1988 240DL N/A with about 300k miles.
In 10/2018, when I got the car, I changed the thermostat with a Wahler 87'C thermostat, made in 2/2015 (I didn't check the date until tonight).
For the past week, the temperature gauge refuses to go midline, where the white dot is.
I removed the thermostat and tested it in my microwave. It will not open, even as my IR thermometer reads 212'F and I see boiling water. It's physically intact, jiggle valve and all. In my garage, I found a new in box Wahler that's like an 82'C and it opened at the correct temperature, same procedure, so my testing and thermometer are okay.
I got the thermostat at Autozone, so I'm going to warranty it.
Unfortunately, all thermostats are special order and I'm stuck waiting for one. I ordered one on Ebay which will come Monday afternoon. Lesson learned: have a reserve thermostat.
Any insights as to what's going on?
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