Rep Power: 0

Hello, i have civic 2006 ex coupe bought back in march of this year with only 118k miles. First thing i did when i got the car was flush the coolcant and replace the thermostat, use honda coolant and thermostat which previous owners use honda stuff. Now recently i started doing some ubereat delivery. I make quick stop and leave the car running and when i come back temperature gauge goes up past the key looking symbol here is a pic


goes little higher but never to the h and i turn on my ac goes back to below the key looking thing which mean normal temperature. I do hear the fan come on and off(ac off) but doesnt stay on long enough...also when the fan comes on the gauge goes up which is weird!? And when i drive off goes back to normal.

So what can it be???

 
Rep Power: 210

if thats as high as it gets i wouldn't worry about it

 
Rep Power: 0

Like u see in the pic that me idling no ac on and normal fan comes on for few second the the bars goes up 3 more and fan comes on and off like normally. Either i drive off or turn on the ac that went goes back normal.

 
Rep Power: 518

Check the fluid level in the radiator, it needs to be completely full.

Display showing center of the gauge is perfect.
Yes it will go up and down a little bit depending on conditions.
There might be 30 degrees difference between the coolant temperature driving down the road, vs. the temp where the radiator fans turn on....

Got a scanner that can display real engine temperature as seen by the computer? Plug it in and watch temperatures. Bonus points if you get a scanner that can display both ECT1 and ECT2.