Overheating

Well they did a pressure test and carbon test abd said it was fine.

Also, a carbon and pressure test were done and they came out okay.

Four cylinder front wheel drive automatic 92,500 miles.

My car has recently started overheated and it is getting very annoying because I now have to make frequent stops on long trips to put in water and to have the engine cool down a bit. I was wondering what the problem might be and if replacing the radiator would help any? I have already purchased a new one and want to know if there is anything else I can do to resolve this problem? Any answer would help. Thank you.

Sounds to me like you have a blown head gasket. Water is getting into your engine and evaporating thus leaving white smoke from the tail pipe. A customer came into my shop with the same problem. After replacing the head gasket, everything was back to normal.
This was his problem; car would be okay to drive first thing in the morning soon as the car got hot, the car would shut off and you would have problems starting the car. Car would crank but would not turn over unless you force it by stepping on the gas. Radiator does not leak nor does the hoses, but water is always gone from the radiator and the reservoir.
Hope that helps you out.

Have you replaced the thermostat?
Other possibilities can include the water pump and radiator.
If you continuously are burning up coolant or you have combustion gases in the coolant system then you might have a head gasket leak. Coolant and oil mixing in the oil pan along with white tailpipe smoke are other indicators. Since the block and cylinder heads are made of aluminum, overheating can warp the facing so if there is a head gasket leak then there is a strong possibility of a warped or cracked block/cylinder head.

Thank you so much for all these helpful answers. I have replaced the radiator and the thermostat and it was working fine for a few weeks and now it just overheated again. Do you think that changing the head gasket would do the trick? How much does that usually cost?

Are you burning coolant or oil off?
What percentage of ethylene glycol is in the distilled water? And yes you need to use distilled water because all that stuff in the radiator you replaced built up because of the minerals in the water hose.
What kind of thermostat did you purchase?
Was the water pump in good condition?
You need to also check the EGR for proper operation and the catalytic converter. Pre-ignition or detonation in the cylinder can also cause overheating.
Usually this is caused by to much carbon in the cylinders (similar to dieseling) but can also be caused by an excessively lean mixture.

The biggest problem you might have to consider with a blown head gasket is a warped cylinder head, which can happen very easily on aluminum materials. This would require a visual inspection of the mating surfaces between then cylinder head and the block for variations larger than.0015 of an inch. In some instances the block, if warped, can be milled down true; however, if the cylinder head is warped usually the only alternative is to purchase another.

I have 2002 civic. The story goes like this: overheated in a severe way. Replaced the thermostat. Twice. Would run for a while at normal temp. If you shut it off then run it again, it would not go very far before getting hot. Ran the heater, when hot it blew cold air. Replaced the radiator=same issue. Had timing belt, water pump, both cam seals and crank seal opposite the transmission replaced. Ran home (45mi) with temperature dead on where it was supposed to be. Got in it the next morning, same symptons after 5 minutes of being at normal temp. Found a leak at the heater core hoses so all three (3) were replaced. (The assumption here is that the water pump was old, likely original, and did not drive enough pressure to warrant a leak but the hoses were so old that they got hot, expanded and allowed air into the system due to degraded material.) Drive home again (45Mi), no issue. Got in it 30 minutes later, starts to run hot after 5 minutes. Car was properly burped (nose in the air using a stoppable funnel). I'm at a loss. I'd hate to think this is a head gasket after having most of the engine taken apart earlier.