Took another look at the picture and the stuff looks bad on return line,
That can't be temperature-related, so I went to check how it looks on my bus.
The stuff is tar-like substance that was probably applied by fingers on the joint, where foam insulation would not fit.
Lousy craftsmanship, but than Germany is not a country where people use AC.
Push it back around the pipes, especially the smaller one and call it a day. You can add a chunk of Styrofoam
Took another look at the picture and the stuff looks bad on return line,
That can't be temperature-related, so I went to check how it looks on my bus.
The stuff is tar-like substance that was probably applied by fingers on the joint, where foam insulation would not fit.
Lousy craftsmanship, but than Germany is not a country where people use AC.
Push it back around the pipes, especially the smaller one and call it a day. You can add a chunk of Styrofoam.
View attachment 155449
Thank you for looking into this for me. I feel much better about this now...was a bit concerned before.