Overheating and dealer "fixed" twice, still happening
Looking for advice on what I can say to the service department to have them look in the right direction, because our warranty is up at the end of October, and I want to get this overheating issue resolved under warranty!
About two weeks ago, my wife was driving our 2013 LT (~47.7 k miles) around town for school pick ups, and got the "Engine Hot / AC Off" message. She immediately pulled over, and cut the engine. When she started it up later, it was ok and she kept the heat on just in case, and we took it in on /8/17 for various issues (overheating, AC blowing cool not cold, and some trim/non-warranty issues). They found a leaky compressor coil for the rear AC and fixed that under warranty and told us the overheating was the result of the AC working too hard in combination with the cabin air filter being extremely clogged (never changed was their words, which was another annoyance as we had it in there for the 25k service, and they should have changed it). I'm not really a "car guy" and this seemed like nonsense, but I agreed to change the cabin air filter and keep an eye on it.
Less than a week later, it was overheating again (or close to it, we put the heat on before it got past the last tick mark and hit 260), so we took it in again. They found the water pump was leaking and replaced that under warranty and waived the deductible since we were already in for the same issue.
On the way home from the 2nd attempt to fix the overheating, the needle started creeping up to the 1st tick (~225 max, I'd guess) and when I turned the car off and came back 5 minutes later and turned it over, the temp was up at the last tick mark (~247.5-250)! It came down after a short time.
Yesterday, after the car was parked in sunlight, we were driving in windy roads leaving a park at 20-25 mph on low-grade hills and the temp hit 235-240! Once we got on the freeway, it came down (guessing due to better airflow at 70 mph), but it seems like the issue is still not fixed.
Some additional info as of now:
- coolant level looks good
- radiator from what I can see from the front in between the grill is not too clogged up, some debris but not terrible
- a friend of mine said he thinks it could be a leak between the water jacket and the combustion chamber
Any ideas? I'm going to give them a call tomorrow morning to get a 3rd appointment, but at this point I'm wondering if I should try a different dealer. If there's anything I can say to the service rep to put into the notes for the tech that might steer them towards the right thing to look at, I'd appreciate it!