Over heating losing water from radiator no visible leaks

Doesn't sound good. If you have no leaks, you most likely have a bad headgasket or cracked block. Have you ran it with engine light on, or temp gauge high?if its a small leak, liquid glass or something like it can seal it. Check with local auto supply.

Check engine oil, possible cylinder head leak.

You may have

- a coolant leak somewhere, comes out when the engine heats up and pressurises the radiator. Camrys do develop a crack in the plastic radiator top tank, which can be hard to see if on a seam. Another place which leaks is under the intake manifold, which is not visible. There is a test, called a "leak-down" test

- thermostat stuck closed, preventing coolant circulation

- a leak through a head gasket from a combustion chamber to the coolant jacket. This will quickly cause overheating, and sometimes causes white bubbles in the radiator neck, like dry ice. There is a test kit available for gases in the coolant.

try the thermostat, located on the top radiator hose. top side of engine. also does it steam?? does it lose water but no leak, does the heat blow hot? if your heat isnt hot and it steams and loses water you may have a cracked head or head gasket. if you have heat, doesnt lose water and doesnt steam it may also be your water pump. most pumps will leak visibly from the weep hole when running

SOUND LIKE HEAD GASKET LEAK.CHECK ENGINE OIL FOR SIGNS ANTIFREEZE CONTAMINATION..OIL WILL LOOK LIKE MILK SHAKE.IF USING WATER IT EVAPORATES AT 212 DEGREES. ENGINE COOLANT TEMPERATURE CAN CLIMB UP TO 220 DEGREES.IF OIL IN CRANK CASE LOOKS GOOD.ADD 50/50 WATER AND ANTIFREEZE. ANTIFREEZE WILL RAISE BOILING POINT TO KEEP COOLANT FROM EVAPORATING.SEE IF YOU LOSING WATER ITS BOILING AWAY LIKE WATER IN A TEA KETTLE.

Very likely, the water could be being sucked into an inlet port or blown into a exhaust port. You could try something like Block Leak as a quick fix, I am not really in favour of that route, but it could save you a costly head replacement.

If you know for a fact it's the radiator, then replace it. If it's leaking, has been damaged in an accident etc. If there are no visible leaks, replace the thermostat and thermostat housing gasket first. If it still overheats, or is losing water, check and if necessary repalce the water pump. If the water pump is good, then check the heater core (should be under the dash inside on the passenger side) and you may need to remove some things (heater vents) to get to it. If this is not the problem, then drain the radiator and block, and put the new radiator in.

If you are overheating, and all cooling systems are good, and you are losing water then you may have a blown headgasket. Do Not drive the vehicle. Have the head(s) and block checked thoroughly for cracks and have the head gaskets replace (both of them).

Check the oil and if it has a milky look to it, (white/greyish color) then you have a blown head gasket.

Thank you,

carandcomps

could have a hose leaking, heater hose, upper or lower radiator hose, coolant recovery tank leaking, radiator leaking, water pump leaking. You could put something under the car when you park it to get a general idea where to start looking for the leak. Make sure what ever it is you will be able to see the water when you get up in the morning. Might try a large piece of cardboard cut to fit under radiator and engine all the way up under fire wall just to have the whole engine bay area covered so you'll be able to find the leak

It could be your head gasket.

Hi,

One possible explanation is that the leak is small and the water escapes as steam. This then would lead to no immediately visible water leak under the vehicle and being small, the coolant system is still capable of preventing an overheat. Most likely spots would be the junction of the radiator hoses either to the radiator or to the engine side. One possible way to check is use your Toyota as you normally would but before shutting down the engine after a long drive, pop open the hood and check where steam or water might be leaking.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.