Honda Jazz Overheating: Coolant Valve vs Other Causes

Hey there! I had similar issues with my 2015 Honda Civic (gasoline). The symptoms you're describing match what I experienced, engine overheating and check engine light. Turned out it was indeed the coolant bypass valve cable connection. Just got it fixed last month at my garage. The mechanic found that the connection had corroded, causing the valve to stick in one position. They had to replace the entire bypass valve assembly and reconnect the cable properly. It took about 3-4 hours for the complete fix. It's definitely not something you want to ignore, if left untreated, it can lead to serious engine damage because of improper coolant flow. The job itself isn't super complicated for an experienced mechanic, but it needs proper diagnostic tools to confirm it's the bypass valve. Just make sure you get a proper inspection first, sometimes similar symptoms can come from other cooling system issues too. Best of luck!

Hey again! Thanks for sharing your experience with the bypass valve issue. This is super helpful as I'm facing pretty much the exact same problems. Quick question, do you remember roughly how much you ended up paying for the whole repair? Also, has everything been running smoothly since the fix, or have you noticed any other issues pop up? I'm particularly worried about potential engine damage since mine's been acting up for about a week now. Your advice about getting a proper inspection first makes total sense, really don't want to replace parts unnecessarily!

Hey! Happy to give you an update! Yes, I remember exactly, it cost me 155€ for the repair. The mechanic found that the cable connection to the coolant bypass valve was defective, just as they suspected. They got it sorted pretty quickly, and I'm glad to report that my car's been running like a dream since then! No more overheating issues or warning lights at all. Trust me, getting it fixed was totally worth it. My engine temperature's staying exactly where it should be now, and the car's performance has actually improved a bit, guess that stuck valve was affecting more than I realized! You're right to be concerned about potential engine damage. I'd definitely recommend getting it checked out ASAP rather than waiting. The week-long issue you've had probably hasn't caused any permanent damage yet, but why risk it, right? Just make sure whoever looks at it properly diagnoses the problem first. In my case, they did a thorough check before zeroing in on the bypass valve, which gave me confidence they weren't just guessing. Let me know how it goes!

Thanks so much for all the detailed info! I actually took your advice and bit the bullet, went to a mechanic yesterday. You won't believe it, but the whole experience turned out way better than expected! Found this family-run shop, and they were super professional. They did a thorough inspection and, just like in your case, confirmed it was the bypass valve causing trouble. The total bill came to a bit more than yours, around 200 bucks including labor and parts, but honestly, it was worth every penny. The best part? They fixed it in just under 3 hours, and my Jazz is running perfectly now! No more scary temperature gauge climbing up, and that annoying check engine light is finally gone. The mechanic even showed me the old valve, it was pretty corroded, just like you mentioned. Really glad I didn't put this off any longer. Thanks again for pushing me to get it checked out properly, you probably saved me from some serious engine problems down the road! Time to enjoy my problem-free car again!