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I
think that your problem is more electrical than mechanical. Try testing the ECU coolant temp sensor (with a MDM is a brezze) or a voltmeter.
You have 2 sensors. Single wire for the dash stupid neddle and the 2 wire for the ECU.
Or you can use a aftermarcket gauge for thesting if your car coolant temp
Even without thermostat, coolant temp should get to normal operating range AT IDLE just take longer
Also, the radiator will not be cooling water as efficient because water will pass too fast.
My sugestion:
1.Check your engine ground, 90% of all 240 sensors playfullness is caused by faulty engine grounds
2.Check coolant temp by other method (MDM-100 or aftermarket gauge)
3.Remove the thermo for test
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