When i put water in my water jug it leaks out from sumwea n the truck is running hot What could that be

LEARN TO DO THE TESTS.
use the tool, called radiator leak down test. (has hand pump)
find the like that way safely cold engine or
OR , the classical why
hood up
best when cold a new radiator cap, that does not leak.
run engine until fully hot , takes 15min in summer.
now at this moment, fully hot the RAD and the whole loop is at 15psi pressure
and the magic pressure lets you as the tech find the actual leak.
to the ground? or engine oil pan or to the front passenger toes (foot well flooding
with antifreeze leaking. anywhere
look every where, engine all sides, not just causal glancing,
hose leak, or even squirting and the landing point fools you,before.
all hoses, not just those 2 big ones
heater core leaking or again its 2 hoses only.
water pump leaks
see head bottom edge leak is bad head gasket (or warped head )
freeze (core) plugs leaking,
some intake manifold can leak coolant.
look every where there, make no assumptions find the leak.
yes a cracked head can push combustion gasses to the RAD
and land in the side coolant recovery bottle (jug)
we use the next tool, a combustion leak gas checking tool to top of RAd CAP
A GREEN/BLUE DYE TESTER.


RAD CAP OFF IN THE MORNING DEAD COLD
NO OIL DROPS THERE, NO BLACK CARBON DUST SEEN FLOATING THERE.

DO A COMPRESSION TEST YET? OR CYLINDER LEAK DOWN TEST?

How hot is it running? Coolant boiling away? Fan tension good?

If your radiator is of copper, the cooling fins could be deteriorated to a point that it falls apart just by touching them with your fingers. The back side may look OK but it deteriorates from the front by rain, wind and debris.

ok check these things #1 check for leaks at the radiator #2 water pump for leaks#3 check for freeze plug leak#4 check to see if your cooling fan works#5 check to make sure the water jug is not leaking#6 fill the radiator with water then start your engine and try to see if you can tell if the water flows,if its not flowing check the thermostat,now you can check the thermostat by putting it down in some boiling hot water if while in the hot water it contracts its ok but i would replace it because it is work to go back to do so,check your radiator cap also,now if the fans are the problem then you should change the coolant temp sensor for the fans ,now i hope after making these check you will be able to solve the problem

You never want to mess with a hot engine and radiator since the hot steam is very dangerous. Make sure it has cooled down before you add the water and/or antifreeze mixture. You can check the back of the antifreeze jug to see what the mixture should be.

CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.

DID YOU BLEED AIR OUT THE COOLANT SYSTEM.TO BLEED COOLANT SYSTEM, FILL THE COOLANT SYSTEM THROUGH THE RESERVOIR TANK OR THE RADIATOR UNTIL THE FULL COLD MARK IS REACHED.BESURE TO USE 50/50 HALF WATER AND ANTIFREEZE.YOU CAN BUY ANTIFREEZE THAT IS ALREADY PREMIX 50/50.AFTER ADDING ANTIFREEZE TO RESERVOIR OR RADIATOR FILL RADIATOR TO FULL MARK OR IF YOU DONT HAVE RADIATOR CAP ON RADIATOR POUR ANTIFREEZE IN THE OVERFLOW JUG UNTIL COOLANT LEVEL STAY THE FULL COLD MARK.WAIT AWHILE UNTIL COOLANT LEVEL STOP DROPPING.NOW INSTALL THE RADIATOR OR OVER FLOW JUG CAP.START THE ENGINE AND ALLOW IT TO RUN UNTIL NORMAL OPERATING TEMPERATURE IS REACHED AND THE UPPER RADIATOR HOSE BECOME HOT.STOP THE ENGINE AND OBSERVE THE COOLANT LEVEL IN THE OVERFLOW JUG. THE COOLANT LEVEL SHOULD BE AT THE FULL HOT LINE.ALLOW THE ENGINE TO COOL UNTIL THE AMBIENT TEMPERATURE IS REACHED THEN CHECK THE COOLANT LEVEL IT SHOULD BE AT OR ABOVE THE FULL COLD LINE.ADD MORE COOLANT IF NECESSARY. WARNING BECAREFUL WHEN OPEN THE RADIATOR CAP OR JUG OVER FLOW CAP.USE A LARGE RAG OVER THE RADIATOR CAP TO KEEP FROM GETTING SCALDED.OPEN RADIATOR CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDED.WAIT UNTIL ENGINE COOL DOWN BEFORE OPENING RADIATOR CAP OR OVERFLOW JUG CAP.WEAR SAFETY GLASSES.

Not enough coolant in the system. Wait until it is completely cool, refil with a 50//50 mix of antifreeze and water. Then check for leaks.

Is there a leak somewhere? There should be green or pink fluid on the ground if there is. The plastic jug is often called the overflow this has level marks on the side of it for when the vehicle is hot and cold, cold is at the bottom end of the jug. The purpose of these marks is so you can see the levels without having to open the radiator. When the engine is cold open the radiator, start the motor and look into the radiator there should be coolant at the top of the opening. If not add coolant while engine is running, note if it's pink it's the DEX/Cool, if green any over the counter coolant will do. Add until the level hits the top of the opening. Let the engine heat up and check the level again. If it's full put cap back on and note the level in the overflow jug. If engine is hot level should be at the top mark, be sure to NOT fill the jug to the very top as it needs the space to expand for any over flow from the radiator.
The system will pull extra coolant from the jug when it's cold and use it until the proper temperature is reached then it will "spit" the extra back into the jug. (that's why there are two lines 'hot' and 'cold') Never add water to the jug as it will cause the jug to crack if the outside temperature goes below freezing always add coolant/antifreeze.