Search found 318 matches

by Al9
Tue Sep 21, 2021 6:49 am
Forum: Automotive Air Conditioning Forum
Topic: My turn, need the wizards
Replies: 35
Views: 559

Re: My turn, need the wizards

I agree with what DetroitAC said about oil return. In GM POA-valve systems, for instance, as the POA throttles down, oil return is also throttled (reduced)...hence the reason for a separate oil-return line that bypasses the POA. The system in question doesn't have a POA, though, so the oil is carri...
by Al9
Sun Sep 19, 2021 2:03 am
Forum: Automotive Air Conditioning Forum
Topic: My turn, need the wizards
Replies: 35
Views: 559

Re: My turn, need the wizards

The fact that vents are cold means that refrigerant is actually flowing around and the evaporator isn't starved. So if there's an obstruction it's only a partial one. I believe a stuck closed TXV would drive LP into vacuum rather than just an abnormally low pressure. That said, the S6 lacks an oil s...
by Al9
Tue Sep 14, 2021 5:38 am
Forum: Automotive Flushing Forum
Topic: High side too high
Replies: 17
Views: 1039

Re: High side too high

I'm not sure why the oil in the condenser appeared milky To me it sounds like PAG got mixed with mineral and the rest of the mineral ended in the condenser, where things get pretty hot and solubility becomes critical. Stuff gets milky indeed when i treat my bicycle chain with PAG after having drenc...
by Al9
Tue Sep 14, 2021 5:05 am
Forum: Off Topic Chat
Topic: POE/Ester oil smell
Replies: 0
Views: 122

POE/Ester oil smell

Hi everyone. Have some "high performance" PAG 46 (lets follow Tim's advice :D ) left from my last compressor replacement, using it as bicycle chain lube to great effect (stays on even under the rain, pretty clean stuff, pleasant smell too) and noticed it smells earthy/chemical, somewhat li...
by Al9
Tue Sep 14, 2021 3:49 am
Forum: Automotive Air Conditioning Forum
Topic: A/C not cool enough, low charge / air in system?
Replies: 10
Views: 331

Re: A/C not cool enough, low charge / air in system?

TL:DR Yes, in certain conditions, and with some compressors, a low refrigerant charge can result in a higher than normal suction reading. Scroll compressors (also applies to vane and any rotary comp, generally speaking) are not so good at pulling suction down at slow rpms, that's why on many Euro/Ja...
by Al9
Sat Sep 11, 2021 7:17 am
Forum: Automotive Air Conditioning Forum
Topic: DEC or High-Performance oil?
Replies: 5
Views: 231

Re: DEC or High-Performance oil?

Cusser wrote: Fri Sep 10, 2021 8:53 pm However, in a sealed refrigeration system, not easy for moisture to get in, because such lack of seal would also let refrigerant out.
The thing is, double end capping seems to increase EP performance and even improve oil return. It's not all about the moisture.
by Al9
Sat Sep 11, 2021 6:53 am
Forum: Automotive Air Conditioning Forum
Topic: DEC or High-Performance oil?
Replies: 5
Views: 231

Re: DEC or High-Performance oil?

That i know, i'm aware of only two manufacturers of double end capped PAG. Not going to tell names here. Suffice to say one is Japanese, the other one is British (though part of a multi). And suffice to say, they have a different approach to end capping. One is symmetrical (same end groups), other i...
by Al9
Thu Sep 02, 2021 5:10 am
Forum: Automotive Air Conditioning Forum
Topic: What happens when capacity of system is exceeded?
Replies: 56
Views: 2805

Re: What happens when capacity of system is exceeded?

I don't agree that you NEED a cross charged head or bleed seat. You have a nice big fixed piston compressor, system charged head or cross charged would both work fine, whatever your existing valve head is will work fine. This compressor is incapable of low loads, oil return is not an issue. My faul...
by Al9
Tue Aug 31, 2021 4:55 am
Forum: Automotive Air Conditioning Forum
Topic: What happens when capacity of system is exceeded?
Replies: 56
Views: 2805

Re: What happens when capacity of system is exceeded?

He's also gonna need a cross charge or a nicked valve seat, or he'll be toasting his comp at part load if there isn't an oil return line or the TXV equalizer line isn't located between the EPR and the comp.
by Al9
Thu Aug 26, 2021 7:03 am
Forum: Automotive Air Conditioning Forum
Topic: Oil and gas mixed together?
Replies: 2
Views: 212

Re: Oil and gas mixed together?

Oil is mainly carried around by means of refrigerant velocity, that is, it basically gets pushed around as long as refrigerant is moving fast enough. Some of it dissolves in the refrigerant but most gets, again, pushed around. However, once refrigerant velocity drops low enough, be it due to low hea...