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Old 05-01-2009, 11:52 AM   #1
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Default A/C recharge question:

When removing parts of the A/C system and putting them back together, is it necessary to have the lines hooked up to a machine to remove air before filling them back up with 134a, or can you just seal up the system and pump the refrigerant in with the existing air in there?
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Old 05-01-2009, 11:56 AM   #2
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The proper way is to have a shop evac and recharge the system for you.
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Old 05-01-2009, 11:59 AM   #3
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I understand, but will it work without the evac?

BTW: Phil - have you got your new turbo yet?
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Old 05-01-2009, 12:09 PM   #4
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I understand, but will it work without the evac?

BTW: Phil - have you got your new turbo yet?

I doubt it, if it does probably not for long. You need to make sure there is NO dirt/contaminants at all in the system other wise it will kill parts. You also need to make sure the proper amount of oil is in the system. A shop shouldn't charge more than about $75 to evac and recharge it. You may also want to replace the drier if it exposed to air for too long.

They called me on Tuesday and said they were shipping it out that day. I'm hoping it shows up today so I can get my car running over the weekend. DD a V8 F-150 sucks.
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Old 05-01-2009, 12:10 PM   #5
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Not as well. You really will want them to evac the system. It would probably be a good idea to have them check the lubricating oil in the a/c compressor too. I didn't tip my compressor over or anything to cause it to lose the oil, but it was low, not that it takes a lot anyway.

*edit* Phil beat me to it, but the points are the same.
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Old 05-01-2009, 12:24 PM   #6
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K, Thanks guys. It's actually for my bro-in-law's car. I'll tell him to just take it in somewhere.
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Old 05-01-2009, 12:25 PM   #7
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On my 99 I pulled the lines off the compressor a few times. I've made sure that the oil was drained and then I charged it completely with oil first then freon second. Now, since I did not vacuum the system down there is surely moisture in the system that is not good for it; but it was all I could do at the time.

You can charge the system without evacuation first; but if you can do it right the first time... then go that route. You will have a much more effetive system and it will be bulletproof as it should be.

Cheers,
Prospero
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Old 05-01-2009, 12:57 PM   #8
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The reason you need to do a proper evac of the ac system, is to put a vacuum on the system, so that any moisture in the system will boil and be sucked out. Refrigerant mixed with water will create an acid that will corrode and eat the metal components from the inside out. Not a pretty picture.

Ron
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Old 05-01-2009, 01:01 PM   #9
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Quote:
Originally Posted by Alta_Racer View Post
The reason you need to do a proper evac of the ac system, is to put a vacuum on the system, so that any moisture in the system will boil and be sucked out. Refrigerant mixed with water will create an acid that will corrode and eat the metal components from the inside out. Not a pretty picture.

Ron
+1 A/C School 101
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