2011 screw 4x4 with 3.5 ecb. Last week I noticed my engine temp swinging from normal temp to 20° low and then back to normal. I keep a scan gage 2 plugged in. With engine temp displayed. The temp gage in the dash never moved and there are no codes. I replaced the engine temp sensor in the back of the passenger side head and I still have the problem. What are the chances that the wire / plug is going bad? What are your thoughts? Oh yeah engine coolant is full. Thanks