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You might need to either replace your thermostat or the radiator itself. I can't tell what "tube" you're talking about, but it COULD just be the radiator cap that's bad and you're venting into the tube that goes to the coolant recovery reservoir. If that's the case, just get a new radiator cap. If the radiator hose is leaking, replace it. Unfortunately, I can't tell what's wrong from your description.
There are several things to check for overheating. check all belts,,hoses,,and the recovery tank. If the recovery tank is not in good condition,it will not recover antifreeze when engine warms up and transfer it back to the radiator. Next, and the most common problem, is a radiator that is partially blocked internally. Try a good commercial radiator flush,,follow the directions exactly for best results. If it still overheats, have the radiator serviced by a good radiator shop. Make sure you are using a good quality antifreeze/water mix. DO NOT use just water. Antifreeze raises the boiling point of the cooling system,,it is supposed to do that. Remember,,HEAT is the main killer of engines and transmissions. It is worth the money spent on keeping the engine from overheating.
air trapped in your coolant system. take the radiator or coolant recovery tank cap off if you don't have a radiator cap. Take it off when the engine is cold. Start and run the engine at idle with the cap off. Keep adding coolant if you see the level go down. Continue to do this until no longer see any drop in the fluid level. If your fluid does not move, then your water pump is the culprit and not moving the coolant out of the engine.
Drain the radiator into a container. Remove the upper hose at the engine end. Remove the 2 bolts in the thermostat housing and remove the thermostat. Clean both surfaces and install the thermostat "O" ring. Install the thermostat ,housing and 2 retaining bolts. Install the upper hose and fill the coolant recovery tank.jd
Leaking hose? Defective thermostat housing or bad thermostat gasket? Bad water pump or gasket? Leak in radiator? Leak at heater core? Leak at head gasket? Coolant recovery tank?
If you are talking about the low coolant light then it is just low of coolant. Add coolant to the recovery tank. If you are talking about the coolant temperature light, then the engine is overheating. You may need to have the cooling system serviced. Drain the coolant and flush the system. Install a new thermostat, and add a 50/50 mix of antifreeze and distilled water.
Radiator full and coolant recovery tank filled to mark Radiator full and coolant recovery tank filled to mark
It uses the cap on the coolant recovery tank as its "radiator cap".
Follow the small hose from the radiator. It goes to the recovery tank.
If you have a threaded cap on your coolant reservoir that is your " radiator cap "
u put it in recovery tank if need it only!
All hoses on the recovery tank go to the radiator.