I wasn't sure where post this mix of project car/tips as wanted this too share what i came up with too as DIY tutorials. I saw there is some loose that in here sections has been posted own car threads too.
I have done aftermarket remote keyless system to this car and quick tip how to do.. it i left it here:
viewtopic.php?f=1&t=18758&start=30#p506841
It's easy job.
VIN = YV1LW5106V2336944 - Estate - 1997 850 with 2.4l 10V
v. 2015-
Honestly i was broke and car i had didn't go through inspection and this was going to sell but i thought if i can get because i can't afford fix my earlier car... So lets blame that why i got here in Volvo world
Car has been once fixed from front collision accident (not me
) which i don't have any detailed info but other tyre is more out than other side if look at fenders sharply 
Time goes and it's time for Timing Belt and don't ask me to make your work if you scared how i do.
Then Fuel Pump got me.. and new one from Swedish Parts came and been work since
(firstly had random problems but it was air in system which removed pressing fuel rail valve until fuel came only)
When driving in rain on motorway i thought lets do brake work now as nothing happened in first moments after pressing pedal and then.. Biltema sports!
(been working just fine)
2016
I ordered from IPD to do a breather system but i didn't got right seal for this (BUT now 2019 year i did find that yes i have one!) so i did put old one with lots of sealing grease/glue back on and no problem to this day.
Oil cap did flew hiding on motorway away to scare me... Keep them tight in position. Could be bad.
Thanks again all internet info i did change successfully the gearbox juices. mmmm...
-Both control arms replaced from front during this time-
2017?
Hand brake work for why it stopped working..
2018
Battery holder re-engineered to pass inspection.
.. and that very headache thingy from back. I answered after multiple hours frustration with my own engineered 'hammer hit adapter' and drilled that black rubber around it and then it did come out
And when turn adapter to other side i was able hit new one back. 
Nothing to see here! I didn't try pass broken bottom heater and try use only back heater..
2019
Now did change other side to Meyle HD and other side i did change only those back things to new one. Lets see if it needs be replaced with Meyle HD too then in future. This car loves destroy these almost yearly.
First time in many many years i change brake fluid and these air bleed nuts from back to new because old ones didn't survive opening...
This bottle (of Biltema) works for airing if you screw open the valve into it's final threads.
Anyone..?
Works! If you have patiences.
This has been one pain spot for me too yearly.. i did fix the bad contacts and broke original holding system and glued magnets to hold it so easier continue fixing if need still or change bulb.
..And then snow did melt and this happened.
SEE THAT BOOT IS OKAY!
Only thing was that those clamps it came with wasn't proper fit to keep it at right place and busted fully CV axle. I advice if you put something like these that you surely have right TIGHT clamps AND clean surfaces AND GLUE doesn't hurt if you put small amount there.
I chose Meyle again. Thanks of matthews forums info and Robert video how change this. It was easy.
Friend donated for me original Volvo Radio which i replaced burned bulbs into leds and good enough to me.
This year aim is to fight against all rust before they eat through. Battery maybe needs be replaced as it has been bought at 2014 too and this winter it did let me down if car did sit couple days. And i am looking for Radio to Bluetooth via CD changer faking as i want controls via radio work.
