Hi,newbe from Wilmington N.C. I just got a great deal on a xc70 2002, the trans was slipping in 3-4 and a clunk some times, I changed the trans fluid " it was BLACK" and it is way better but not gone yet. Changed the oil and had some sludge grit stuff in the bottom of the filter housing, so I washed it real good. I doubt anyone even cleans these out other than draining it, when you pay for a oil change.
My drivers seat heat is out I will look at the thermostat connection today.
Other than that stuff I love the car It rides a lot like my 99 BMW 525 wagon I had, that was my best car ever I ran the crap out of it! I hope the VOLVO lasts like my bimmer did!!
Thanks for all the great info, I will try to contribute when I can!