What is the average temperature of Freon in an automobile air conditioning system?

Posted on 2009-04-27
Last Modified: 2012-05-06
What is the average temperature of Freon in an automobile air conditioning system after it is compressed by the compressor? Also what is the average temperature of Freon before it reaches the evaporator. Thank you.
Question by:H3xploit
    LVL 2

    Expert Comment

    Hard to measure...not sure why anyone aside from a mechanic would need to know...and that mechanic SHOULD already know.

    So...the long and short is...don't go doing anything "Jackass III" with the knowledge.  It's cold in liquid form.  Cold enough to burn you, cold enough to give you frostbite.

    The more compression that's applied to the freon, the colder it gets.

    I realize this is not what you were looking for, however, any more information other than "How does an A/C system work" would, IMHO, be dangerous, given the pressures at which they function.

    LVL 34

    Accepted Solution

    As a person with air con / refrigeration installation & maintainence experience, I can confidently say there is no "AVERAGE" temperature of Freon.
    To many variables: air temp inside & out, compressor type & RPM, heat exchange radiator type, etc.
    Freon, by the way is no longer used.
    The refrigerant is measured by pressure not temperature.
    LVL 34

    Assisted Solution


    Expert Comment

    Freon is a brand name for refrigerant, kind of like calling all soda's Cokes !

    Refrigerant is measured in both temperature, pressure, and pounds per square inch gauge.

    The type of refrigerant in the system will be the determining factor as to the temperature of the refrigerant at various stages of the closed system.

    Before the Montreal Protocol was adopted, the refrigerant used in automobiles was R-12, now that it has been banned from production, the industry has turned to R-134A for automotive use.

    Please be aware that the high side pressure in an automobile can exceed 300 lbs psig and the potential for injury is prevalent...........


    Expert Comment

    drdave35, that was the most uninformative and unprofessional post I've ever read on Expert's Exchange. I can't believe you're allowed to post on here. If you can't answer the question, then move on, and don't even post. Giving a general warning is fine, but informing the individual that they shouldn't be messing with it is not your place, and your opinion on whether they should or not is 100% irrelevant. There's a reason any 'ole person can buy R134 at Wal-Mart.

    H3Xploit, my average temp out the vents in my Jeep Cherokee is about 32-42 (max/recirc vs norm) degrees using R134 (I converted from R12, using all the stock equipment). In order to measure the temps you're asking about, I imagine you could purchase an inexpensive wireless/remote thermometer and install the control unit inside the cab so you can read the temps on the fly. The sensor(s) can be strapped to any of the aluminum tubes, condenser, and evaporator, but be sure to add a little insulation around them so that ambient temps won't influence your reading.

    There is no cause for a safety warning, because with this method, you wouldn't be modifying or even tapping into any part of the system.
    Hope this helps! :o) Feel free to email me if you have any questions:

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