I have a 1993 Honda Civic LX Automatic. When the car is moving or sitting at idle the engine temperature is fine, when I take off from a complete stop the engine temperature begins to rise then slowly lowers back to the normal operating temperature. I've checked the radiator fluid level, checked for leaks, even checked if there is water in the oil pan. Everything checked out fine, no leaks or water in the oil pan. Any advice will be gladly appreciated.

Thanks,
Frank

I would replace the radiator, which may partially blocked due to corrosion or mineral buildup.

Replacing the thermostat with an OEM Honda part is always good insurance with cars showing signs of overheating or getting too hot, they only last so long and aftermarket parts aren't too great when it comes to Honda thermostats.

An old timers radiator test is to take it out with the help of a friend, hold your hand over the bottom hose neck, fill the radiator with water then release the lower neck and let the water run out, if it runs out quickly then its not clogged or restricted to bad, if it keeps draining for what seems like too long, then it needs replaced. YES this procedure takes a little experience but if the water doesn't rush out then there may be a problem with it.

You can also spray down the front of the radiator with your garden hose, the water will evaperate from the areas that get hot and not evaperate so quickly from the restricted areas, also not a perfect test but always test parts before replacing them. You may need to unplug the fans and keep an eye on the gauge to not let it get too hot. Depends on how long it takes for this water to evaperate, the fan will tend to dry up the area in front of the fan a bit more quick but a cool spot (restriction) should stay wet longer still.