Search found 321 matches

by Al9
Thu Oct 21, 2021 8:19 am
Forum: Automotive Air Conditioning Forum
Topic: 1984 corvette r12 parked for 15 years
Replies: 3
Views: 184

Re: 1984 corvette r12 parked for 15 years

At the very least the shaft seal is shot and the condenser is rotted, along with plenty of o-rings.

New compressor, some serious leak checking ahead, i'd convert to R-134A since a new condenser will be likely needed.
by Al9
Wed Oct 06, 2021 2:59 am
Forum: Automotive Air Conditioning Forum
Topic: 2007 Yukon Denali – no air flow – freezing but not low on charge?
Replies: 23
Views: 979

Re: 2007 Yukon Denali – no air flow – freezing but not low on charge?

Low side pressure switch on your accumulator is bad-- it should cycle off the compressor at about 22 psi and back on at about 28 psi or so. I am concerned of lack of oil return when you run below 10-15 psi. I used to test continuous run (stuck shut cycling switches) compressors- and the front beari...
by Al9
Sun Sep 26, 2021 9:01 am
Forum: Automotive Air Conditioning Forum
Topic: Mechanic Mixed PAG with POE...
Replies: 5
Views: 391

Re: Mechanic Mixed PAG with POE...

I wouldn't worry that much. In fact, most UV dyes use, you know what, Ester oil as a carrier. If all he did was add some dye to the system, that's fine. Shops are refusing to flush your system simply because they haven't got a clue about how proper flushing is carried out. You have to be thankful th...
by Al9
Tue Sep 21, 2021 6:49 am
Forum: Automotive Air Conditioning Forum
Topic: My turn, need the wizards
Replies: 35
Views: 1692

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: 1692

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: 1783

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: 280

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: 752

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: 448

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: 448

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...