NO, just pull the plug and put some sealant on the threads. I have always used aviation liquid gasket. It's looks like brown mud.
Hello,
>
>
> does anyone know if there is an o-ring on the bolt at the bottom of a
> reciever drier? i had to remove the bolt to fit it on my car, now i see tiny
> bubbles coming out of the bolt hole. i've tightened the bolt pretty tight,
> should i just discharge the system and add an o-ring or something? or is
> this completely normal? my old r-12 reciever drier had that bolt backed down
> pretty far so i find it weird that now it's a leak point, because now it's
> tigter than it ever has been
>
> -Brandon
>
>