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How do i add r-134a to my system? also how do i identify the low pressure fill valve?

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THE LOW PRESSURE CAP IN ON THE LOW SIDE AC COMPRESSOR LINE (LARGER LINE) NEAR THE EVAPORATOR CORE INLET TO THE CAR.

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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My AC wasn't working so I thought I needed more freon but when I tried to fill it the gage was in the red. What's wrong with it?


On your gauge,is "red" high pressure or low pressure?
If you are seeing a high pressure on your low side connected gauge and the compressor is not running,that is a "full charge" or better stabilized in the system.If your compressor is not "kicking in" you may have a defective electrical component in the A/C system.With the engine running,you can jump 12v power the the compressor clutch momentarily just to see if it is working.Don't leave it jumped to long as the system is designed to cycle with pressure from the low side pressure switch which is the next place to check and the compressor can also be jumped at the low side switch.
If your "red" is low or no pressure,then you have a leak and repairs to the system to stop the leak will have to be made.You can add 134a at this time with the engine running and A/C requested,and as pressure rises in the A/C system,the compressor should "kick in" and cold air should start flowing in your dash vents.45 degrees at the dash vent airflow temp usually equals a full charge.
DO NOT add any aftermarket "134a" that shows an EXPLOSIVE label on it.These are not 134a and are usually butane and/or propane mixes that you MAY NOT want spraying on you in a collision/any situation where the A/C system has become ruptured/compromised.

Apr 23, 2017 | Cars & Trucks

1 Answer

I have a 2005 Suzuki Aerio. The AC is blowing out air, but it doesn't get cold.


You are most likely not getting any cold air because your A/C compressor is not engaging when you hit the switch. A number of different problems could give you this result.

First, you could have a blown fuse; that would be the cheapest and easiest solution. Second, your A/C system may be low on freon, and a low-pressure safety valve may be keeping the system from operating. However, rather than simply adding some freon to your system, it makes more sense to borrow a set of A/C pressure gauges and hook one up to the low side of your system (i.e., at the port where you would otherwise add R-134a refrigerant) to get an accurate pressure reading. A slightly low reading indicates that natural wear and tear on the system has let enough of the R-134a out of your system that it needs to be replaced. However, an inappropriately high or low reading not only indicates that you're low on freon, but also that there's a more substantial leak somewhere in your system. In this situation, adding refrigerant without addressing the leak may damage your compressor over time, as crucial lubricating oil drips out of the system and isn't replaced. A third and less likely cause for your problem is that the dashboard switch to turn on your A/C may be broken. This does happen, though if the switch is lighting up when you engage it, it's probably not the problem. Fourth, and most expensive, your A/C compressor may have failed. This would be somewhat unusual in a 2005 car, although it's not out of the question if you have used your A/C system a great deal.

Because of the cost of replacing damaged A/C components, it may make the most sense to let a certified shop handle any A/C system repairs once you have an idea of what's wrong. Full servicing of your system will evacuate all existing oil and refrigerant, identify and fix any leaks, and then vacuum test the system before filling it with fresh oil and R-134a. The end result will very likely work better and last longer than the cheap fix of dumping a can of R-134a into the system and hoping for the best.

A number of years ago, I lost all freon and pressure in my A/C system when a rock kicked up from the street hit the A/C cooling condenser and caused a pinhole leak. I couldn't find the leak; I only knew that my A/C system had lost pressure. That's the kind of problem that an A/C service center will be able to diagnose and fix much better than someone without the right equipment.

Jun 01, 2011 | 2003 Suzuki Aerio

1 Answer

Where do I charge r134 coolant? the adapter on can fits the high pressure valve and the low pressure valve is too big? please help..


can't be.the larger port is the HP side, and the hose on your can will only fit the low (small) pressure side-you CAN fill a system on the HP side, engine off, by hooking up to the HP side and inverting the can so that liquid 134a fills the high side-but it is not recommended if you do not have manifold gauges and aren't experienced with AC systems.

