I use lithium grease for everything and rub it into my hands when done. That stops me from hearing the voices urging me to do bad things to people I don't like, too.

Welcome to MVS. Hot cold diverter door stuck maybe viewtopic.php?p=613629#p613629

Being an 850, it may not have a cabin filter! If not, one from the V/S70 can be fitted by pulling the holding frame from a junkyard.

Neil.

If you need a frame I have spares. You should get 35F delta in recirc mode, fan speed 3-4, 2500 rpm after 5-10 minutes. These AC units are powerful and work well at correct charge. Vacuuming, pumping down for 1 hour, then two cans 680 grams should get you there. A bit undercharged in hot climate, a ...

As the 850 never had the filter, they are more prone to ingesting crap that can work it's way into the bottom of the AC evaporator in the cabin air system. You can see it if you remove the cabin fan and use a small mirror and a flash light to look along the airway to the left of the fan. Look for al...

Look for the telltale dark stains of pag oil that foretell a leak in the evaporator …like this

Welcome to MVS. Hot cold diverter door stuck maybe https://www.matthewsvolvosite.com/forums/viewtopic.php?p=613629#p613629 Also, I realize maybe you meant the hot/cold airflow flap in the climate control system. I had considered that, but figured that was probably functioning fine, since with the A...