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If by water you mean engine coolant, yes. Loss of coolant, antifreeze, is a major cause of overheating.
drive it without coolant
Some cars have a sensor in the reserve tank that sticks or the sensor on the engine is gone. Get a manual for you make and it will show the locations.
Make sure you have engine coolant. If the engine isn't getting enough coolant, it will overheat, stall and possibly destroy the engine. One symptom is that no coolant is circulated into the heater. Also check the crank sensor, but check coolant first...then the crank sensor.
Yes
Blockage in the cooling system No or little fluid in the cooling system Radiator fan not working
First check the truck for coolant leaks, make sure the coolant level is o.k. If it is there could be a blockage in the radiator or hoses if you have no idea what you are doing take it to an automotive repair facility an overheat could cause severe engine damage
The heater will stop getting hot when you're low on coolant. If the coolant is low enough the engine will overheat and it will be severely damaged.
The cooling system on you car's engine is pressurized to reduce the evaporation temperature of the fluid, to make the system more efficient. If you open the radiator cap when the engine is hot, the fluid sprays out as the pressure equalizes. This can burn the s##t out of you, seriously. It's dangerous and wasteful of the coolant fluid. WAIT, an hour or so, to let the engine and readiator cool off, before taking off the cap. Then you can add water/coolant mixture. DO NOT PUT ONLY WATER into the system! Use a mixture of coolant and water, or straight coolant from the bottle.
low coolant levels
Three problems I know of are one not changing and/or checking fluid level and if you do alot of hauling the more weight the warmer the fluid get and finally the more shifting you do (mostly city driving) the warmer the fluid gets.ni Make sure your lockup torque converter is functioning. It has to work in overdrive or it will overheat. When your torque converter locks up, you have a mechanical link between the engine and rear end. When the lockup torque converter isn't applied, you are coupled from the engine to the rear end through fluid which can churn and overheat in steady driving in overdrive.
Try replacing radiator cap Is cooling fan working? Make sure radiator is not plugged or dirty Check coolant level water pump