Quick questions on charging system.

[randomTruckKid]

I am finally getting around to charging the ac on my 79 c10. I put the 79 ac to the 84 cab and all that, it blows. I just need to wire the compressor back up.

But I need to ask, how much to put in? Do I need any oil? I was going to dump out and replace the oil in the compressor. Its a thin one for the serpentine kit.

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Also do I need oil in the rest of the system? The lines have all been disconnected for almost a year. And the system didnt have any charge when I bought the truck.
Its a 134a system.

 

[Edelbrock]

There will be some replies shortly.

 

[Ricko1966]

I am finally getting around to charging the ac on my 79 c10. I put the 79 ac to the 84 cab and all that, it blows. I just need to wire the compressor back up.

But I need to ask, how much to put in? Do I need any oil? I was going to dump out and replace the oil in the compressor. Its a thin one for the serpentine kit.

You must be registered for see images attach

Also do I need oil in the rest of the system? The lines have all been disconnected for almost a year. And the system didnt have any charge when I bought the truck.
Its a 134a system.

This is going to require math and research. I'd flush the system first. Then buy a new receiver drier( it gets replaced any time the system is opened) don't chang it yet. Change all the Orings to 134 Orings,charge the system up with 100lbs of compressed air,look for leaks everywhere with a spray bottle full of soap and water. No leaks good let the air out. Leaks? Fix the leaks.You need to look up oil and refrigerant specs for your truck,then we need to compensate for the different compressor and refrigerant type.You are going to need a vacuum pump and gauges. Look up quantities published for the year of AC you are using,post them so we can figure the differences. R134 will charge at a lesser amount than r12 and then the different compressor as well. Get the numbers we'll figure it out from there.Post pics of your compressor visible numbers preferably.

 

[randomTruckKid]

This is going to require math and research. I'd flush the system first. Then buy a new receiver drier( it gets replaced any time the system is opened) don't chang it yet. Change all the Orings to 134 Orings,charge the system up with 100lbs of compressed air,look for leaks everywhere with a spray bottle full of soap and water. No leaks good let the air out. Leaks? Fix the leaks.You need to look up oil and refrigerant specs for your truck,then we need to compensate for the different compressor and refrigerant type.You are going to need a vacuum pump and gauges. Look up quantities published for the year of AC you are using,post them so we can figure the differences. R134 will charge at a lesser amount than r12 and then the different compressor as well. Get the numbers we'll figure it out from there.Post pics of your compressor visible numbers preferably.

I dont think my system has a reciver drier

 

[Ricko1966]

I dont think my system has a reciver drier

Also known as an accumulator.

 

[randomTruckKid]

Also known as an accumulator.

Bruh. Mines like brand new

Anyway. On the googles it says 51oz refrigerant and 10oz net oil. Weather that is correct for my system? Idk

Im not shure if everything is empty of oil however.

 

[Ricko1966]

Bruh. Mines like brand new

Anyway. On the googles it says 51oz refrigerant and 10oz net oil. Weather that is correct for my system? Idk

Im not shure if everything is empty of oil however.

Okay the have a desiccant in them to absorb moisture from the system. When you expose them to atmospheric air for any length of time the absorb all the moisture that can from the air they are exposed to an then are used up. You said it was open for a year.

 

[Ricko1966]

Bruh. Mines like brand new

Anyway. On the googles it says 51oz refrigerant and 10oz net oil. Weather that is correct for my system? Idk

Im not shure if everything is empty of oil however.

Is that number quoted for r12?

 

[randomTruckKid]

Is that number quoted for r12?

Your net charge should be 3.2 lbs (~51 oz) of R134a (or about 4.25 12-oz cans), plus 10 oz of refrigerant oil (6 oz poured directly into the compressor suction port, the balance poured directly into the accumulator).

 

[75gmck25]

You will need to provide more information about exactly what you have, since it sounds like you may have parts from two different years.
To start:
1. Was it using R12/freon, or has ir been converted to R134a?
2. Take a picture of the compressor. It sounds like an R4.
3. If converted, what components and lubricants did they use? For example, PAG oil or Ester; stock orifice or swap from GM white to Ford Blue.

I also think you may have limited knowledge of working with A/C, since you thought you did not have a filter/drier, but it’s in the picture you posted.

It might be best to visit a shop and have them do it, but most have switched to R134a, since so few cars still have R12. Getting the vacuum pump and gauges to do your own work will add up, but gives you more flexibility.

 

[randomTruckKid]

You will need to provide more information about exactly what you have, since it sounds like you may have parts from two different years.
To start:
1. Was it using R12/freon, or has ir been converted to R134a?
2. Take a picture of the compressor. It sounds like an R4.
3. If converted, what components and lubricants did they use? For example, PAG oil or Ester; stock orifice or swap from GM white to Ford Blue.

I also think you may have limited knowledge of working with A/C, since you thought you did not have a filter/drier, but it’s in the picture you posted.

It might be best to visit a shop and have them do it, but most have switched to R134a, since so few cars still have R12. Getting the vacuum pump and gauges to do your own work will add up, but gives you more flexibility.

Its a r4, it's been converted to 134, said that alrety, no clue what oil was used.
Yes im inexperienced, I call the drier and accumulator, had never heard it called that before.
Alrety have alot of the stuff needed to charge and vacume it.

 

[Ricko1966]

Its a r4, it's been converted to 134, said that alrety, no clue what oil was used.
Yes im inexperienced, I call the drier and accumulator, had never heard it called that before.
Alrety have alot of the stuff needed to charge and vacume it.

Flush it pressure test it,change the accumuator,pull a vacuum let it sit for hours verify it holds vacuum for hours. Charge it 80 percent of the charge you googled then sneak up on it watching high and low side pressures compared to ambient temperature. Oil look up oil capacity for your original and replacement compressor use the difference to calculate system capacity vs. published system capacity for your air conditioning system..

 

[Ricko1966]

Vacuum pumps are cheap in my opinion,but you seem to be the DIY type so you can make a vacuum pump from an old refrigerator compressor.Just for fun you can mount the compressor on an old air compressor tank. Suction side is vacuum pump,pressure side is air compressor,put an automotive fuel filter in the suction line to keep trash out of the compressor

 

[randomTruckKid]

Vacuum pumps are cheap in my opinion,but you seem to be the DIY type so you can make a vacuum pump from an old refrigerator compressor.Just for fun you can mount the compressor on an old air compressor tank. Suction side is vacuum pump,pressure side is air compressor,put an automotive fuel filter in the suction line to keep trash out of the compressor

 

[Ricko1966]

If one of those are junk replace the compressor with a refridgerator compressor,use the discharge side as a compressor,the suction side as a vacuum pump. If those aren't junk don't tear one up,just use the refrigerator compressor as a vacuum pump.