A/C o-ring size

[TheBMan]

Well, it's that time of year; time to get the car ready for summer drives and show season. Does anyone know the specs for the o-ring shown where the arrow is pointing? Mine is leaking and I can't find the size/spec in the manual. I've replaced it before using one of those kits you get from the various reproduction parts houses but I wonder if it's the correct size. I'm looking for dimensions. For example, 11/16x1/16.

Thanks for the help!

[TheBMan]

Nobody has a parts reference for this?  

[jft69z]

Best bet is to contact one of the A/C places like Original Air Group, Vintage Auto Air, Classic Auto Air, etc. That, or a local auto A/C specialist if you have any in your area.

I have a boatload of o-ring kits from various A/C jobs over the years, but to pinpoint the exact one you need would be difficult without having the parts in front of me. NAPA sells the A/C O-ring service kits, and are bound to have one in there you need.

[TheBMan]

Thanks @jft69z Joe. I did talk to Original Air Group, they didn't know. I have o-ring kits but the problem is that there are a few o-rings that are very close in size to one another. Trying to pinpoint the correct one. I think I just need to give it my best shot based on experience and logic. 😎 I was hoping someone had a parts reference book that had specifics. The regular factory service manual does not.

Thanks!

[jft69z]

22 minutes ago, TheBMan said:

I think I just need to give it my best shot based on experience and logic.

That's exactly what I have done numerous times in the past. If the groove is wide, I'll look for one of the thicker o-rings, but sometimes they're too thick to the point it won't slide into the other fitting. If it's too thin, it won't seal, lol. I have more than enough kits here that I can usually find something to work good though. Good luck!

[420ponies]

Anyone doing that business in your area and specially our 1st gen Montes, or a any "A" Body will know exactly what to use.We have a local that can do wonders on any A/C unit on any manufacturer. Check around your area on any shops that do A/C work, you'll be amazed at what they know.

[Grant MacPherson]

There is also an AC spray sealant that lubricates and seals, also works as a thread lubricant. I can send you a picture of the can if interested  

[1970mcss]

I tried to find a part number but no luck

[Rancid87]

I checked the original line off my car against a store style o-ring assortment I have(the old kind where each compartment has a specific size of o-ring so you can buy just the one you need) and the one that seems to be the best fit has the following specs:

 

ID: 3/4

OD:15/16

Thickness: 3/32

 

The original o-ring is very compressed and flattened so pretty difficult to tell its original dimensions.

 

[TheBMan]

On 3/21/2022 at 7:43 PM, Grant MacPherson said:

There is also an AC spray sealant that lubricates and seals, also works as a thread lubricant. I can send you a picture of the can if interested  

 @Grant MacPhersonThat would be great! Thanks!

[TheBMan]

On 3/22/2022 at 1:43 PM, Rancid87 said:

I checked the original line off my car against a store style o-ring assortment I have(the old kind where each compartment has a specific size of o-ring so you can buy just the one you need) and the one that seems to be the best fit has the following specs:

 

ID: 3/4

OD:15/16

Thickness: 3/32

 

The original o-ring is very compressed and flattened so pretty difficult to tell its original dimensions.

 

@Rancid87 This is GREAT!! Thank you!!

[John S]

If you can get a measurement on it you can look at a company called McMaster Carr, a huge supply house. They have a huge selection of O-rings, the only problem is you may have to buy a packet of 10, 25, or maybe 50 but they are low priced.

John S

[Grant MacPherson]

Here is the sealant