Questionwater drains out of reservior tank when i stop motor .have replaced but it still happens when car cools down. car has been manufactured for australian market
AnswerI'm going to presume you're referring to the coolant reservoir (and not the washer reservoir).
When you say water drains out, do you mean the level goes down or that the coolant is overflowing and dripping onto the ground?
If the former, this may well be a normal condition. Coolant expands as it is heated, and some is expelled from the radiator into the reservoir. As the engine cools, the vacuum in the cooling system opens a valve in the radiator cap which in turn allows the coolant to flow back into the engine.
If you are referring to the coolant overflowing onto the ground, then you'll need to perform a cooling system audit to see what is and is not working properly.
Start with the reservoir and verify the coolant is at the full line in the reservoir. If the reservoir is overfilled, the expansion noted above can be enough to cause overflow.
Next, check the coolant in the radiator. Is it low? If so, top off and check for leaks.
Next, start the engine and turn on the a/c. Both radiator fans should run. If not, diagnose the radiator fan circuits.
After verifying the proper coolant level, remove the radiator cap and start the engine with a/c off. As the coolant gauge arrives at the halfway point (or somewhere close to that point), coolant should begin circulating in the radiator. If the coolant begins to boil or the fan comes on prior to the coolant circulating, you have restricted flow, likely indicating the thermostat is stuck shut.
A short period of time after coolant has begun flowing, the radiator fans should begin to operate. If the coolant boils prior to the radiator fan operating, you likely have a problem with the fan circuit. If the fans operated during the a/c check, it's likely that the coolant temperature sensor is reporting too cold a temperature to the engine control module (ECM), which in turn is not turning on the fans.
