I had the same issue, in the end, the thermostat was faulty, and the dealership replaced it for free. I didn’t have any warning light on the dashboard either.
motorad from rockauto is doing me good so far
MOTORAD 7416203 with 203 temp is good.
The SNN-2000-195 model is good and I have zero complaints about it. I've used them for awhile now.
My 2021 Mazda3 Turbo has classic thermostat failure symptoms: \n\n- Erratic warm-up (sometimes stuck cold, sometimes near overheating). \n- Upper radiator hose stays lukewarm even after 20+ mins of driving (revved to 3K RPM to test). \n- Housing burns hot, but hose never gets scalding\u2014clear sign of a stuck thermostat.
If your thermostat is from Nappa and says Motorad on it. Then replace it immediately. They are junk and stick closed.
I noticed mine is a "motorad" and it's the cheapest shittiest one and it's been giving me problems.
I had the same issues, less than 4 moths, this brand doesn't work.
I did notice before I recently got safety/emission test for plate renewal, i wanted to confirm the I/M readiness had ran, that at idle, the full trims were extremely rich. I'm leaning towards the lower tstat having something to do with that. I have a 195 motorad(blah) that i had just installed before the plenum work. ECT didn't break 178 degrees on a highway cruise at 95+ degrees. That seems to be right at the threshold for the current dtc.
I had issues with the MotoRad that every parts store in Canada seems to sell
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