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Possibly a hose or a freeze plug. Yes, the coolant will go into the engine when it is off and the thermostat closed. As you fill the radiator, coolant will go into the engine through the bottom radiator hose. Keep looking-save your coolant and use water till you find where it is leaking. Stick a garden hose into the radiator, turn it on low, then you can see or feel where the leak is.
maybe you have a blown head gasket your leaking head gasket when ur car is cold open your radiator cap see if the coolant in it try to tap up coolant until the neck of your radiator then start your engine and observe the radiator neck if the collant puks it out if your coolant is pukking out meaning you have a leak or blown head gasket and thats the cuz of your overheating
could be leaking at the top radiator hose going to thermostat, that is a hard spot to see leak remove the air filter and air filter housing look below throttle body you see thermostat housing, check for leaks around thermostat housing gasket and check for leak at the top radiator hose going to radiator and thermostat.if all is good check all radiator hoses for leaks check small coolant lines going to throttle body for leaks and check make sure bleeder screw on thermostat housing not loose it will leak also check around radiator and water pump heater bypass metal lines for leaks.
You should look under the car after it sits a while and see if there is antifreeze on the ground. If so try to see where it could be leaking under the hood directly over the puddle. You could have a leaking water pump. If so there would be dampness under the right side of engine compartment. Also check the radiator hoses at front of car.
SMOKE UNDER HOOD COULD BE COOLANT LEAK FROM RADIATOR ITSELF OR CHECK FOR LEAKING TOP RADIATOR HOSE AND CHECK FOR LEAKING BOTTOM RADIATOR HOSE.LOOK UNDER THE HOOD IF COOLANT BOILING OUT COOLANT OVERFLOW JUG ENGINE OVERHEATING FROM BAD THERMOSTAT OR BAD WATER PUMP.CHECK FOR COOLANT LEAK AT WATER PUMP WEEP HOLE.IF SO WATER PUMP NEED REPLACING.ADD MORE COOLANT UNTIL LEVEL CORRECT.TRY LOCATE LEAK. IF CAR OVERHEATED AND BOILED IT OUT. SMOKE UNDER THE HOOD CAN ALSO BE CAUSED BY LEAKING VALVE COVERS WHICH CAN BE FIRE HAZARD IF OIL LEAKS ON HOT EXHAUST MANIFOLD.
IT SOUNDS LIKE WHT IS CALLED I FREEZE PLUG THERE PUT IN THE SIDES OF THE BLOCK IN CASE THE ENGINE FREEZES THEY WILL POP OUT SO THE BLOCK WON;T CRACK SOMETIMES THEY WILL RUST OUT YOU SAY YOU NEEDED TO REPLACE RADIATOR SO YOU HAD A COOLEINT ISSUE BUT CHECK TO SEE IF COOLEINT IS LEAKING AT HOSES OR GASKETS START ON TOP OF THE ENGINE THE PLUG IT SELF IS VARY INEXPENSIVE AND FARILY EASY TO INSTALL BUT CAN SOMETIMES BE A BIT TRICKY TO GET AT
check for anti - freeze leaks around radiator.look down at radiator where coolant fan is look see if it looks wet below radiator. the radiator is leaking.check all coolant hoses.also check water pump to see if its leaking by the weep hole.if all check out good you could have a intake leak.
If it is a 6 cyl they are known for lower intake gasket failure. look by the drivers side near transmission that is where they leak. if it is leaking there it is about a $400.00 job to fix and unless you are qualified to do it you should go to a garage
Cheap fix first: inspect the line connecting the overflow jar to the radiator. Inspect the overflow jar for cracks. Does it leak while it's parked? Sight down to the puddle from under the hood, It should show you where it's coming from. That's a nine year old car. If it's hard to find you'll need a pressure test (any shop). Perhaps you need new hoses and clamps? Perhaps you're due for a flush and fresh coolant? How long has it been, how many miles? Coolant's a maintenance item. The worst case scenario would a leaking head gasket. It's a joint partway down the engine a few inches below the valve cover(s), Not as common, but it will only get worse. Coolant problems are best dealt with before summer arrives and you become stranded on the x-way.