it means it is time to get a new one
The radiator hose which I assume you mean although you write rad, is connected to the radiator. One on the top of the radiator and one on the bottom. the one on the top
drain the radiator down below the top hose and unhook the hose from the radiator and the engine and pull the hose off.
Look on top of the radiator and follow the hose from the radiator to the thermostat housing. Look on the bottom of the radiator and follow the hose up to bottom of the block.
Upper is hose connected to top of radiator, lower is hose connected to bottom of radiator.
1. Open the radiator cap. 2. Disconnect the top radiator hose. 3. Run the engine for a couple of minutes with the hose off. 4. Insert tap water hose into the radiator where the top hose should be. 5. Run water into the radiator until clear water comes out of the radiator top hose. 6. Continue idling the engine, remove the tap water hose from the radiator, shut off engine as soon as the water stops coming out of the top water hose of the radiator. 7. Reconnect top water hose and fill radiator with antifreeze. Start engine and top off antifreeze.
Look on top of the radiator and follow the hose from the radiator to the thermostat housing. Look on the bottom of the radiator and follow the hose up to bottom of the block.
The thermostat has not opened yet.
At the to of the radiator.
When the thermostat is open the coolant will flow through the top radiator hose in to the radiator and out to the water pump through the bottom radiator hose
probably need a new radiator cap. very cheap and easy fix.
The coolant comes from the engine at it's hottest through the top radiator hose, cooling as it goes lower and lower in the radiator until it comes out the bottom radiator hose at it's coolest temperature and back into the engine.
punto sx radiator drainingRadiator has two hoses. One at the top of the radiator,(The top hose) and a hose at the bottom of the radiator (The bottom hose). Wait until the engine is cool. You need to undo the expansion tank screw top (where you top up the radiator)then release the bottom hose clip (use a screw driver)which allows you to pull off the hose from the radiator expansion tank adjoining the radiator. Make sure you have a bowl underneath to catch the water.