Purpose of a Flared Fitting

[carburatedoron]

I'm replacing a suction line. The fitting on the "compressor end" of the new suction line is flared, but the fitting at this same end on the old line is straight.

What is the purpose of a flared fitting?

New line

UAC HA111964C.JPG (154.7 KiB) Viewed 2032 times

Old line

OEM 97775-3K250.JPG (155.66 KiB) Viewed 2032 times

[tbirdtbird]

I have never seen such a fitting. It would seem that something is not quite right. I would make sure that the 'flared' fitting will seat all the way into the housing, it looks like it might be too long. Are you able to compare your hose with others made for the same purpose?
I would be tempted to have a hose shop cut off the 'flared' fitting and crimp on the correct suitable fitting, assuming you have the length to do that.. Sometimes the bin of fittings contains a rogue fitting that doesn't belong.

[carburatedoron]

I share your concern.

I confirmed with the suction line manufacturer that this is the correct part for the year/make/model. They also confirmed that this fitting is supposed to be flanged per OEM spec. I checked with a different ac parts manufacturer and the suction hose they make for this car also come with a flanged fitting on the compressor end.

I just cannot intuitively figure out how a flanged fitting is supposed to work inside the smooth bore of the compressor, or what it's purpose/value is over a straight fitting.

[Tim]

Cheap Hose.
It looks like the extruder failed the last process to me.

[JohnHere]

What is the year, make, and model of your vehicle? And what's wrong with the old line?

The photo of the old line connector is called a peanut fitting. The photo of the new line connector is called "who knows?"

I've never seen a flared fitting with an o-ring, such as that one, used on any vehicle. I don't see how it can possibly work in place of the peanut fitting.

[carburatedoron]

'06 Hyundai Sonata GLS v6

Pressure lines (suction & discharge), condenser and compressor part numbers each differ by engine size for this vehicle.
v6 p/n is 97775-3K250 - suction line, while the v4 part number is 97775-3K150... two p/n's for the compressor; two p/n's for the condenser.

I mounted a new DENSO compressor, condenser and expansion valve. AC pressure lines are “UAC” brand.

A UAC technical service rep confirmed that the compressor end fittings are different on v4 and v6 pressure lines—v4 is straight ("peanut"), v6 is flared. Same for the discharge line. I checked a different aftermarket brand… their pressure lines ALSO have a flared fitting for the v6. I spoke with a DENSO technical service rep who was utterly perplexed by this issue and ultimately no help. Dealership parts counter couldn’t confirm fittings on OEM lines ‘cause they’re no longer available.

[carburatedoron]

I would be tempted to have a hose shop cut off the 'flared' fitting and crimp on the correct suitable fitting...

Where does one find a hose shop? Maybe a hydraulics supply... that sort of place?

[Cusser]

Disclaimer - I'm not an AC professional.

To me it looks like the O-ring is in the correct place and still larger than the strange "flare" so it might work/seal OK. Does it seat if you test fit it without the O-ring on?

However, I once had to deal once with with the only new high pressure line available (part discontinued through dealer) for my 1998 truck being 5.5mm to long, and didn't seat fully into the compressor and leaked there. I bought same part number from from a different local retailer and it was exactly the same. I even sent this photo to the supplier, who told me that NO ONE had ever complained about this before, and online reviews stated the product worked.


My factory line had developed a pinhole on a 119F day on a quite-curved portion of the rubber hose, and I did not want to try a fix with a barbed connector or try to find a place to make me a hose or use my old existing hose fittings. So I just cut 5.5mm off the new part as the O-ring groove was in the correct place and it has worked fine.

[carburatedoron]

I'm not an AC tech either, so it's entirely possible that I am being overly cautious when I feel resistance as I attempt to tighten the fitting to the compressor. All who read this are likely familiar with the forearm-contorting conditions of working under the hood; this connection is by feel only—meaning I can’t see what I'm doing, so I need to remove the suction line and the compressor from the car and attempt to bench fit one to the other. ...b'woof.

[JohnHere]

As mentioned in another topic, a company called Cold Hose in Ocala, Florida, could probably custom-fabricate it.