Soon as i bought Motorcraft all was normal again
Gave up and bought the genuine Mopar stat, haven't had issues since.
Finally got around to replacing the thermostat on my 2000 XJ. Temp rarely hit 210 unless I was idling for a while so I suspected a bad thermostat. Sure enough it was stuck in the open position. I was able to find an OEM one part # 5202 8186AC. 195 degree with a weephole. Noticeable difference in performance and it’s nice to have heat again.
Replace stat with a Mopar 195f unit for optimal results.
Make sure you use the motorcraft thermostat.
Go with the Motorcraft thermostat as it has a rubber seal on the outside edge.
I replaced the one in my sisters V8 WJ with Mopar and it was made in Israel and very high quality.
I had a very similar issue. Radiator and Thermostat replaced after accident. 2014 WK2 3.6 V6 was overheating when I drove up the mountains in Colorado. The problem was the mechanic put a Napa thermostat in, then replaced with another napa thermostat. I bought a MOPAR thermostat and swapped it myself.
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