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(I don't know so please disregard the following as junk)
As a possibility:
1). The coolant temp sensor might be located near the head/block or the exhaust manifold exfil ports.
Those areas could rise quickly under duress and lower just the same.
Do you know where the coolant temp sensor is located?
2). Coolant absorbs heat.
Driving on the highway and pegging on a small hill doesn't make sense at all.
Is there something else missing?
Like radiator fan/switch/headtemp/other?
Probably not but it is worth mentioning.
3). Start with any OBD2 codes thrown in memory.
The computer knows all.
hahaha.
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