Hello,

Pretty new here.

I have replaced ALL of my a/c system. I have a factory service manual for this truck.

My question is: what is the best way to put the oil in the system? The manual shows what each componant in the system should have.

Any help will be appreciated!

Thanks,
BobbyS

 

How much oil is in the NEW compressor. It should say, somewhere.

It will disperse throughout the system once running.

 

The manual should say and your compressor should say if you look at the pic you will see it 240cc and the type of oil needed sp-15 or pag-100 same thing. Remember this is for my compressor check what your sticker says.

 

To start you should of measured it and pored it directly into the compressor then you inject the remaining needed oil with an oil charge.

I found this in my manual a table of needed oil for the A/C system

When I redid my compleat system I filled the compressor with the needed oil and then injected one 4 oz. oil charge and have never had any problems.

 

Thanks for all the replies.

There is no sticker on the new compressor and no oil in it.

Yeah my service manual says the same.

I still have the old compressor on the truck. I am removing it tomorrow. So I will drain it and see how much oil is in it and add the same amount in the new one? Then I should add some to equal the total amount that it calls for the entire system?

 

Hold on.

You said you replaced ALL of your system. Do you mean the evaporator, condenser, all the lines, receiver/dryer (accumulator) and compressor??? Everything?

If yes, you just have to add the amount listed under "system" in the chart. There wouldn't be any oil in the new parts.

If you only replaced some parts, it gets a bit trickier.

 

I don’t know what brand of compressor he purchased they may all have different oil needs.

This is my understanding find out what the compressor lists as needed oil then add what’s on the chart the rest of the oil needed for the total oil needed. I think you can be off an ounce or two with no problems. When I redid my system that’s how I did it oil needed for the compressor and oil for the system all I did was inject 4 oz. You will be better off being a bit low because the Freon will work better not being so saturated with oil.

When I say oil for the system all that means is this the oil will get distributed throughout the whole system so you need extra or you will not have the needed oil to keep the compressor running its just extra oil or think of the rest of the system as an oil reserve/tank.

The exact oil needed does not need to be perfect just within range is fine.

Better to be a little low than too much oil and kill the cooling performance of the Freon. Same with using any leak dye dont use any it kills the cooling performance of the Freon by 10%.

My understanding is the dye is old school the best is leak detection sniffers way better the dye will degrade the performance of the Freon but all shops will say it will not.

Remember the oil needed is what the compressor lists the oil is for the compressor that is only part that needs lubrication.

 

IF (big if) everything is new then he's starting with no oil. In that case you add the system amount. Nice and easy.

The compressor should be an OEM replacement. Anything else is inviting problems due to design differences. You really can't mix/match a/c parts.

 

The compressor took a dump and I was doing other work on the truck so I decided to replace the whole system.

Yes, I am replacing everything. Compressor, lines, evaporator, condenser, accumulator.

There is no oil in any of the new parts.

Maybe put some of the amount called for in the manual in the new parts?


Thanks,

 

That's the easiest.

Just put in the system amount. It will circulate with the freon and get to where it needs to go. No need to add oil to each part.