Car overheats when i stop at a light or in traffic the temputare goes all the way to hot. I have changed the thermostat and both fans. water pump is good

Did you check/replace the thermostat? Another possible cause may be hair line cracks in the head(s).

Check for collapsed radiator hose first.

Do the cooling fans come on? If not, check fuse, relay and if still no function- fan thermostat switch.

If fans do come on, replace water pump.

The two statements are contradictory. The thermostat should assist in warming up the engine in the cold but if it is stuck closed it would overheat but warm up quickly. Overheating in the summer could be the fan not kicking in in traffic. You can check a thermostat by boiling it in water and observing the temperature at which it starts to open. This information should be stamped on the unit. You can also watch the fan to see if it kicks in with the engine idling when hot. If it does not it could be the thermostatic switch or the fan itself.

It could be the water pump , or something else , like a faulty thermostat. Where is the coolant leaking from ? If it is leaking from the water pump , then yes , your pump might be toast.
If the thermostat is no good , the engine will warm up to normal temp , and then overheat quite quickly. As it overheats and the coolant expands and boils , it could back up into the overflow reservoir and leak out onto the ground. You need to get someone to diagnose the problem ASAP , running your engine in an overheat condition could very quickly blow your head gasket and/or warp a cylinder head. If you can , please post a bit more info. Does it run but at a higher than normal temp. Does it only overheat when stopped in traffic etc.
Could be water pump , or thermostat , or plugged up radiator , or nonfunctioning cooling fans.

when engine is at its hottest,pop the hood and make sure the fans spinning,if it is, then NO PROBLEM.when it blows steam/goes in the red then look to change thermostat/water pump. another check is if the temp goes right down when the heater is on full,change thermostat.

u should check for a faulty thermostat first, they are only a few quid and easily replaced. if no change ur most likely faults are a blocked radiator or faulty water pump. u dont sayhow old ur van is but after the thermostat go to the radiator, when its hot check the bottom of the rad to make sure its hot, also brown water means u need to bback flush ur cooling system. even tho u have changed some sensors doesnt mean u got the fan switch sender, dash board sender and fan sender tend to be different sensors, so just double check.

You need to check youe water pump, thermostat and your radiator cap and if all of that is good it sounds like a blown headgasket.

All you have is one or two fans? Have you checked or replaced the thermostat? The thermostat opens when the engine gets to operating temp, and allows the water in the radiator to flow through engine and the water pump pumps the water out of the engine back through the radiator to cool before it goes back through again. I check the lower radiator hose to see if it get hot like the top hose or you could take the lower hose of the pump to see if it is pumping. I would start with a radiator flush and do this a couple times, prestone makes a flush and Im sure someone else does. do that then change your thermostat, make sure when you put the new one in it goes in spring side down..

Check
1)thermostat and also that the electric fan is kicking in when it gets above normal temp
2)blocked radiator
3)worn water pump (more so from electrolysis, ie not using the right antifreeze)

The water pump would be the next step. Look over the belts as well, A system flush may help.