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The ECT is the 2 wire switch which sends signals to the ECM and if it is faulty or has a loose connection, the engine would run rough and even stall after engine is warmed up. Restarting would be difficult as well.
The 1 wire switch is the temperature sending unit and is only for the gauge.
As to the engine running hot, does the radiator cooling fan run continuosly or does it stop and run intermittently when temp is showing hot?
Revving up engine to get the temperature down could be due to a bad or weak water pump as the coolant flow is insufficient.
Lack of coolant is another possble cause and since you do not have coolant losses, it should not be the cause.
Friday, March 20th, 2009 AT 11:25 AM