how do I charge my a/c on 92 Corolla??

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Mar 29, 2005
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I saw 2 valves under the hood, one was red, and the other black, but I don't know which to connect my a/c recharge hose to??? I'm pretty sure I also have to get special valves to charge it, as my hoses end fitting is too big to fit either line. Any help is much appreciated :)
 

Stanley Rockafeller

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i'm using the RedTek stuff that's available up here in canada. Anyone can buy this stuff, and it's propane based. On my 97 Escort, it worked remarkably well! the cooling efficiency on it was better than on the Cadillac STS's and DTS's we rented!
 
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First of all you need to convert the fittings using screw on adapters to convert them to an R134A Quick Connect style system. You always want to charge from the Black or Blue "Low" pressure side port... It charges better/quicker if you submerge the can of stuff in hot water as this will cause it to boil and expand out of the can into your system. You also want to put your A/C on MAX A/C and high fan setting inside the car with all the windows down so it puts the system under the highest loading possible. If your system is completely empty you will have to vacuum it out first. If it still has some in there you can top it up without vacuuming it. Also make sure that your top-up stuff is compatible with R12. If not DO NOT use it under any circumstances! PM me if you need more help, my dad has an A/C license and I'm pretty good with this stuff because I have learned from him. Good Luck!
 
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NEVER EVER put those bottles in hot water, you can harm yourself doing this kind of work. For some one with little or no experiance to do that is asking for trouble! This is not an area to guess or experiment in, please! My exeperiance comes from 31 years in the HVAC business, not to discount others experiance here.
 
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 Originally Posted By: duaneb9729
NEVER EVER put those bottles in hot water, you can harm yourself doing this kind of work. For some one with little or no experiance to do that is asking for trouble! This is not an area to guess or experiment in, please! My exeperiance comes from 31 years in the HVAC business, not to discount others experiance here.
My dad has been doing this for 35 years with R12, R22, 134 and has had 0 problems... Even with the 20 lb cylinders... Not boiling water, but hot water to warm to help the liquid under pressure turn into a gaseous state easier upon leaving the cylinder.
 
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That is your dads choice, its a very very unsafe pratice. Is the few dollars one would lose by not getting out the last half oz, worth losing your life, your hand, your eye or worse yet harm some person just watching from afar?
 
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Invert the can. All refrigerants boil at incredibly low temps. I guess using a warming agent (your hand should work) will expand the last few drops into taking up more space ..pushing more into the system. Water was taught "back in the day" at automotive ac skewl. You would even use a scale. But I'm sure someone blew themselves up and did the T-1000 frostbite thing and revolutionized the industry from a procedural standpoint.
 
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It sounds like the R-12 mineral oil in the system is OK according to the mfr., if that's what is still in there. It should still be pulled down to vaccum before a recharge though, unless this refrigerant was already in there before and it has not had a total pressure loss. Besides any possible issues from mixing refrigerant it will also allow accurate charging by weight, which likely needs to be done as it sounds like only 1/3 the former R-12 capacity is the proper charge.
 
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I know a guy who burt an IH fatm tractor to a crisp not knowing some dumb *ss used propane rather than retrofit it for R-134a, or just pay the price for the R-12. For a year of so when the R-12 to R-134a thing was going on I worked for a Thermoking dealer, the lengths people would go to to avoid a conversion was astounding and stupid. Should be a law against doing that, and if some poor guy working on your car gets burnt I think it would make a great case for reckless endangerment and as I recall in Canada that can carry a life in prison penalty. Retrofilt the car for R-134a, from the sounds of things the life you save could be youe own!
 
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You should convert it to R134A. First, have all of the R12 evacuated. Second, replace the receiver/drier. Third, drain out as much oil as possible. Fourth, flush the system with A/C system flush solvent. Fifth, pull a vacuum for 45 minutes, then charge with 85% of the original capacity with R134A.
 
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Kinda reminds me of when my pal decided to make acetylene bombs out of a gallon plastic jar. He put the torch to it (obviously not lit) through a hole in the lid ..and taped the lid where he put the fuse through to the interior. He put just a little too much volume in the jar. He bent over to light it ...and in a flash (we much have blinked), he was just standing there looking like Wiley Coyote after he lit a bomb and incinerated himself. Sorta like this ..but with an expression like this The shock wave/concussion was what really shook him up.
 

hal

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 Originally Posted By: The Critic
You should convert it to R134A. First, have all of the R12 evacuated. Second, replace the receiver/drier. Third, drain out as much oil as possible. Fourth, flush the system with A/C system flush solvent. Fifth, pull a vacuum for 45 minutes, then charge with 85% of the original capacity with R134A.
That there, is exactly what you should do. Works great on any older system! My dad has access to this equipment at his work and I have done it on several cars. It is not very expensive to do otherwise. You can reclaim the old freon, install the retrofit kit/dryer yourself and then just have the system vacuumed/recharged for a pretty low price.
 
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Filling with cans often shows ice forming on them. Warming them helps filling considerably. Just getting them to ambient temp or a little more will helps a lot.
 
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My first two cans i usually dip in warm water it helps feed it in without needing to run the comp, being low on freon at the benning of a charge(freon carries oil no/low oil= not good)i don't like running the comp. untill i have too.
 
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 Originally Posted By: The Critic
You should convert it to R134A. First, have all of the R12 evacuated. Second, replace the receiver/drier. Third, drain out as much oil as possible. Fourth, flush the system with A/C system flush solvent. Fifth, pull a vacuum for 45 minutes, then charge with 85% of the original capacity with R134A.
Forgot to add that you should refill with the correct amount of ESTER oil.
 
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