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EleanorWyatt

I've been driving my 08' V70 for past 2 years with no issues (got it @160k miles and now at 176k). The internal temperature sensor (the one in center panel) fan has always been making intermittent noise, more like a humming sound every few seconds. I never paid much attention to it. Recenlty, about 1-2 weeks ago, this noise became louder and almost thumping. This continued for last 1-2 weeks and then, the center console’s sound system, started to reboot itself and rebotted itself several times during a trip. The next morning, the sound system didn’t turn on at all when the car was started AND, the humming sound was gone - the temperature sensor fan seemed to no longer run. Then, at some point, the audio system came back on, along with temperature sensor fan. The next day, when I started the car, the dashboard was full of warning messages: parking brake, SRS, brake failure, low tire pressue indeicator was on. I drove off and the car was running 100% normal from mechanical perspective. As I was riding, the dashboard seemed to have a life of its own, every now and then it would go black, RPM/Speed indicators would drop to zero, come back with various warning messages which then would go away to display as normal. Throughout this, audio system never came back. Also, when I shut down the car, the dash would stay on. Then after few restarts, it would shut off. Reading posts w/similar problems, I haven't found one where isseu was resolved. I don't have the VIDA so I guess that's something I should be getting? Also, should I first look into the battery health? Thanks so much in advance and please help with any pointers! #1 · Jun 2, 2021 I've been driving my 08' V70 for past 2 years with no issues (got it @160k miles and now at 176k). The internal temperature sensor (the one in center panel) fan has always been making intermittent noise, more like a humming sound every few seconds. I never paid much attention to it. Recenlty, about 1-2 weeks ago, this noise became louder and almost thumping. This continued for last 1-2 weeks and then, the center console’s sound system, started to reboot itself and rebotted itself several times during a trip. The next morning, the sound system didn’t turn on at all when the car was started AND, the humming sound was gone - the temperature sensor fan seemed to no longer run. Then, at some point, the audio system came back on, along with temperature sensor fan. The next day, when I started the car, the dashboard was full of warning messages: parking brake, SRS, brake failure, low tire pressue indeicator was on. I drove off and the car was running 100% normal from mechanical perspective. As I was riding, the dashboard seemed to have a life of its own, every now and then it would go black, RPM/Speed indicators would drop to zero, come back with various warning messages which then would go away to display as normal. Throughout this, audio system never came back. Also, when I shut down the car, the dash would stay on. Then after few restarts, it would shut off. Reading posts w/similar problems, I haven't found one where isseu was resolved. I don't have the VIDA so I guess that's something I should be getting? Also, should I first look into the battery health? Thanks so much in advance and please help with any pointers! See less See more Sort by Oldest first Oldest first Newest first Most reactions #2 · Jun 4, 2021 Yes, you want to rule out a system low-voltage condition, as it totally messes up the computer modules and the CANBus. Similarly, there could be an intermittent short circuit that causes low-voltage dips. Or, you could have a failing alternator. You don't necessarily need VIDA. Some of the newer ODB-II hand-helds are much more easy-to-use (Autel, iCarSoft i906). For instance, you can continuously watch a graph of the system DC-voltage while driving. If there is anything erratic, it will show up on the graph. These tools will save you thousands over the years....it's the most important tool a used Volvo owner needs to have. The same tool will tell you if you have CANBus communication problems (rodent-chewed wires is main culprit). Insert Quotes Post Reply

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