Hi,

I have an 1985 f150 with factory air that has been converted from R12 to R134a. I had a coolant leak because of a hole in my evaporator. I just replaced the evaporator and accumulator because it was old. I then flushed the condensor and some of the lines. I am now closing the system back up and getting ready to vacuum and charge the system. My question is whether or not I need to add PAG / Ester oil or not ?

Some folks have said that I dont because most oil in in the compressor and because I did not replace that I do not need to add any ? IS that right or do I still need to add some oil.

Thanks for all your help

 

Most DIY 134A refrigerant cans include the PAG oil in the can.
Commercial 134A (30lb. tanks used with a gauge set) require PAG oil.

 

What type of compressor do you have? I would definitely add oil, but how much and what type is the question.

Most retro-fits amateurs do use ester oil. Most systems that came from the factory with 134a use PAG oil.

Different types of compressors retain different amounts of oil.

 

I am pretty sure I have an fs6 which I think

is stock on this truck. What do you think :








I don't see a model number or part number

 

I think you are correct.

All I can find is the total system capacity for oil is 10 ounces. They say Ford never specified how much the compressor holds, so you have to take it off and drain it into a container and measure it.

 

Is it likely that much of the oil remains in the system because the compressor was never removed so I am probably fine ?

 

Since you didn't do the conversion, you do not know how much oil they used or what type. I believe you have two choices;

Just run it and try it like you are leaning toward doing or;

Clean anything out that you have not already, and then put 10 ounces of your oil of choice, either ester or PAG.

 

you make a good point. Honestly I am not leaning either way I just want to do it right. How hard is it to remove the compressor and drain the oil ? DO you maybe have a link to walkthrough

 

The system is empty correct? Just take the compressor off and turn it over so the holes where the fittings are will drain out. Steal a measuring cup from the kitchen and make it yours so you can measure the oz of oil.

 

Do I have to remove the hoses for the oils to drain out or will the oil just drain out

 

I would remove the hose asm so the drain has air feed to drain....kinda like a gas can vent.
"Physics"