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Temp fluctuation

Does anyone know what will cause the temp gauge fluctuate?
After I'm driving awhile the temp gauge will move up and down between 220 and 230 and also between 230 to 240.
Not sure how accurate my temp reading is.
 
Thermostat getting stuck? Hose getting pinched? Low water (coolant) level?
 
You may get more views if you move this up to Engine and Drive Line topics. Alot of us don't go this low on the main page very often.
What are the normal running temps? Surely not that high most of the time. What speeds does this occur? Sitting still or on the highway at driving speed?
Are you boiling over? Need a bit more info to help with answers and suggestions.
 
get a harbor freight pyrometer. check for difference in temp at radiator, thermostat housing and back of block when it is doing this.It will help diagnosing this
 
Is your sender in the top of the manifold? Air in the cooling system can make a pocket around the sender and then sloshing water will make the gauge fluctuate. Try loosening the sender and let out any trapped air. I've seen this and fixed it this way.
 

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