2010 Hyundai Sonata 2.4l Coolant Temperature Gauge Goes Up and Down Randomly? Part 1

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Today we have a 2010 Hyundai Sonata 2.4l the customer said the coolant gauge will randomly go full hot or cold while driving. They had already been to other shops and the coolant sensor was replaced 3 times. Follow along as we try to figure out what is going on with this vehicle.

Part 2:
   • 2010 Hyundai Sonata 2.4l Coolant Temperatu...  

Tool Used:
eSCAN ELITE
https://www.aeswave.com/eSCAN-ELITE-p...

OTOFIX D1 PRO Automotive Diagnostic Scanner [2-Years Updates]
https://amzn.to/414mGmY

Utest kit Advanced Terminal Test Kit
https://www.aeswave.com/uTest-Advance...

Snap-on Zeus
https://www.snapon.com/EN/US/Diagnost...

11-inch Phil's Electrical Piercing Probe
https://www.aeswave.com/11-inch-Phil-...

TopDon Thermal Imager ITC629
https://www.amazon.com/Thermal-220%C3...

Codes:
P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

0:00 Intro
0:15 Graphing Engine Temp With Escan
2:00 Trying To Look At The Cluster Data
4:00 Wiggling The Coolant Temperature Connector
6:17 Testing Pin Tension With The Utest Terminal Kit
9:50 Testing The Repair?
11:35 Measuring Voltage On The Sensor Ground And Power
15:30 Voltage Randomly Changed?
17:50 Looking At Engine Temperature
21:30 Measuring Engine Temperature With A Thermal Camera