shouldn't be an issue, you need the switches connected and have power anyway to diagnose and fix the issue. Access to the sliders to grease them is impossible without powering it to move up and down.

yep, fix the PCV or else you're going to destroy your seals.. in the meantime if you want to drive it, pull the dipstick out slightly to vent the extra pressure.

I found that DIY stuff on s80 2.9 is very scarce and I started posting my pictures on facebook for people to view it or ask questions. https://www.facebook.com/Diyvolvos80-100231145274321/photos/pcb.100263475271088/100233401940762 I bought this car really cheap with lots of issues. both front window...