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Pulling the thermostat may not make it run cooler - most cooling systems are designed with such and such a flow through the motor and radiator. Without the restriction of the open thermostat, the water can run by too quick, and not pick enough heat up out of the motor.
This can yield a car that pings and rattles due to being too hot, with the gauge at 1/4 ...
Or it may not on a 3.4. Dunno, but !I! sure wouldn't try that.
OTOH, there may be a restrictor you can buy to put in there in place of the thermostat. If so, the OP may try that.
But I'll stick with my notes - I don't see "water pump" on the list, and I'm curious what temp the ECU is seeing off the ECT.
RwP
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