Strange temp. problem!

[19984X4]

I'm having a crazy problem with my 1998 Explorer. Sometimes while driving the temp gauge will start showing the temp going up. You can tap your brakes as if to stop and it will go back down to normal. The engine is full of coolant and has had a fresh oil change. When the needle starts rising I'm seeing nothing else happening strange,,,,, any ideas??

 

[storlied]

Check your grounds from your body to your engine, and body to frame..

 

[19984X4]

Any idea how many they are and their location? thanks

 

[jlsparky7]

Prolly a bad thermostat. How to video in the link in my signature.

 

[my98nnj]

Check the electrical connection at the sensor.