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Low side AC hose pinches when pulling a vacuum...


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jellis56
User

Nov 4, 2021, 3:43 PM

Post #1 of 18 (550 views)
Low side AC hose pinches when pulling a vacuum... Sign In

Just received a new low side suction hose (GM GENUINE 1522310). When installing it I noticed it felt soft and very flexible. When pulling a vacuum it pinched the two hoses on both sides of the muffler. This is very odd, never seen this before.

In looking at the picture of the hose online, it shows letters on the hose and when I looked over the hose I see no markings at all, no rating. Link deleted ............... not allowed
Can someone tell me if this is something they've seen before or ?

thanks

2014 Silverado 1500 5.3L


(This post was edited by Hammer Time on Nov 6, 2021, 3:48 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 4, 2021, 4:07 PM

Post #2 of 18 (546 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Say WHAT! Something is all wrong A/C hoses do NOT collapse under vacuum. Plain heater type hose might would never be used.
A large on-line outlet like mentioned might have made a mistake, making their own somehow the wrong hose was used. It should be barrier hose rated for both vacuum, pressure and not leak 134a thru the "rubber" if you call it that.


Essentially you shouldn't see a thing pulling a vacuum just gauge or gauges telling you that you've reached a full vacuum.
IDK, send those back or whatever they do you need real ones. If pricey where you are get them at a reputable parts store and just pinch them yourself by hand should be quite rigid or don't take them. Never heard of this, you're a first!


T



jellis56
User

Nov 4, 2021, 4:10 PM

Post #3 of 18 (542 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Its a Genuine GM part I purchased off of Rock Auto. The label on the hose says Made in Mexico and has an ACDelco label on it... i have no idea what the hose is made for, there is no identifying rating or anything...


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 4, 2021, 4:20 PM

Post #4 of 18 (530 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Genuine or not it just not right. Try another that one is some mistake even if all markings are correct. Hacked, copied or honest mistake? Most hose has ratings printed on it what it's rated for.


A/C clearly has to hold a LOT of pressure either side AND hold a full vacuum which BTW is just 14.7 PSI +/- fractions of that of pressure pushing against a vacuum at sea level normal (varied by the hour) average.
I don't happen to use that outlet but think you could just show them what you see and any parts person should know it's all wrong there may be a lot of them to remove from their inventory??
Don't use it even if you could charge this back up you asking for a blow-out IMO if it can collapse try the pressure side of working systems even the moments when it's off after running,


T



jellis56
User

Nov 4, 2021, 4:26 PM

Post #5 of 18 (528 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Yeah, I still have the old hose which I have run a flush through awhile back but I have heard don't do a flush with ac hose that has mufflers.

when I pulled a vacuum on system in the past I vacuum all the way down to 30. which is lowest on my low side gauge.

when I feel the hose with the vacuum on it, it seems like it is pinched in the middle of the hose lengthwise and both edges running inside the length of the hose aren't completely flattened.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 4, 2021, 5:02 PM

Post #6 of 18 (521 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Right on the muffler and flush not out of those would spoil the show.
Again, this hose isn't like garden hose nor heater hose sold by the foot. I don't make hoses or have the crimper machine/tools to do so but I'm sure if a hose fit in the machine that was all wrong would still make the parts look like the right parts.
It plain can't be right.
You are correct that you see 30 pulling a vacuum is "Hg" or inches of mercury in a vacuum tube "mercury" is a liquid heavy metal thermometers used to use is why for measuring barometric pressure was handy too.


World (all places put to the average) is 29.92 @ sea level. Deduct about 1 Hg per 1,000 ft. of elevation if applicable is that norm.


Layman's speak - AIR HAS WEIGHT TO IT! :-)


Hose can't collapse it would if using water hold out that pressure if you went deeper anything would collapse.
Back to the point is IT HAS TO BE WRONG so those have to go for good ones,


Tom



jellis56
User

Nov 5, 2021, 9:33 AM

Post #7 of 18 (490 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Tom,

I pulled the ac hose off and did find hose info which is not that legible but am able to make out it says the following:

R134A/R123yf other info is faded. Looking at the hose material it's a nylon based covering or not the typical hard rubber I see on other ac hoses, or whatever the outer material is. I did see someone on YouTube showing an ac hose they cut open and the inner tube was collapsed. I'm wondering if this is what was sent to me... i emailed the company and asked them to not send me one with the wrong hose..

