I'm getting ready to reassemble my A/C hoses. Do I use anything on the threads of the hose nuts to seal them better?


Thanks, Bill

 

No. The seal is accomplished by o-rings inside the fittings. Just use new o-rings; no need for anything on the threads.

Cheers
DD

 

Which car? The 75 would have flare fittings, No orings. The series 3 got orings.

The flare fittings do leak, expecially with R134a. I use a semi-hardning thread sealer just to keep them tite and flare seals to slow leaks.

https://www.flaretite.com/flaretite-seal

I use this, not to seal but prevent loosening and protect threads.
https://www.permatex.com/products/th...hread-sealant/

 

WOW! Great reply... thank you. It seems there are several styles of the faretite seal and sizes? Any ideas which ones for my 1975?

 

Purple copper.

45° SAE Refrigeration and Gas
Part Number: 37FT-XX-CU-SPP and 45FT-XX-CU-SPP (xx = seal size)

 

Nylog makes a sealant specifically for A/C fittings of all types. There are "red" and "blue" varieties depending on refrigerant type.

 

The XX being seal size. Do I need to know and provide that?

 

Anyone ever made up their own A/C hoses?

 

Yes. I buy fitting from coldhose.com and use this crimper for a/c and power steering hoses. I always try to start with an OE hose and then put the right end on to adapter to the applications. For hard lines, I cut and weld as necessary.