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coolant temperature indication problems

Engine

Model: Boxster S, Year:2001, Mileage:53,200, Type of use:Street use only
Coolant temp indication is erratic. Temp indication is never above normal (approx 180), but temp needle goes to the peg (low, as if gage is unpowered), then returns to a normal temp indication after 30sec. to 1 minute, temp gage red light flashes and check engine light is on during this condition only. This is an intermittant problem, sometimes this doesn't happen at all, even during a drive of 1 hour or more. Temp sensor was replaced, did not cure the problem, condition is still the same as described above.

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