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Why is my temperature gauge going up and down

I have a 05 Honda Civic EX, my temperature gauge has been going up and down. I thought that maybe it was the thermostat and had it replaced but I am having the same problem. It actually has got worse when I am driving the gauge goes up but when I let off of the gas it goes back down but once I start pressing the gas it will go up again. When im at a complete stop it goes up slowly too, i notice when i have the heater on once it starts blowing cold air the temperature raises. I checked the coolant and its fine so that's not it.

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We still have a 2006 Civic Hybrid in our family.

In reply to: Why is my temperature gauge going up and down

But to me this sounds like some blockage or a failed electric fan on the radiator. You'll want a service manual to see how to test the fan but the blockage or possible value would be more likely a service shop repair.

At this age it may be time for a flush and have them test that thermostat.

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Erratic guage

In reply to: Why is my temperature gauge going up and down

Hi, roadrunner; I agree with Robert. Sounds like a partially plugged radiator or a problem with the impeller on the water pump. I've seen them worn away or slipping on the shaft. Hopefully, the thermostat wasn't installed upside down.
Good luck.

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