{Chrysler 300} Re: A/C Fun

[Kevin deGraauw <kdegraauw@xxxxxxxxxxx>]

Exactly. Technically per some old FSM reference I saw when dealing with mine,  you can use just the oring provided you have the exact correct one but it HAS to be the correct crush depth when you tighten it down and it squishes onto the case of the compressor surface. It will look a little " pillowy" in the groove of the fitting side and it should stay in the groove and not fall out when you go to tighten it up. Then it will gently squish to the correct profile of the cavity. A round oring one won't do this properly.

Would LOVE if someone can make these square orings in the green HBNR r134a friendly material as then it would be perfect. But the black Viton EPDM one works if it's fresh.

Also there cannot be one pit or abrasion anywhere on that mating surface or yes it will leak. Give it a smudge of refrigerant oil of choice on both the compressor mating surface and the oring itself ( I dip my orings into a clean little bath of it)  before bolting it all down, amazing what a difference that will make too.

That fiber one works on the suction side too but they technically carry a different part number for it and the hole needs to be enlarged just slightly if you are in a pinch and can't find one. That fitting does not have a oring groove in it so it sits on the gasket just fine.

Kevin

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From: James Douglas <jdd@xxxxxxxxxx>
Sent: Thursday, August 29, 2024 6:27:07 PM
To: Kevin deGraauw <kdegraauw@xxxxxxxxxxx>
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: A/C Fun

 

Thanks. The Gasket is shown as 1994-406, but down on the page there is a:

 

“SEAL, Compressor Discharge Fitting� 2008-388.

 

I am assuming this is the square cut round seal that fits in the groove.  It is a little odd to use a o-ring of any profile with a “regular gasket, but I assume that is what they did.

 

I wish the exploded diagram was better and showed both…

 

Thanks, James

 

From: Kevin deGraauw <kdegraauw@xxxxxxxxxxx>
Sent: Thursday, August 29, 2024 16:53
To: James Douglas <jdd@xxxxxxxxxx>
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: A/C Fun

 

Use both an oring (but use a square cut profile), not round one,  and a fiber gasket. That steel fitting has a groove in it for an o ring- have to use that. The fiber gasket seals the rest. When I took mine apart to service my compressor, it had both, so I found both at Classic Auto Air or OPGI- can't remember. 

 

Do not waste your time with the steel stamped gasket, that is for later compressors with flat fitting faces on them. 

 

Good luck!

 

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From: 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Thursday, August 29, 2024 5:41:53 PM
Cc: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} A/C Fun

 

For the second time I have taken the 300K into the A/C shop. The new clutch assembly is working fine. The new condenser is working fine.

 

Now when they try to get a full charge the fitting at the front of the compressor is leaking.

 

The fun part is that I have THREE different gaskets for that fitting.

 

1. Is a square (round) O-ring.
2. Is a “standard Gasket� and is an NOS MOPAR.
3. Is a steel one from an aftermarket dealer.

 

The one on the car is leaking. I will take it off in the AM. The shop tried a new O-ring and it did not seal….

 

Mt question to this august group is can anyone tell me which one they have used and it does not leak and/or does one use a combination of the O-ring and one of the others?

 

Since it is a 40-minute drive and waiting around for 4 hours each time I go to the A/C shop (nobody in San Francisco can deal with old car A/C) I end up killing an entire day. I really do not want to go for round three and come home warm.

 

Any ideas would help? I have a couple of spare fittings, and I took the better looking of the two and hand lapped it on my lapping plate in a figure eight motion to make sure it is flat. The only other thing that may be possible is the furnace braze of the tube to the mounting plate may be leaking and the shop is perceiving it as the sealing material. The problem is that I do not have a compressor that can generate 250 PIS head pressure at home to test it.

 

Hug!

 

James

 

 

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