Toyota corolla 1993 water pump leaking and steam coming from top of radiator. added chem and weld solution to radiator recently

great question, a nice symptoms posted.!!!! and car !
The water, (coolant) can only go 3 places.
1: on the ground, (or at passenger toes, look there)
2: into the inside of the engine (see engine oil turn to milk chocolate shake?
3: in the the A/T tranny pan, same thing same milk.
4: out the exhaust, pipe end point, see steam there ALL THE TIME?

this is short term loss.
long term is normal this is evaporation.
here are the tests.

1: no steam ,tail
2: no carbon or oil in rad neck (cold)
3: milk in pans. per above.
4: rad neck tester (green/blue) chem test unit finds exh. gasses in the rad.
5: same place, RAD leak down tester.
6: compression test. all cyl.
7: cylinder leak down tester can even show me here it leaks (ASK, this is advanced testing methods but easy to do)

Ya might put the car on ramps...fill the radiator with water...bring the car up to temp then shut it off and see where it comes from.

A weeping water pump will throw water on the belts in turn throwing water everywhere while running.

A leak in the radiator can spray water on cooling fan and completely coat the engine in the same way.

On ramps, you can get an underside view as well as top side to find the leak.

sorry water pump seal ,change it before it packs up completely

Well there are only 3 things that could have gone wrong.

1. Radiator Leak - this means the radiator has developed a hole with via corrosion of the metal parts of simply integrity failure of the plastic parts of the radiator.
2. Hose leak - this could be a hole in 1 of 2 hoses that connects the engine to the radiator. Or it can also be a leak where the hose connects to the radiator (clamp Failure).
3. Water Pump breakdown - this is where the gasket in the water pump has failed and is leaking out the water rather than pumping it.

All the problems above has different ways of diagnosing. but we can probably narrow it down.

1. if the leak is near the radiator then it could be a hose connection, hose breakage or Radiator hole.

2. if the leak is nearer the engine then check the other end of the hose and if its not there then it could only be the water pump is leaking. You can check this if there are water stains on the water pump. The water pump on a 1990 corolla is mechanical turned also by a fan belt. Look for a pulley that has a hose connected to the radiator and that would be the water pump.

Water pump is mechanical not electrical. When it fails it just fails or leaks. Tip: write entire problem. Does it overheat? Does radiator fan comes on? Have you replace the thermostat?

1. Place the water pump gasket (O-ring) on the block and install the pump. Tighten the mounting bolts evenly to 11 ft. lbs. (15 Nm). Install the timing belt covers, making sure they are properly seated and not rubbing on the belt or other moving parts. Install a new seal (O-ring) on the dipstick tube and lightly coat it with engine oil. Remove the plug and install the dipstick tube and dipstick; secure the mounting bolt to 82 inch lbs. (9 Nm).

Using a new O-ring, install the inlet pipe to the water pump.
Attach the clamps and bolts to hold the pipe in place and tighten to 7-9 ft. lbs. (9-12 Nm).
Connect the water inlet and water bypass hoses to the inlet pipe.
Install the water pump pulley and temporarily tighten the four pulley bolts.
Install the drive belts on all the pulleys and adjust all of them to the correct tension.
With the belts in place and adjusted, the water pump pulley will now resist turning. Tighten the pulley bolts to 16-18 ft. lbs. (22-24 Nm).
Install the front engine mount (mounting insulator).
Confirm that the draincocks are closed on the engine block and radiator. Refill the engine with coolant. Reconnect the negative battery cable. Start the engine and check for leaks.

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.

take your car to a real shop and have them pressurize
the coolant system and look for where the coolant leaks,then you'll know exactly what needs to be repaired.take it to a shop you trust.

check for the hoses and their connection pionts if all is ok than the water pump has to be replaced.

Check your thermostat if it's sticking, replace if so.