Cooling water

First thing to check is to make sure that your cooling fans work. Let your Honda idle for 20-min or more. The cooling fans should come on and cool down the car. It also sounds like possibly your radiator cap is not holding pressure, so I would replace that as well. When you turn on your A/C, do the cooling fans come right on ASAP? Because they should, however this is only a partial test. Do the idle test, with the A/C off, this will test the other prats of the cooling fan system, such as the Coolant Temperature Sensor etc.

It was the radiator cap. It was that simple.The cap looked OK but I replaced it on general principles. That solved the problem. Can't believe it.

check the radiator pressure cap