how to put refrigerant 134a in car
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  1. #1
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    how to put refrigerant 134a in car

    I have a 2000 Passat 1.8 T and the air is not cool ENOUGH for me...how do I add refrigerant? I'm a female, so please step by step instructions...thanks!

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  3. #2
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    Go to advance auto parts, they sell a kit for $30 or so. Comes with pretty easy instructions. http://shop.advanceautoparts.com/web...7CGRP2004A____

    I know it says $37 but i got mine last week for 30, worked great.

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    stop stop stop....

    these systems are meant to only output a certain temperature. the way freon works, you have to have a certain balance. buy that, i mean that there should only be ONE certain defined, specific ammount of freon in the system. period. no buts about it.

    there are two ways to check this for issues. the first is the complex method of getting gauges and checking pressures inside the system. this is the complex way, and does not guarantee colder, this just gets it back to the specific fill of freon that's required by spec.
    with the vehicle off, 134a freon has a certain volume/pressure relationship that is directly influenced by external temperature.
    -22f --- 0PSI
    -4f --- 4.4psi
    14F ---14.5 psi
    32F --- 27.5 psi
    50F --- 45 psi
    68F --- 68.2 psi
    86F ---97.2 psi
    104f---132 psi
    122F---177 psi

    and for some strange reason, the engineers at vw had a bit to much fun with this as the temperature chart goes up into about 160F with a psi of 293
    these are outside ambient temperature with the vehicle considered "cold" (sat more than an hour or two) where the pressure has equalized throughout the system, as nothing has been pumping it. i know they make small cheapo $10 gauges that pop onto the low side AC service port that can check this. if you're into buying tools, see if you can find one with numbers, because the ones i've seen typically has the colors-for-idiots designation of green or red with no specific labeling of what pressure is what. this chart is the absolute pressure that your system should be at for proper operation and maximum efficiency for best cooling, or basically at factory settings. these numbers come directly from VW out of the bently manual.


    now, the other method is much easier. here's how ANYONE can do it.
    first thing you do is get an A/C vent thermometer, set it in the central vent (right above radio) with the AC on full blast, vents only (not floor), and maximum cold. wait a while, then read the temp on the thermometer.

    this is the thermometer i'm talking about.

    i'm trying to find the temperature relation chart that depicts what it should put out at a given temperature, give me some time.

    NEVER fill your system if you think it isn't cooling right. you must diagnose it properly first, otherwise you can cause a problem, even if there wasn't one present.

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    Quote Originally Posted by bearlover0320 View Post
    I have a 2000 Passat 1.8 T and the air is not cool ENOUGH for me...how do I add refrigerant? I'm a female, so please step by step instructions...thanks!
    Actually, that's the wrong question. What you want to know is how to make sure the correct amount of refrigerant is in there. Too much is as bad as too little.

    The answer is (after you've tested for leaks) to evacuate the system to vacuum with a freon recovery machine. Then re-introduce a measured amount of refrigerant and lubricating oil. Not a home project. Aside from that, listen to Sipes.

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    what i was going to do....
    i have the refrigerant with the gauge...check to see whether the refrigerant is in the low, good, or dagerous (which i doubt since the car is 10 years old) then add the refrigerant until it is in the normal range...and i think i found the lines where i add it from my haynes manual..it's to the left of the battery with two lines, one being the heat, and one being the cold....

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    I think what these guys are saying, in a nutshell, is that our cars don't lend themselves well to the off-the-shelf DIY systems that would work fine in an '86 Buick.

    I've read and heard time and time again: Do not DIY the refrigerant in the Passat.

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    Quote Originally Posted by bearlover0320 View Post
    what i was going to do....
    i have the refrigerant with the gauge...check to see whether the refrigerant is in the low, good, or dagerous (which i doubt since the car is 10 years old) then add the refrigerant until it is in the normal range...and i think i found the lines where i add it from my haynes manual..it's to the left of the battery with two lines, one being the heat, and one being the cold....
    Hold in mind I'm not an A/C specialist; I've just been advised by one. Your proposed technique is not the right one for your car. Because of the way the A/C in the Passat is set up, a pressure gauge is not a reliable way to tell the level of coolant in the system. Going by pressure will almost always overfill; it's something about an imbalance between the two sides of the circuit.

    The local VW dealers here do the evacuate and reload, plus testing for leaks, cooling capacity, and electrical operation, for $89. Seems like a pretty good deal to me.

  9. #8
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    Quote Originally Posted by bearlover0320 View Post
    what i was going to do....
    i have the refrigerant with the gauge...check to see whether the refrigerant is in the low, good, or dagerous (which i doubt since the car is 10 years old) then add the refrigerant until it is in the normal range...and i think i found the lines where i add it from my haynes manual..it's to the left of the battery with two lines, one being the heat, and one being the cold....
    I have had great luck using the DIY kits to top off Passats that are a little low on R134A.
    I've done it many times over the years and have not had a problem. Just make sure the pressure is in the Good range and it should work. If it does not, then the system needs to be looked at by a qualified mechanic.

    Make sure the system is low before adding to it. The 2 ports on the system are the low-pressure and the high-pressure side. The DIY kit will only fit the low pressure side.

    I don't know why everyone is so opposed to people working on their cars. Sipes, I am sure you were at the garage days when we topped off everyone's A/C. Not one problem and we did a bunch of them.

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