Hey, I just noticed a bit of information that might be a very big help in your case with Mazda, and might even be worth taking to the dealership, for another attempt to get cooperation from them. This is actually something I'd seen multiple times before, but just didn't remember was there in the TSB. Attached below is the latest release of the coolant control valve TSB, which has had MANY predecessors over the years.Case officially opened. I should hear from the person handling my case early next week.
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This key piece of information is located in the TSB as the first bullet directly following the headings: "REPAIR PROCEDURE/ 1. Verify customer concerns". In that line, Mazda gives a temp range of 104F-176F, and makes a backward sounding statement about it. But if you turn it around to something that makes more sense, it actually says that if the customer's vehicle hasn't EXCEEDED 176F within a set amount of warm-up time, then that's an abnormal condition, and the valve is supposed to be replaced by the dealership.
So for your situation, that statement is really all that you need, because we know (and the tech knows) that your vehicle NEVER goes over 170F. Now although it should be a done deal at that point, what's missing in your case is that there's no P0126 OBD code set. (and I have no idea why it does not get set) And, given their history on this, it wouldn't be a surprise if they try to squirm out by saying the code needs to be set, according to the TSB. But maybe common sense will prevail, and they will finally cave in on this for you.
But if they still don't see it your way, then I just don't see how Corporate can possibly dismiss your claim, when their own TSB supports your case 100%. And I also hope they don't try to say this doesn't apply because your MY isn't listed in the TSB. That would be total BS because the CCV is unchanged from the last time they 'improved' the part a few years ago. And also the 2024 CX-5 is now included in the TSB as well, so it's just a matter of one more TSB release before the 2024 M3 get in there as well.
It's the same POS valve on your vehicle that's on all of the previous model years