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Another A/C question 200 1990

posted by  someone claiming to be Teal 240 on  Wed Jun 5 18:39 CST 2013 [RELATED]

I am still on the fence about my 1990 wagon. the main concern in the keep/sell question is fixing the A/C. When I was getting the alignment done, I asked the mechanic how to test the old A/C system to see where the leak(s) are. He said he had r12 still, but would need to charge up the system and pressure test it for leaks, very expensive he said. Ok, what is a resonable way to test what issues the original r12 system to see what needs to be replaced? Thanks in advance, Greg








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    Another A/C question 200 1990

    posted by  Trev29 on  Thu Jun 6 05:04 CST 2013
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 17 05:56 CST 2014
    [RELATED]

    Get another mechanic or DIY.

    You can pressure test with an inert gas. Nitrogen is usually used. I use CO2.

    Even air can be used but the evacuation will take longer. Ie. Systems that have been open to the atmosphere are still recoverable.

    In Canada, there are R12 substitutes available off the shelf at Walmart (Duracool), Canadian Tire (Redtek).
    --
    1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.








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    Another A/C question 200 1990

    posted by  machine man on  Wed Jun 5 20:11 CST 2013
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    last visit: Wed Oct 22 15:40 CST 2014
    [RELATED]

    The system does not have to be filled up with any liquid refrigerant only the gas or vapor charge.

    Even then it does not have to be the R12 gas. Another gas can be used that is sensed by electronic testers or a simple propane torch with a copper plate strip is used for the other halogenated refrigerants.

    If you use a soap bubble soluition, preferably a thick mixture one that stays on the joint and allows the bubble to grow. Refrigeration supply stores carry small bottles of it for sale.

    You can use welding gases that are inert as they are usually very low in moisture content. Argon, nitrogen, and helium are just a few that can be used to pressurize a system.

    The system should also hold a vacuum (greater than 28 inches for cars, since they have rubber hoses) for at least thirty minutes. One has to allow plenty of time using this method as the leak (can) be very small relative to the size of the system.

    You always have to pull a good vacuum to remove all moisture and air before charging so do not buy into "it is expensive" to search for leaks. Sometimes it can be a flare joint fitting or o-ring fitting and you will see an oil film around it.

    It just takes an sincere effort to eliminate them!

    Phil








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    Another A/C question 200 1990

    posted by  james_a_sousa on  Wed Jun 5 20:10 CST 2013
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    last visit: Thu Oct 23 18:51 CST 2014
    [RELATED]

    I have read about doing a gross test using compressed air.

    I do not know any details.

    Search the site, search the FAQ, search the web???

    A quick search shows using nitrogen and a little refrigerant for reduced flammability.







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