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I noticed when data logging that ect is about 10 degrees cooler than tstat rating on very cold days while cruising. I thought had bad tstat and put new one in. Same thing! The ect sensor resistance agrees with specs and seems accurate. Before starting the car it agreed with ambient. It’s located in the metal line to heater core in factory location. Heater works good, so getting flow. 91 fox with a9l and quarterhorse, logging with binary editor. I wondered if I should locate the sensor in tstat housing for better accuracy? Or is it not an issue? Waiting for a warm day to log again


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ECT value is based on voltage. You should compare it with known accurate temperature meter. Also it sounds rather normal. Temp will be near tstat temp when load is bigger. I have oil temperature meter for track days, it tells better when to cool off. Oil heats fast with high loads.
 
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