BMW XM Overheating: Bypass Valve vs Heating Issues

Hi there! I have some experience working on BMWs, had a similar issue with my 2020 BMW X6 M last winter. I feel your pain! I also got overheating warnings and heating problems. Turned out the root cause was actually a faulty water pump that had damaged the bypass valve. Since my car was under warranty, BMW fixed everything at no cost. They replaced both the water pump and bypass valve. Before you head to the shop, could you share: Current mileage? When did you first notice these issues? Any strange noises from the engine bay? Is your car still under warranty? I'd hate to see you deal with bypass valve repairs if it's actually something else causing the problems. Let me know those details and I can share more about what to expect at the shop.

Thanks for the detailed response! My XM just hit 7507 KM and had its latest service done. The issues started about a week ago, and I haven't noticed any unusual noises yet. Yes, thankfully it's still under warranty. Based on what you shared about your X6 M experience, I'm definitely getting more concerned it could be the water pump. I'll make sure to mention these symptoms when I take it in. Really appreciate the help!

Hey again! Thanks for those details about your XM. You know what? Your situation sounds exactly like what happened with my X6 M, started acting up right after hitting around 7000 KM. The fact that you're not hearing any strange noises yet is actually good news. In my case, I waited a bit too long and ended up hearing this annoying whining sound from the engine bay before getting it checked. Since your car's under warranty like mine was, I'd strongly suggest getting it to the dealer ASAP. With my X6 M, waiting only made things worse, and the pump ended up damaging other components. The whole repair took about two days, they had to flush the cooling system completely after replacing the pump and bypass valve. Quick tip from my experience: make sure they check the coolant level sensor too. After they fixed my pump and bypass valve, the sensor was giving false readings for a while because of some residual air in the system. Had to go back to get that sorted. Don't worry too much though, BMW's warranty coverage is pretty solid for these issues. Just get it checked out before you end up stranded somewhere like I almost did!

Thanks so much for the extra details and that tip about the coolant level sensor! I'll definitely get it to the dealer right away, don't want to risk making things worse like you did with your X6 M. You've really helped put my mind at ease about the warranty coverage too. I've already called the dealer and booked it in for tomorrow morning. They said they'll do a full diagnostic check, including everything you mentioned. Really appreciate you taking the time to share your experience, it's been super helpful! I'll make sure to update the forum once I know what the actual issue is, just in case anyone else runs into similar problems with their XM.