I now have an AC issue with my Explorer

[Klutch9]

In addition to a failing PTU, my 2016 Explorer has no AC. Went to test today, as it was quite warm outside… nothing. Compressor not turning. Checked fuses, all okay. Then I blipped the Schrader valve for the high and low side… completely flat. Thankfully, with the help of YouTube, I figured out where the leak was. Near the driver’s side muffler, there are two connections for the rear HVAC. They get corroded and leak. Sure enough, I see lots of corrosion and oil on the connections.

I’ve ordered new o-rings and gaskets for these, which were cheap. Assuming I can get them replaced, I know that I have to vacuum the system and then recharge. I’ll rent a vacuum pump and manifold gauges to do this. But, do I need to add more oil to the system? I’m not replacing any components, other than seals. I suppose it wouldn’t hurt to dribble a little into the line before I add refrigerant.

 

[Chris142]

A system that large can take extra oil with no issues..I would add a couple ounces.

 

[dnewton3]

Some of the refrigerate can choices will have oil already included.
Make 100% sure that if you choose to source your own, that you use a proper (compatible) lube.

 

[Capt W]

If you're opening the system to atmosphere (which you will be doing), replace the desiccant. Every time. Do the job correctly.

If you only have a bit of oil weepage (not leakage) at leaking joints, you needn't add oil. The systems are sensitive to over-oiling.

 

[Donald]

In addition to a failing PTU, my 2016 Explorer has no AC. Went to test today, as it was quite warm outside… nothing. Compressor not turning. Checked fuses, all okay. Then I blipped the Schrader valve for the high and low side… completely flat. Thankfully, with the help of YouTube, I figured out where the leak was. Near the driver’s side muffler, there are two connections for the rear HVAC. They get corroded and leak. Sure enough, I see lots of corrosion and oil on the connections.

I’ve ordered new o-rings and gaskets for these, which were cheap. Assuming I can get them replaced, I know that I have to vacuum the system and then recharge. I’ll rent a vacuum pump and manifold gauges to do this. But, do I need to add more oil to the system? I’m not replacing any components, other than seals. I suppose it wouldn’t hurt to dribble a little into the line before I add refrigerant.

You need to fill by weight, not by pressure. Before that need to pull a vacuum and see it's held for 30 minutes.

I think others would suggest replacing the orifice and accumulator.

 

[bdcardinal]

You need to fill by weight, not by pressure. Before that need to pull a vacuum and see it's held for 30 minutes.

I think others would suggest replacing the orifice and accumulator.

Those Explorers don't have an orifice, they use a TXV.