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Many possible causes. Leak can be when you drive, but not show on your driveway. The heater could be leaking into the passenger area, though you'd likely smell the "maple syrup" smell of anti-freeze.
It's also possible that you have a head gasket leak into the coolant, causing the overheating, and blowing some of your coolant out. Get a compression test on the cooling system, and a compression check on the cylinders.
Deteriorated or damaged hoses or loose clamps.Water pump seals may be defective if this is the case water may leak from the the weep hole in the water pump body.Engine drain plug or water jacket core plugs leaking. water could be leaking on to oil sensor creating a short
You could have serious trouble with the engine losing that much anti-freeze. If it is not leaking out somewhere onto the ground, it may be from a bad head gasket that is letting coolant burn in the cylinders (you would see white smoke out the exhaust), or it may let the coolant get mixed into the oil in the lower engine's crankcase. Pull the oil dipstick and look at it. If the level is way high, or if the oil color is milky brown looking, then you have water (anti-freeze) in the oil-a bad head gasket, and a big expense to fix it. That would explain the rattling: water in the oil stops the oil from lubricating properly, and the engine bearings and other moving parts inside the engine can be damaged. If this is the case, and the reason for the rattling, then the engine is shot and needs a total overhaul, or you need a different engine. If the coolant was leaking outside, post back. Has the engine ever overheated from low coolant? The rattling is worrisome-have a mechanic listen to it if you get it started. If it won't crank over, have someone see if the engine can be turned by hand-if it still turns freely (not siezed up), then the starting circuit needs to be checked for why the starter won't work. Good luck. Check the oil first thing.
This sounds like a water pump leaking. Get a mirror and see if you can see the place where the leak is coming from. On the water pump is a small hole, this hole is called a "weep hole". it is there to warn that the water pump is getting worn and may fail soon. Anti-freeze, once it leaks on to the engine and gets warm enough to dehydrate then gets some road dirt stuck to it, it does looks a lot like oil and feels a lot like oil. I think your are looking at a coolant leak coming from your water pump. A shop can pressure test the coolant system and find out if it is the water pump or a head gasket. Hope this helps FixYa up.
This is not a good sign, if the engine is running rough then you having a leaking head gasket. If the engine is runing fine then you could have water leaking through one of the head gasket oil ring seals or worst senario is you have a crack in the cylinder block and thats where your water is coming from.
If it's leaking at the top of the engine down. Look at the top of the engine at the front and you'll see a bleeder valve on top a black housing. These housings like to come apart at the glued seams. If it's leaking at the lower part of the engine towards the front, it could be your water pump leaking. Check your oil and if you see the color of the oil looking like chocolate milk, your water pump needs replaced, the oil will need changing as well. Do a coolant system pressure test and see if your hoses somewhere are leaking. Also check for your surge tank leaking. This is the tank that you put coolant into.
First of all ensure that your car is leaking coolant fluid, and what is dripping is not just water condensation from the air conditioner. If you have a coolant liquid leak, it can be from one of the ducts leading to radiator , from water pump or radiator itself. Check liquid levels, and if you have a leak have the car inspected by a qualified mechanic. A broken water pump, for example, can cause your motor to blow in few miles.
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