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#16
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Quote:
Last edited by tangofox007; 06-16-2008 at 05:29 PM. |
#17
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When I last took the test in 2005 it was an open-book mail-in test. It would take an actual effort to fail it.
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#18
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Since when does oreilly sell r-12?
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#19
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It is now be administered online. A ten year old could ace it in 45 minutes using the "find on page" function.
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#20
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I bought a can three weeks ago for $35.99. This was in the Azle, Texas store.
And the 609 is way too easy. Open-book test. I didn't study, I kept the test and book tab open, and just did a page search for the answers. Took perhaps 10-15 minutes to complete, and even had a temporary license to print out. Few days later I received the license card in the mail.
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1982 240D 1993 Mazda Miata LE 1991 Mazda MPV 1993 Volvo 940 Turbo Wagon |
#21
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#22
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Okay, so the overwhelming majority recommends sticking with R-12, that's what I'll do then.
I was looking into alternative refrigerants because I didn't think I would be able to get any R-12 or work with it, and just wanted to know if it was mechanically allowable (although not legally allowable) to top off the R-12 with another compatible refrigerant. I wasn't going to remove the existing R-12 from the system. If that's bad news for my AC system, that's what I wanted to know and I won't go that route. I don't have the gages/hoses for R-12, that's why I was looking at the Freeze-12 or Envirosafe kits with the hose and gauge (well, low side gauge anyway). I'll see if any R-12 gauges are in the tool rental program. Also, I'll look into this 609 certification, I didn't realize how easy it was to be certified. I'll admit, I don't know everything about automotive AC, but I understand the basics, and I used to have an old 4Runner that had been converted to 134a and had a leak that I'd top off every so often. So I probably know just enough to be dangerous. It will probably be a good idea to learn a little more. Thanks for the advice, -Geoff
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1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now |
#23
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Think about getting a manifold gauge set. That's the single most valuable tool that you can have for recharging the system, and it's not that expensive.
You need to be sure to get one with connections for R12 fittings. These are 1/4" SAE. The can tap you have should have a 1/4" fitting on it, and then will directly connect to the gauge set. |
#24
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Quote:
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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt. |
#25
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Have any of you guys recommending to stay away from enviro-safe got any reasons or facts you'd like to share? Or is this an opinion forum?
I like the enviro-safe on the basis that it is 1. Environmentally safe. 2. Can mix safely with R134 and R12 (although you're not allowed to mix it with R12). 3 Lower pressures. 4. Isn't corrosive in the presence of sulphur or whatever it is that makes acids when contacting water. The question is though, does it work as advertised? Does anyone here have experience with it? Or is it a case of "it looks and sounds like all the others so it must be like them"?
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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter 1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock. 1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles Last edited by pdrayton; 06-17-2008 at 12:42 PM. |
#26
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I've never recommended that you stay away from hydrocarbons, but let me address the concerns, if I may.
It is still not legal to mix hydrocarbons with 134a. The biggest concern with changing refrigerant types is the miscibility of the oil in the refrigerant. This is essential, and is one reason that you must flush the mineral oil out of the system when converting from R12 to 134a. The other reason is to remove the chlorine contamination because this is bad for the oil. It's not as bad for POE as it is for PAG, so POE tends to be the favored oil for these conversions. It is my understanding that hydrocarbon refrigerants are quite miscible with mineral oil and unaffected by chlorine contamination. Google returns a lot of information, some good and some garbage. But one thing you'll find is that Australians have been using hydrocarbon refrigerants for mobile applications for the past decade. If you do use hydrocarbons, I would recommend having your existing refrigerant reclaimed. Since it contains the valuable R12, it should not cost you much to have the work done at a shop. You will need to find a shop that has a refrigerant identifier, since they will be willing to work on it. If anyone has added hydrocarbons or sealers to the system, they will not want to hook it up to their system and you'll have to find someone else to discharge the refrigerant... I would further recommend charging into a hard vacuum, even though the makers of ES say that it isn't necessary. Just be sure to not overcharge the system; measure carefully what you put in. I use small cans (of 134a in my case) and weigh them first with the can tap on, then after I'm done putting it in so I know just how much I added with each can. |
#27
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Straight propane with a lubricant added makes a great refrigerant.
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#28
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An added benefit is that if you get stranded, you can use it to cook any roadkill that you find nearby.
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Bob '82 300D Petrol B-G Metallic |
#29
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Yeah, cause what are the odds of the evaporator developing a leak around a source of ignition like the brushes of the blower motor or a lit cigarette in the passenger cabin? Very low...so, most of the time you would be cool but in the event of a bad leak in the evap you might get real hot, real fast
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz |
#30
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Quote:
If someone were hurt as a result of my running hydrocarbons, I might open myself up to legal action. That's my biggest fear. As hydrocarbons gain acceptance, this risk goes down. The risk is undoubtedly very low already. I did briefly consider putting hydrocarbons in my factory 134a system once I had it discharged, but decided to stick with 134a for now. |
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