repair the leak
You replace the radiator
Some have an internal transmission cooler & extra small internal radiator for that purpose.
Probably a radiator leak or a split radiator hose.Check coolant levels in the radiator.
To replace the thermostat on a 1999 Toyota Corolla, first ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the hoses connected to the thermostat housing. Unbolt the housing and take out the old thermostat, replacing it with a new one, ensuring the gasket is in place. Reassemble everything, refill the coolant, and check for leaks.
there could possibly be an internal leak in the radiator if the lines from the trans are going to the radiator pull the rad cap and check the coolant and also fluid also burns up and sludges up
First of all, check the thermostat, the radiator fan, radiator hoses, water pump, radiator leaks. P.s. If you install a radiator fan universal and it don't place really close to the radiator, you can have that problem
Be care-full my radiator blew up and burnt me. I replaced Radiator, thermostat, and water pump. Timing belt is in the way so I replaced it too. OK Now
To replace the water pump on a 1994 Toyota Corolla, first disconnect the negative battery terminal and drain the coolant from the radiator. Remove the timing belt cover, then take off the timing belt and any accessories obstructing the water pump. Unbolt the old water pump, clean the mounting surface, and install the new pump with a new gasket. Reassemble the components in reverse order, refill the coolant, and check for leaks.
To replace the antifreeze in a 2003 Toyota Corolla, start by ensuring the engine is cool, then locate the radiator drain plug and place a container underneath to catch the old coolant. Open the drain plug to let the old antifreeze flow out, and once drained, close the plug. Next, remove the radiator cap and fill the radiator with a new 50/50 mix of antifreeze and distilled water. Finally, run the engine for a few minutes with the heater on to circulate the new coolant, then check for leaks and top off if necessary.
It is the radiator warning light. Usually it indicates low radiator fluid level. I have had this come on when I have had some minor radiator leaks leading to radiator coolant level going down.
a hole in the radiator
First You Would find the drain plug on the left or right of the bottom of the radiator,locate the plug screw the plug out let the fluid drain put the plug back,go to a local parts store get 1 gal. of antifreeze pour that in first, then fill the rest of the radiator with water/check for leaks,no leaks your set for life.