enough for the UV dye to leak out because you need enough time to actually have the UV dye leak out of the system so if you have a leak that lasts a few weeks two months before you stop getting cold air you might need to drive the car around for a few days to get enough UV dye leaking out so that you could actually see where the leak is that leak is probably going to be relatively small all right in the garage we're going to use our UV light came with the kit and we'll start at the compressor and work our way around the system so I could get a better angle if we go down in through the wheel well so this is the first area we want to look at this is the compressor so I don't see anything glowing up there's something so right down there you can see the glow that's right at the front of the compressor so that's where the compressor clutch meets the compressor and that's a seal that you can't service unless if you take the compressor out and rebuild the entire compressor so there's definitely a leak there so let's keep looking around we know that we have a compressor issue we'll go from under the wheel well back up to the top of the engine so we have our line that runs from the AC compressor goes up I haven't seen anything go up you don't really commonly see leaks on these pipes but worth to check anyway send it through and there's that connector I was talking about before with the o-ring the o-ring goes bad but in this case it looks good now we're going to go behind the grill you get a really good view down here there's that connector I was talking about before nothing leaked in there as we go across I do not see any leaks at all that looks good so now we're going to follow this line up you can see that line coming up here's the high-pressure Schrader valve take off the connection there and just look inside make sure that Schrader valve isn't leaking okay that looks good make sure you put the cap back on just keep following it is the high pressure line sensor you want to make sure you check all around that I don't see anything blown anywhere around that so that's good follow that high pressure line all the way to the wall right over here at the firewall I do not see any leaks at these connectors here which is good there's the high pressure right there is a low pressure will follow the low pressure line back check over here we're good at this connector then we're going to follow this down that connector down there looks good and then that goes into the compressor so that concludes our leak detecting with the UV light and the only leak we found was at the compressor we have a pretty big leak down there and it's very obvious which is good because sometimes leaks are hard to find so that's how you search for leaks yourself using refrigerant with UV dye in it hopefully this video is helpful was remember to give it a thumbs up also if you're not subscribed consider subscribing up on the screen are going to be other videos that are related to the air conditioning system you can click on the screen or you can find those video links in the description below again in the description is the link to the kit that I used that helped me fill the refrigerant and also find the leak and the top tip for this video is after you disconnect your adapter here there might be some pressure left in this line so you might get the UV dye spraying around a little bit that's why you wear your glasses if the UV dye sprays around here you might get false readings and think there's a leak somewhere you can see the UV dye sprayed there it sprayed there and some UV dye sprayed down on there so you might think that there's a leak there but in reality there's no leak it just got dirty so make sure you clean off the area before you go searching around with that UV light

Channel: ChrisFix

Views: 4,669,226

Keywords: Air Conditioning (Industry), a/c, no air conditioning, charger your air conditioning, carge your ac, car ac, How To Find and Repair AC Leaks, automotive air conditioning leak repair, Finding and fixing an A/C Leak, a/c troubleshooting, a/c recharge, a/c repair, a/c leak detection, uv dye, How to Repair a Vehicle A/C Leak with R134a, r134a, ac, air conditioning leak, air conditioning repair, How to Recharge Your Car AC, car ac repair, car ac leak, car ac leak detection

Id: pCv7rCdcXsc

Length: 13min 29sec (809 seconds)

Published: Fri Jul 03 2015