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Message: <blockquote data-quote="Saint" data-source="post: 1225210" data-attributes="member: 16561">Update, replaced thermostat, began to burp system, Saw smoke, Upper radiator hose was leaking slightly where it meets the radiator....Fan WAS NOT ON, Turned on A/C, Fan came on immediately. Replaced Engine Coolant Temperature Sensor (ECT) and Replace Coolant Temperature Sensor. Check Engine Light (CEL) has now turned offFan now comes on without turning on the A/CLeak coming from upper radiator hose where it meets the radiator.  Diagnosis: Small Pin hole in Radiator = System not holding pressure (can also see where someone put sealant around the hole)Will replace next weekend when I have time and update.Cheers</blockquote>