Search found 303 matches

by Al9
Sun Jul 04, 2021 4:28 am
Forum: Automotive Air Conditioning Forum
Topic: To Insulate vapor line or not
Replies: 5
Views: 229

Re: To Insulate vapor line or not

I believe TXVs are already tuned to provide optimal mass flow for proper oil return and improved evaporator pressure handling. Too much liquid ref returning to the comp may possibly hurt those delicate reed valves. Yes, AC has to run even in low heat load scenarios.
by Al9
Sun Jul 04, 2021 3:44 am
Forum: Automotive Air Conditioning Forum
Topic: AC not very cold at idle, great while driving
Replies: 63
Views: 1836

Re: AC not very cold at idle, great while driving

Couldn't reply earlier due to shift. Talked about the superheat (i should have said "refrigerant flow", actually, but evaporator superheat is still indicative of a certain amount of refrigerant flowing through the evaporator) stuff only to explain how a system with a seemingly feeble at id...
by Al9
Sat Jul 03, 2021 8:16 am
Forum: Automotive Air Conditioning Forum
Topic: AC not very cold at idle, great while driving
Replies: 63
Views: 1836

Re: AC not very cold at idle, great while driving

That's a relief. If compressors don't do much at idle, how to -good- ACs stay cold when stuck in traffic? Could my belt be slipping, but not making noise? Talking about small Jap cars, Scion Xa and the like. The Scion Xa runs a tiny 90cc max displacement clutchless comp, others run equally tiny scr...
by Al9
Fri Jul 02, 2021 7:14 am
Forum: Automotive Air Conditioning Forum
Topic: AC not very cold at idle, great while driving
Replies: 63
Views: 1836

Re: AC not very cold at idle, great while driving

Ok, if it has been charged by weight you probably have a faulty compressor control valve then. I'll let Tim suggest a possible replacement. Still sounds like low displacement operation rather than condensing issues, to me. Apart from any possible hissing, are you getting any strange robotic/motorboa...
by Al9
Fri Jul 02, 2021 4:09 am
Forum: Off Topic Chat
Topic: Live evap but no air blowing, parallel evaps in coach HVAC
Replies: 3
Views: 6692

Re: Live evap but no air blowing, parallel evaps in coach HVAC

but a "turned off" evaporator with no airflow and a functioning TXV will be an oil separator. There will be a very tiny flow of refrigerant and oil into the evap and it's suction line, and not enough flow to move it back to the compressor with suction gas velocity DetroitAC, just saw your...
by Al9
Fri Jul 02, 2021 3:03 am
Forum: Automotive Air Conditioning Procedures, Tips and FAQ.
Topic: Grayish Powder Inside High Pressure Line
Replies: 25
Views: 1128

Re: Grayish Powder Inside High Pressure Line

Sure the OEM TXV is the correct one (i.e. same 447500-XXXX codes if Denso)? They can have really different control properties according to the compressor, evaporator and engine combo they're meant for.
by Al9
Fri Jul 02, 2021 2:48 am
Forum: Automotive Air Conditioning Forum
Topic: AC not very cold at idle, great while driving
Replies: 63
Views: 1836

Re: AC not very cold at idle, great while driving

Sure that it's properly charged (talking about recovered charge weight, NEVER pressures, especially with a clutchless variable displacement compressor)? Water will ALWAYS cool a condenser better than air. To me, it sounds like the system is deliberately keeping a low displacement for some reason, an...
by Al9
Thu Jul 01, 2021 4:10 pm
Forum: Automotive Air Conditioning Forum
Topic: 1. Receiver Drier 2. Corrosion
Replies: 13
Views: 440

Re: 1. Receiver Drier 2. Corrosion

At the very least you'd want to flush the entire AC loop and replace all the oil if you waited that long (might be double end capped PAG, but it will still absorb water and lose lubricity over time).

Unfortunately, AC needs some real attention.
by Al9
Sun Jun 27, 2021 4:22 am
Forum: Automotive Air Conditioning Forum
Topic: Low side normal /high side low stumped
Replies: 82
Views: 2386

Re: Low side normal /high side low stumped

I'd like to see way colder stuff than 60 from the rear system.
by Al9
Sat Jun 26, 2021 3:32 pm
Forum: Automotive Air Conditioning Procedures, Tips and FAQ.
Topic: Grayish Powder Inside High Pressure Line
Replies: 25
Views: 1128

Re: Grayish Powder Inside High Pressure Line

If they give you the deer in the headlights look try asking them for "moisture resistant" PAG 46 oil. If they still don't have a clue or start fiddling around with Ester or PAO stuff then go elsewhere. You can reuse old TXVs. In fact i'm using a second hand TGK TXV removed from a second ha...