My '04 XC90 headliner completely failed while driving on a hot summer day with all the windows down, resulting in foam dust everywhere and zero visibility out the back. After looking at all the extensive DIY methods to fix this, I settled on the cheapest and fastest idea I could muster: https://www....

ordered the hose, o-ring and thermostat. eager to see if my thermostat is bad! will report back.

Did the job today and the code cleared. real PITA to get the intake pipe off the throttle body and replace the vacuum hose from the evap valve to the backside of the throttle, but got it done. thanks for the help!!

the old one was indeed gunked up and dead.

I'm aware. Sometimes they list parts in VERY weird categories. All the decoupling pulley bits are listed as transmission parts?? https://usparts.volvocars.com/a/Volvo_2009_XC90-32l-6-cylinder/_51507_5832313/Transmission/GR-376577.html?assemblySearchGuid=16494F94-8C91-48CA-8D42-83D352775D1A Anyhow, I...

thanks matthew. will add some seafoam to gas...can't hurt. just changed oil, so donlt want to add any to crankcase now and may not ever due to the higher mileage. also reluctant to do the intake method, since the car is port injection I don't see any benefit now after seeing Paul's valves. Yes, I dr...

Appreciate the detailed reply. I'm pasting my maintenance history (parts and mileage changed) since I've owned the car, beginning at 119,000m, below. I've done all required maintenance and nearly all proactive fixes to mitigate potential issues. It is recently that the fuel MPG has tanked, so I feel...