May 31, 2011 | 1998 Toyota Corolla

1 Answer

Cannot locate valve to add 134a refrigerant in a 2000 lincoln navigator


What your looking for is called a service port. On a 134a system there are two of them, located in the refrigerant lines. One port will be larger diameter than the other. The large one is the "high" side and the small one is the "low" side. refrigerent is added to the low side with the system running. You really should use a manifold gauge set to see what the pressures are before adding any refrigerant. If the system has too much, it is as bad as not enough.

Apr 26, 2011 | Lincoln Navigator Cars & Trucks

1 Answer

How do I fix a Air condition blow out hot air?


Go to your local auto parts purchase a a/c charge kit for about $69.00, find the low pressure(suction) fill port, there are two ports in every a/c system one is a low pressure side used primarily to fill a system with freon 123a or the like and it is the larger valve mounted on the line, then there is the dangerous high side valve, this is a smaller diameter valve mounted to a smaller diamet a/c line, this is under extreme pressure so donot attempt to fill this high side with freon as it can backfire on you and cause injury.
The low side fill kit will not fit on the high side port so thank godness for that.
start the vehicle put the a/c on full cold high blow fan speed, start filling the low side with a can of 123a freon+oil additive, which equals one pound of freon and check the inside a/c vents, getting cold? If its perfect then you are done, the system may have a very small slow leak and if it only takes a one pound can to fill it once or twice a year you are ok, if it takes more you may want to add a second pound can of freon 134a containing a dye additive that will work its way into the system and show you where the leaks are by exposing a color once it hits the air coming out of the systems defective seals etc.,also they sell a sealer + freon one pound can that can be used to try to fix the leak without having to get too expensive on the repairs.
A car's air conditioning system only hold like 2 3/4 pounds of freon, so in the event you happen to over fill the system a high pressure blow valve usually mounted on the a/c compressor will purge off the excess, but let me warn you they blow off without any warning and can startle you. Always think safety first, wear protective equipment. Work Smart, Work Safe.
Happy Motoring!!!

May 20, 2010 | 2002 Ford Escort

1 Answer

I need to retrofit and recharge my 1988 Dodge Ram Ac.


First, the old R-12 must be completely evacuated fromt the system. R-12 and R-134A do not mix and won't function together. Once you are sure there's no R-12 left in the system, you need to install an R-134A fill valve on the low side AC line. This is where your refill hose will connect to add R-134A. Once the valve is in place you're ready to fill the system. The compressor requires a minimum of 20psi to engage and should not be filled to more than 45psi.

RECHARGING AC SYSTEM

1.Turn the truck on and turn AC on HIGH
2.Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
3.Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
4.Insert the other end of the refill hose to the low side valve
5.Puncture the R-134A can with the screw on the refill hose
6.You should feel the system suction the refrigerant out of the can
7.Check for frost on the AC lines and the air blowing inside the truck
8.If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.

Jul 21, 2009 | Dodge Ram 150 Cars & Trucks

2 Answers

2003 dodge grand caravan ac recharge


you should be adding the 134a to the system the low pressure switch is doing its job by not allowing the compressor to kick on, it wont kick on until there is enough 134a in the system to be above the preset pressure for the low pressure switch.

Jun 27, 2009 | 2003 Dodge Grand Caravan AWD

2 Answers

How do I convert or fill 92 Jeep Cherokee air conditioning freon?


If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close .
134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold

Jun 20, 2009 | 1992 Jeep Cherokee Sport

1 Answer

Air conditioning system is not colling the car ? what do Ineed to do ?


i need to know how is not cooling the car?
is the fan blowing air or is the blowing air not cold?
it probably isnt cold.lets try that.
put a set of 134a ac gauges on the system and verify pressures.if it has low freon you may hear the compressor turning on and off.if so for sure its low and you will just need to add freon.
go get a 134a fron fill kit not the conversion kit.
and begin to fill untill the comp stays on and air is blowing cold.then stop filling and enjoy.
do not over fill as this will cause it to not cool again.

Jun 12, 2009 | 2002 Toyota Camry

1 Answer

Air Conditioning Low Pressure Line


The high pressure one is the closest to the A/C compressor. Therefore the one near the firewall would be the low pressure (behind the engine)

Why do u wanna know this since u can't fill it up urself?

Jun 19, 2008 | 1997 Plymouth Breeze

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