Checking Pressures & Charging Automotive Air Conditioning 134A A/C

Checking Pressures & Charging Automotive Air Conditioning 134A A/C


hey guys today we’re going to show you how to test the pressures in your AC system and how to top up the system with freon if you’re low on freon so one thing you want to do is go purchase yourself set these gauges this will help you troubleshoot any problems with a system and also to adjust put put the right amount of freon into the system you don’t want to overcharge it with the 134a freon there’s two there’s a high side and a low side and you have two different sized fittings so it’s pretty much impossible to connect fittings to the wrong ones there’s a larger one and a smaller one the high side is the larger it’s going to be on the red hose and the low side always has a blue hose connected to it okay so when you connect up these hoses you’re going to want to look for a fitting that looks like this this particular one is the high side it’s coming off the back of the AC compressor so I’m going to connect your fitting you may lose a little friend when you do that as I did you want to make sure this valve is shut and to make sure all your valves on your manifold is shut and you want to make sure the yellow hose is connected and a loop like this so it comes out and had loose back in and there’s an area right here to connect it so you don’t lose any freon then you want to find your low side connector which on this car is right back here and you want to connect up your coupler make sure the Elvis shut also on that okay then what you want to do is start your vehicle Warhawk okay once your system has been running for a while going to do is to make sure both of your manifold bells are closed and you want to open your operation with Alex that’s going to let the pressure go to the gauge from both of these valves and make sure your recycling on take a look at the readings on your gauges disable I’m pressure engage on the wall aside psi is on the middle the black part of the gauge was right around 20 and running about 135 or so on the high side so this is a little bit low on freon you can also tell it’s low on freon because the compressor cycling on cycling off real short first like that so you know your laundry on okay now that we’ve got a reading off our gauges you want to look at a chart like this see what a normal pressure reading is if you don’t know the specific pressure your particular car supposed to be you can google it you could find a chair like this and on the left hand side here shows the ambient temperature and then we’ll show you the average high or low and low pressure gage readings you should be getting the normal system then there’s also a chart you should be able to find that helps you diagnose problems with the system say just you’re low on refrigerant you’re both gauges you’re high on low side are low and refrigerant you’re low on the low side high on the high side need service possibly a blockage cetera so this will help you diagnose your gage readings to charge up the system we want to connect up our yellow hose to refrigerant open the valve we’re going to open our low side valve on the manifold our wolf side fell that’s going to allow some prion passed from the Riyadh canister into the system see in the same classes as it’s April God will take a little grant sure your high site valve is closed here your high site valve and squirrel okay just edit Sabri onto the system 30 on the low and 60 and the high side that’s like you have a good chance you could damage your compressor okay so when you’re all done servicing your system you want to disconnect your gauges and make sure your service valves are closed on both of these the manifold bells closed and your your yellow hose is connected on both ends and then you can disconnect your couplers so losing any freon when these holes is flying all over the place


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