Grandland X Hybrid Overheating Mystery: Sensor Issue?

Hey there! I have some experience with hybrid vehicles and faced a similar issue with my 2021 Vauxhall Crossland (also worked a bit on my cousin's Mokka). When my car had overheating problems, I took it to my regular workshop. Turned out it wasn't the temp sensor, it was actually a loose cable connection near the cooling system plug. The mechanic showed me how some wiring had come loose, causing incorrect readings. Total fix was €95, and it solved the problem completely. Before jumping to conclusions about the sensor, any other warning lights besides the check engine? Does it overheat more during city driving or highway? Have you noticed any coolant leaks? This might help narrow down if you're dealing with the same issue I had or something else entirely.

Hey, thanks for sharing your experience! Mine's at 241347 KM and had its last service about two months ago. No other warning lights showing up at the moment. The overheating seems to happen mostly during city driving, especially when I'm stuck in traffic. Haven't spotted any coolant leaks, and the levels look normal when I check. That's interesting about the loose cable, might be worth checking that out. Did your mechanic mention how common this issue is with Vauxhalls? Really appreciate the help!

Hey again! Good to hear back from you about your GrandlandX situation. Yeah, after fixing that loose cable issue on my Crossland, I actually had a long chat with my mechanic about these problems in Vauxhalls. He mentioned that while the loose cable thing isn't super common, it does pop up from time to time in newer hybrids. Since you're seeing it mainly in city driving and traffic, that's really similar to what I experienced. My car would get particularly grumpy when sitting at red lights. The fact that your coolant levels are normal is actually a good sign, that was the case with mine too. Given the mileage on your car (mine was around 220,000 km when I had the issue), I'd definitely suggest getting those connections checked first. My mechanic showed me that these hybrid systems can be a bit finicky with their electrical connections, especially after a couple of years of road vibrations and heat cycles. Just out of curiosity, have you noticed if the temperature gauge drops back to normal when you're moving at higher speeds? That's what mine did, and it turned out to be another clue pointing to the electrical connection rather than the sensor itself.

Thanks for all that detailed info! That's really helpful to know about the hybrid systems being sensitive to electrical connections. And yes, actually, now that you mention it, the temperature does tend to normalize when I'm cruising at higher speeds on the motorway. That's exactly like what you described! I think I'll take it to my mechanic tomorrow and specifically ask them to check those connections first before replacing any parts. Could save me a bunch of money if it's just a loose cable like in your case. Really appreciate you taking the time to share your experience, it's given me a much clearer idea of what to look for. I'll let you know what they find when I get it checked out!