Seeking Advice on Troubleshooting Overheating Issue and Persistent Check Engine Light in 2012 Volvo XC70 Diesel

Hey, so I've got a bit of experience with this type of problem. I drive a 2010 Volvo XC60 myself, similar to your XC70. I'm no pro, just have some experience with cars. Had the same issue last year with mine. Turned out it wasn't the pump itself, but the cable connection was defective. Took it to my local workshop, had to cough up around 170 Euro for it. Sorted it right out though, haven't had an issue since. Maybe check that out? Get a mechanic to look at the wiring and connections. I hope it's as easy a fix for you as it was for me. Can you tell me more about the symptoms? Does it only overheat while idling or also when you're driving? Any other warning lights on? The more info the better. Cheers!

(Translated from German)

Hey! Appreciate the help . Reading your experience gives me a little hope that it might not be a big issue. I actually didn't think about the cabling. That's a fair shout, I'll have my mechanic look into it. About the symptoms, it seems to overheat even when I am driving, not just while it's idling. As for other warning messages, the "Engine System Service Required" light is popping up. The overheating is quite consistent regardless of driving condition and it's at 42,594 km on the clock and the last service was done recently. I'll try to provide more details if I encounter other warning signs. Thanks again!

(Translated from German)

Hey, good to hear again from you. It's sure unsettling when your car isn't acting right, ain't it? Anyways, we'll sort it out. Your recent service mileage and the "Engine System Service Required" light coming on could point to other issues. Now, I remember when I had my scare, there had been a recent oil change before the overheating started. So, I had to drain and replace it again as a measure. Just food for thought. But about your overheating, even while driving, it could indeed be an issue with the coolant system, or even the thermostat. Not ruling out the auxiliary coolant pump or the cabling connection here, but just adding some possible leads. Again, I'm no expert, but maybe it'd be worth checking the condition of your coolant, it’s color and level. Also, you mentioned the last service was done recently. Did these issues start after the service? You might want to have a talk with your mechanic about it if that's the case. Keep us updated! Good luck with that.

(Translated from German)

You're absolutely right, it's a bit unnerving. But thanks for chipping in with your thoughts. I've taken some notes and I'll definitely have a long chat with my mechanic about your suggestions. Great point about the recent service and the oil change, now that I think about it, it was around the same time the issues started. You’ve given me a lot to think about and some great leads. Let's see what turns up during the inspection. Thanks a heap for your helpful input! I'll update you once I have more info. Cheers!

(Translated from German)