I replaced my Evaporator core and my receiver/dryer. A mechanic told me to pour 2 ozs of pag oil directly into the evap core and dryer but didn't tell me what tube to pour it in. The large tube on the evap core & dryer or the small tube? I did pour some into the small tube but it went no where, basically settling in the tube of the dryer. The tube of the dryer actually over flowed with oil a bit so I just dumped it out figuring I was doing some thing wrong. I also pored oil into the evao core which I capped after I filled it so the oil wouldn't spill out. The evap core is currently mounted in the truck again. My fear is that if I uncap it, the oil will drain back out given he angle that the evap core tube is on before I can get the a/c line hooked back on. What's the deal with that?

Thanks

 

When you vacuum the system down, chances are good the oil is going to get sucked out anyway....... When you refill, just use refrigerant that already has the oil in it. Or, if you pay a shop to do it, let them know what you did...... and they can take it from there.

 

I'm really trying to figure out how this should be done via the pouring oil method.

 

Good luck with that. Vacuuming the system is a required step for proper operation of the a/c system. It does indeed tend to suck out the oil as well.......

If you *really* want to try it that way, hook up the lower line to the evap core, pour the oil into the upper line.

 

Is the upper tube on the evaporator core the high side?

 

Don't think so. Should be pretty much the beginning of the low side.

 

Well I took the cap off of the evap core and since yesterday all the oil i put in the low tube of the evap core drained into the evap core so what now? I put 2oz in there. Is this a really big deal? Isn't oil going inside the core anyway? Why did the system need to be vacuumed anyway? It was a brand new part and sealed air tight in some sort of way.

 

Any time any part of the a/c system is open, it needs to be evacuated to suck out any moisture from air. If you add the oil and freon and there is moisture in the lines it can sludge up and your a/c wont work properly. Your lines had to be disconnected to replace those parts so it needs to be evacuated. Should evacuate, add 2oz of oil in the line with a a/c gauge and then add proper freon all through the low side with a a/c gauge.

 

Not to mention that having air in with your refrigerant can dramatically reduce the efficiency of your A/C.

 

Ok so it looks like im going to rent the vacuum pump and manifold from autozone. So your saying this pump will remove the oil from my entire system? Even the compressor? Does this mean I have to add oil back to the compressor also?
This guy ads all the oil before evac so what gives?