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Temp gauge bouncing what gives?

12K views 9 replies 7 participants last post by  TwoBills 
#1 ·
On my lovely trip across Kansas today my temp gauge started bouncing any ideas?
 
#3 ·
Have you done anything to the coolant recently?

Air in the coolant system?
 
#7 ·
Can you describe bouncing? Is it slowly moving up and down like the engine is heating and cooling quickly? If so check the thermostat. Is it going to around normal, then dropping quickly then going back to around normal? if so check the sending unit connection, or the power line going to the gauge. Is it quickly ( like under a second) from top to bottom? If so you may need to check the wire going from the engine all the way to the gauge. The coolant gauge works by providing power to the gauge, then the temp is read by the sending unit adjusting the ground to give you a reading. If that wire is frayed, it could ground out, taking it to a full reading almost immediately. Good luck, Electrical problems are a beast to pinpoint.
 
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