I'm wondering if the new AC hoses are different now and this is what I got? Is it right for them to be collapsing pinching off the hose when pulling a vacuum? I don't think so, do you?

The more I look at this I think it may have been a used part they sent to me, judging by the dirty part label that was stuck on it at ACDelco. I got it from Rock Auto.


jellis56
User

Nov 5, 2021, 9:44 AM

Post #8 of 18 (485 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Further research online tells me it's nylon inner hose with fiber braided on the outside.

So that makes me wonder if the hose is something different I have never seen before and it's ok or just go a replacement and compare the two.

thanks for all the help...


Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 5, 2021, 10:03 AM

Post #9 of 18 (480 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

By all common sense it's just wrong. Glad you asked for another to come and request honored just send it as it could be the same "wrong" or a correct one. I can't know that.


It says 1234yf on hose I'm unaware if GM named vehicles (any) ever used it? TMK + IMO it's fatally flawed from the get go thought it's use had quit for anything new by now??


That could just suggest rolls of hose made (you said faded markings on new hose) are not up to OE spec or better. Marking and manufacturing can and is hacked or OE was a flaw when new?


I doubt the car companies make much of their own and haven't lots older than this even decades. Out for bid to lowest bidder that can make what is specified.


I said I don't make hose and such would buy like you did except in person so I could refuse something right away ask for another source of whatever I find wrong and sadly a lot isn't right all thru products for anything.


Prices rule in a feature for vehicles where it should be top shelf let cost NOT rule redoing A/C work sets you back worse off than before the original problem so often.


I can say I've never tried to pinch off A/C hose used or otherwise for that matter hose for much of anything doesn't like that.


Please come back and see what replacement is like. Already said if you see it collapse only with vacuum than by common sense it's not going to tolerate A/C pressures I'll go look for a chart is in here locked up top if I fail to post it here look at what temperatures alone do to pressures when shut off the system if very hot takes some time to equalize all that contains refrigerant so is low side only mean nothing for this,


Tom



Double J
Veteran / Moderator
Double J profile image

Nov 5, 2021, 10:15 PM

Post #10 of 18 (455 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

There is no mention of that Rockauto "GM Genuine" part number on any of the reputable GM Sites.
Their part number shows as invalid on GM sites.
They ,RA, do mention the "Alternate OEM number," which is actually the correct GM number.
I'm only familiar with Parts being called, Genuine GM, Not GM Genuine.

I found that you can purchase the actual OEM number online from a Reputable GM site for about the same money as what you got there.
My opinion, send that back , if possible and purchase the actual OEM GM part 23186319


(This post was edited by Double J on Nov 5, 2021, 10:16 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 6, 2021, 3:54 AM

Post #11 of 18 (435 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

I don't think this is that big of a deal. I've bought many hoses from aftermarket parts stores that seemed flimsy but worked out fine.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Double J
Veteran / Moderator
Double J profile image

Nov 6, 2021, 5:00 AM

Post #12 of 18 (428 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

And it may not be.
Just its billed as a GM part , not an aftermarket part.
When i buy aftermarket, especially in todays times, i expect an aftermarket part.
When I buy OEM parts, I expect the best quality.

We know that there are so many third party sellers out there on Amazon and ebay selling knock off parts ,packaged and branded as OEM

Don't know how Rockauto sells, not do I care, as I don't buy my parts online.


jellis56
User

Nov 9, 2021, 12:45 PM

Post #13 of 18 (366 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Replacement hose received today. It has the same characteristics as the hose I have been complaining about. It is soft and can squeeze it more than any AC hose I have seen before. Remember I was complaining the 1st hose was flattening down like the vacuum was pinching itself off. This hose seems identical to 1st hose I got.

