Thermostat is broken or someone changed non-original thermostat.
Those do not work.
Only working (which is also oem) spare part is Motorad Cold climate zone thermostat 5461-82K.
Other does not work. Tested 10+ thermostat on here skandinavia.
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.
I spent a good chunk of change on the Mishimoto thermostat and it got stuck closed within a couple months. Needed the car back right away and all I could get was a dirt cheap MotorRad one. Darn thing has been it in now without issue for a good long while now.
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.
Get that mishimoto garbage out of there and put a new oem thermostat in there. Unless you really lile pulling the engine out, to replace coolant seals and rusted rotors...
please remove the mishimoto thermostat they fail a lot, it happened to me as well.
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