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That (132-55/14077122) looks like the correct part - I'm guessing that you had a Stant or Motorcraft thermostat in there when they went bad... I have seen anecdotes of the plastic backed thermostats failing open within a week search other forums over the last few days - sounds nearly epidemic.

Sure you're not putting them in backwards? If so, they would just "flow" once pressure to overcome the spring was achieved. side note, I thought the factory temp was 185F... Pyrometer = IR thermometer. The type/color of surface you measure can affect readings, as can the distance of the...