Aside from broken hoses, coolant leaks may occur in the radiator, water pump, thermostat housing, overflow tank, freeze plugs (in block), the head gasket (into combustion chamber(s) and/or crankcase) or simply a cracked block. An old radiator or blown water pump seal are the most common or frequent source(s) of coolant leaks after hoses. Placing a white sheet of paper (or even newsprint) under your engine overnight may help locate the source of a leak. Coolant is green. Otherwise, be certain that you have inspected ALL hoses. Coolant hoses on some automobiles or light trucks may be located under or behind other components and not visually obvious at first glance, especially toward the rear of the motor. Also, be sure that all hose fittings are tight. Check the thermostat housing gasket, too. This is a domed fitting on top of the motor where a radiator hose attaches. Don't forget the overflow tank, clear plastic typically mounted to fender wall. The water pump is belt driven, typically located at the "front" of the engine and may have a radiator fan mounted to it (as opposed to an electric radiator fan which will be mounted to the radiator itself). Inspect the water pump shaft and housing behind the pulley for signs of leakage. Typically there will be a tiny (3mm) "weep" hole to indicate a failed seal. If the bearing goes, fluid may leak out around the shaft. It will also sound like marbles in a can. Visually inspect the radiator for corrosion which may form around cracks, especially on the radiator passages between the rows of cooling fins and where those passages join the side tanks, as well as where the intake/outflow pipe fittings join the side tanks. There is also a drain plug that is typically threaded. Make sure it is tight and not leaking. If nothing is apparent, run the engine to operating temperature (HOT) and look for small wisps of steam, bubbles or dribbles around the radiator. If the radiator appears clean and dry... Locate the freeze plugs in your engine block which may have been dislodged. There are typically (3) located along the lower sides and one in the front and rear each. Finally, check the engine oil dipstick for a frothy milkshake appearance from coolant mixing with engine oil which would indicate a leaking head gasket. This will be most obvious when the engine has been sitting overnight. If the engine has been running, the oil may appear "smeared" with bright colored streaks on the dipstick. If this is the case, have your engine serviced ASAP as coolant in the engine oil is very dangerous for the engine. Good luck.
well since i am sure that you didn't catch the problem as soon as it happened. you were probably driving it before with coolant in the oil. just check your fluids and make sure you have plenty of both of them. i don't think that another 20 miles would hurt it.
replace it with a new original part. Using unoriginal hoses are ok, but make sure that it's the right dimensions and fuel-proof quality
try replacing the thermostat.that should take care of the problem
check your water pump it has a weep hole in the bottom and will usually run down the front right side of motor
Could be several reasons. Is coolant level very low? If so, probable leak in cooling system. Check hoses. If coolant not low, may well be cooling fan not operating. If fan is working and coolant level is ok, possible thermostat problem. May be stuck closed.
Toyota Long Life coolant. Pricey. Any brand name ethylene-glycol based coolant, mixed 50/50 would be OK.
if coolant is ok!! then check coolant sensor.
Simply get it plugged into an ECU reader as it is probably a fault that the ECU is rembering, if not get a manual for your motor and look for an additional sensor.
I would check the thermostat first but what it sounds like is that the coolant system is clogged up causing no coolant to pass through the heater core. If the coolant is very dirty then you will need to flush out the complete system and this will need to be done by removing the hoses to the heater core and the thermostat. Flush it out several times until you get clean water coming through........
Check for "fog" or smells coming from the heater core, indicating a heater core leak. Check the oil for a milky color in case coolant is leaking into the oil. If these areas are ok, then perform a pressure test on the cylinders, as there is probably a blown head gasket allowing coolant to leak into the cylinder and be lost through the exhaust.
AnswerIt could be just about anywhere, but radiators, hoses and water pumps are common candidates. Make sure you use antifreeze, then after it's had a chance to leak a little, examine the underside of the water pump. If the pump is leaking you'll see a trace of green deposits where the coolant has been leaking.If the water pump is ok, examine the radiator. If there is green around the edge of the tanks of the radiator, you need to repair or replace the radiator.Same with the hoses.Check the coolant overflow/reservoir tank - they develop hairline cracks and leak very slowly.Also, a radiator shop would be able to pinpoint your problem with pressure testing the system. Takes all the guesswork out of the problem/fix.
Have the coolant changed immediately and you will be ok.