Dad has a 2017 Jeep Renegade. During their last trip to Caribou the external thermometer quit and set to 128 degrees.
When that happens the car suddenly decides "You don't need any cabin heat" unless you use the defrost setting which is 100% heat all the time.
So I jump on the google machine and find that the exterior thermistor has failed. Chrysler says you need to replace the passenger side mirror, $350. Fortunately I found a YouTube video with a link to the part required. Its too bad that the video stinks because its got good information in it.
Anyway the hardest part of the job is disassembling the mirror:
I really shouldn't make fun of the video creator too much because I didn't get pictures of the clip locations either.
With the back of the mirror off there is a little like pimple down at the bottom of the mirror that houses the thermistor. Digging that out with a little screwdriver caused it to totally fall apart.
Putting the new thermistor on is easy although I did break off all the extra plastic to get 2 clean wires I could slide heat shrink tubing over so there wouldn't be a short. I then potted the new thermistor into the little pimple with some silicone sealant.
Totally fixed the problem and the new thermistors were like $10 for 60...
Unfortunately the failed thermistor sets a persistent check engine light. I own an OBD-II adapter for my phone but it was, of course, at home. I'd bought another one for dad but he's lost it...
When we're up in July I'll reset the check engine light but the good news is that it doesn't seem to hurt anything else...
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