Hey I've got a 2005 Honda Civic Ex with 176k miles on it, and I've been having abnormal temperature readings from the dash. At a complete stand still it'll slowly climb above the half way mark, and just slowly creep its way up. But after going above 25 Mph it'll drop back to normal. I've already replaced the thermostat, Timing belt, and water pump. What else could it be? After doing all those repairs, my car constantly eats up coolant. I don't see any leaks coming from any hoses, and radiator. I also don't see any white smoke coming from the tail pipe, indicating it burning coolant. Thank you
Are your cooling fans working? If you've actually overheated it there's a good chance the head gasket has blown. You might want to get one of those test kits that checks for exhaust gases in the coolant.
Yes both cooling fans are working, even without the A/C on. They come on as soon it goes above half
Check that the radiator is not clogged. I'd also do the head gasket check.
You never mentioned a new radiator cap. If it's defective, it might be allowing too much coolant to the overflow tank that spits it out while you're driving, hence no puddles or white smoke, the major indicator of a blown head gasket. Like @chucktobias said, a test kit will pin it down. If you keep having weird temp readings, consider a new temperature sending unit, they go bad too.
Actually today I did buy a new radiator cap, still having the same problem
Are you sure you properly burped the cooling system?