The hose itself has these markings on it:
Parker 2041 16mm I.D. 5/8" R134a/R123yf

Paper Label on it says:
ACDELCO
2019 GM LLC
Detroit, MI 48265

ACD#
15-34651

GM#
23186319

QTY.1

GR.9.226
LC 15
077 21181-1339
Made in
Mexico


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 9, 2021, 12:50 PM

Post #14 of 18 (364 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

I think you're making too much out of it. I have bought and used many hoses like that with no problem.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Nov 9, 2021, 2:14 PM

Post #15 of 18 (357 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

? And I haven't or haven't noticed? Two the same Hammer would see mega times as many as I would in NE US some to most would just do without - still.

So with this still AYOR put it on and for the silly amount of 134a make it work and NOW WATCH FOR EXPANSION when first shut off. Engine fully warmed up, system equalizes upon shut down + pressure should spike. Watch it then at a distance - I don't believe it's right still.

Said vacuum is pressure of ~14.7 PSI from outside pushing to get inside that hose. Pressure wants OUT can be normally 2.5 X the temp in F. at that spot is what high pressure knows and should be.

Engine heat added, just shut off both shoot up for a short while. IF you see it bloat it's going to explode IMO.

You see this live I don't. Just be careful if it does that a sudden release of gas no bare skin or eyes near it would flash freeze,

Tom



jellis56
User

Nov 9, 2021, 2:56 PM

Post #16 of 18 (348 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

thank you for replying. I have confidence now I didn't get a knockoff where someone used a wrong hose.


jellis56
User

Nov 9, 2021, 3:48 PM

Post #17 of 18 (342 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

I'm taking both hoses by the body shop thats going to recharge the system when I get it all back together. They are interested in seeing what I'm talking about. I've tried to pull up the hose on Parkers website so I can see what the specs are...

Another thing I'm going to do is call around a couple of Chevy dealers and see if they have one in stock, go there and look at one of theirs and see if it's the exact same thing.

So I know I've been posting alot about a stupid AC hose, I bought the truck back in Jan. and didn't know the condensor was bad and AC didn't work, if fixed it and the AC went out with a bad compressor and after throwing all of these parts in it I wan't to take time get it right...


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 9, 2021, 6:48 PM

Post #18 of 18 (328 views)
Re: Low side AC hose pinches when pulling a vacuum... Sign In

Parts? The car makers don't make most of their own parts! Think about it. It's hose to shaped ends, threaded or a gasket. Any hack today could make stickers now and say it's anything or by any name they want.

A/C of many thing isn't forgiving of mistakes by the last tech to touch it now is YOU.

The only way to know it's properly filled is from empty and fill with known (as much as that can be known) charge of the gas used and oil if ALL was out but isn't.

Condensers are filters now get tossed not cleaned, flushed you just toss those and expect to again if this fails! A quick blow out like the body shops would see will rush out so fast no time to ruin a compressor for lack of oil if it was in use. They are year round with defog/defrost if also warm enough as sensed underhood to just exercise them let some oil circulate.

This (last seen engine/body type) compressor is low in system. Sorry if wrong on that there are 1,000s of makes and models so off the top of my head. That's a mistake just looking at it on paper. Oil will say oil and puddle possible can or did choke those (hydraulic lock) hope it just slips, squeals the belt not throw junk on to condenser.

In the failure how much oil was lost. I used to say look for the mess it made if sudden and guess. Who guessed before you? Now the info is lost start over from zero again - follow me?

IF you can, try some/one is enough, pick-UR-own type junkyard if any nearby. Bring pliers and check A/C hose on assorted vehicles see how it squishes on wrecks plucked pretty clean some let folks grab what they find left. Hoses and wiring usually cut off if the engine was good coming in you doing no harm.

See how they are made up, assorted one most almost certainly use hose made by another as with other things.

Last for now: You said you are sending it out for the final vacuum and charge to a body shop? Great, let them know exactly what you've done and observed especially if you (do this) add oil upstream and measure how much and TELL THEM!

Carry on,

Tom







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