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Tool Talk Discussion Forum

A/C Recharging

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James

10-31-2003 16:28:45




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This weekend we are going to fix the A/C in my 1988 Dodge Ram pick-up. I have a new expansion valve, accumulator and compressor to put on. The guy at the auto parts store gave me a can of oil to add to the compressor. The oil is in a compressed can just like the 134 refrigerant. What I need to know is what is the proper way to ad the oil? I am guessing that I add it directly to the compressor just like I do 134. Then turn the compressor over a few turns. Then what do I do with any excess oil or what is the proper procedure?
Thanks, James

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KeithF

11-03-2003 08:08:11




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 Re: A/C Recharging in reply to James, 10-31-2003 16:28:45  
I recently had a discussion with a long time air conditioning service man on this very subject. He said the R-12 oil will not mix with the R-134 gas and the result is that the oil will not be returning to the compressor and it eventually locks up. So, R-134 requires an oil that will mix with it. Also, anytime that the system is broken into for component replacement it must be pumped down with a vacuum pump . When the system is under vacuum it can also be checked for leaks by allowing it to set for an hour. Gauges will be required for this. Next, the proper charge of gas is usually on the label of the system. It will be in ounces most likely. This is important as putting too much gas in will overpressure the system and cause early compressor failure.

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bob

11-02-2003 18:31:34




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 Re: A/C Recharging in reply to James, 10-31-2003 16:28:45  
It sounds like you have all the parts you need so I would recommed you do the hard part work and then go to a place that advertises AC Service for $39.99 or so. Most quick lube places offer that and all they do is attach their AC machine and Recover what is left ( yes even an open system will have gas left), vacuum the system (demand they do it for at least 1 hour) and recharge it.

As far as the oil goes, when you take off the compreseor, and any other parts, drain the oil into a masuring cup you will never use in the kitchen again and add up all you take out. Add the same amount.

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Allan

11-01-2003 03:19:18




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 Re: A/C Recharging in reply to James, 10-31-2003 16:28:45  
Hi James,

A/C work is fairly easy, but you need the correct tools.

For what you are doing, you are going to need a charging station at the very least.

If you are replacing a defective compressor, the whole system will have to be flushed with an air conditioning flushing solvent first before you replace any parts. All that chewed up old iron is laying in your system and will ruin & plug your new parts and lines.

After you make all the necessary repairs, a vacuum has to be pulled on the system to remove any air and moisture. What I mean is, you can't just "fill the system" because the system will have air in it from being open to the atmosphere.

Moisture in an A/C system is contamination. It will freeze immediately when it hits the low side and plug things tight. Air in a system is a detriment because it will not allow you to sufficiently fill the system with refrigerant.

A/C systems lubricate by the oil circulating thru the system with the freon. You add the oil into the low side port in the same way you add the refrigerant.

Hope this helps,

Allan

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Craig

10-31-2003 18:21:31




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 Re: A/C Recharging in reply to James, 10-31-2003 16:28:45  
This A/C stuff can get pretty difficult, especially in your case. heres something from a website
----- ----- ----- ----- ----- ----- --
R12 oil (mineral oil) will not mix with R134a and be circulated through the air conditioning system for lubrication.
This has been remedied by using synthetic oil.
PAG (Polyalkylene Glycol) oil is used by all original equipment manufacturers and is harsh on seals and gaskets. Retrofit oil (Poyol Ester) oil is less harsh than PAG oil and can be used with R134a or R12 refrigerant. R134a refrigerant has smaller molecules and there for more prone to leakage.
This has been remedied by using hose with a barrier linning and better seals and gaskets. ----- ----- ----- ----- -----
make sure your can of oil says POE in it

if your oil can connects to a charging hose, make sure you have the can upside down while charging, unless the instructions state differently. the refrigerent cans should be charged in an upright position so you don't hydrolock the compressor.

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