My car overheats to a boiling point .The fans are working.I loose no coolant.There is no white smoke on my exaust.There is a lot of air building up in the system ,because I have to bleed it constantly.No much coolant is coming out of bleeding screw,mostly air.I changed the thermostat,still no luck.It seems there is no pressure on coolant.Could this be a problem with the water pump?Please help!!!! Thank you.Frank

Did anyone make sure the engine cooling fans work/ came on? This is my first check, unless it is obvious that the head gaskets are blown(lots of white smoke out the exhaust).

If it's spraying out of the spout and is boiling, it's very possible that one of the head gaskets blew depending on how long it takes to overheat.

A few things to look for:
Inspect the radiator. Make sure all of the cooling fins are there, and not obstructed by dirt/debris.
Make sure the cooling fan is turning on (it should turn on when the temperature is approximately at the halfway point of the temp gauge).
Look at the color of the "smoke" coming from the tailpipe. White = steam. Some steam is normal, however, if it's constant, and a lot of it, it's a blown head gasket indicator.
Blue = burning oil. Black = unburned fuel,

Defrost is turning the fans on so there is probably an issue with the fan controls on the car.

My first guess would be the cooling system has some air in it from the radiator job, or the thermostat may be sticking.
You say it is loosing coolant, so you are putting coolant in every day or week ? Is it loosing it on the ground when it overheats ?
If you are adding coolant but not seeing it boil over, it could be burning it and you would not see smoke from the exhaust.

You didn't include enough info to really help but most times overheating is caused by low coolant level from an external leak, a failed or failing thermostat, a bad radiator fan (electric or clutch type) or fan relay, coolant sensor etc. Any obstruction to air flow through the radiator or internal obstruction can also cause an overheat. Last but not least, either too much water or coolant can lower the boiling point. Make sure you have a 50/50 mix and a good pressure cap of the correct pound rating. (I think yours is rated at 16-19psi)
If you see white smoke from the tailpipe even after warm up, you may have a blown head gasket. In that case you'd need to take care of that but should also find the initial cause (any of the above).
When doing any testing be very careful...opening a system even when not in overheat can cause hot antifreeze to come out quickly and with force. (can make for very bad burns)
If you narrow down the problem a bit and need more specific info, just ask.

CHECK WATER PUMP WEEP HOLE IF LEAKING. BECAUSE OF SHAFT BEARING FAILURE CAUSE CAR TO OVERHEAT. MAKE SURE COOLING FAN WORKING CHECK FUSE AND RELAY.SCAN CAR TO MAKE SURE THE COOLANT TEMPERATURE SENSOR WORKING.IT CONTROLS FAN OPERATION.BESURE YOU ARE USING CORRECT COOLANT MIXTURE.YOU NEED 50 % ANTIFREEZE AND 50 % WATER. TO RAISE BOILING POINT.TOO MUCH WATER IN COOLANT SYSTEM WILL CAUSE CAR TO OVERHEAT.

how do u change the water pump in a 1993 toyota camry v6 engine?

I would suggest to check to make sure the fan is not on backwards. I dont know if its possible to even put it on backwards. just check to make sure that the fan is pulling air thru the grill instead of blowing out the grill. Also look into the radiator and see if you can see any lime or sediment in the radiator tubes. It will be white in color.A small amount of scale on the inside of the tubes act as insulation, and keeps the coolant from contacting the tubes and transfering the heat to the tubes so the air passing across the radiator can carry it away. Just flushing the radiator wont remove the lime scale, the radiator would need to be remove and dissassembled and rodded out. I dont think you have a blown head gasket yeti,if it not blowing water out when its cold and you dont have any performance problems, runs fine, just overheats. You might try turning on the heater when it starts to overheat and turn the heater fan on high as it acts as a radiator and see if it cools down indicating the cooling capacity of the radiator is diminished

check for air in the system,as it will give a reduced water volume to the coolant temperature sender. there is also a fan switch on the rad that turns on the cooling fan,if your fan does not come on it will overheat.
look for green around the coolant sensor,as it mayn be leaking and drawing in air

Having the radiator rodded is a good move. Retest. If it has an electric radiator fan check temp sensors. If the fan has a clutch it may need to be replaced if its slipping with the engine hot. Check bellts. Its likely a fan air flow issue if the engine overheats when the care is not moving or is moving slowly. If the engine overheats only with AC on that narrows it down. Write back if that's the case. Lots of things can cause this. Antifreeze and a good radiator cap discourages boiling. Pressure in the radiator raises the boiling point but it can't build up pressure if the cap is bad. Antifreeze also raises the boiling point. If actual boiling happens in the engine then steam builds up in critical places and drives the collant out of the block making the engine even hotter than it already is. Replace the cap. Check the antifreeze.