It over heated so checked water it empty so filled up an realised leak near back of car then started an a large knocking sound from top of engin please help
That doesn't sound good. It appears you have 1 of 2 issues. The no coolant is a bad/blown head gasket or cracked engine block. When the head gasket is bad or block is cracked the coolant leaks into the cylinder blows out the exhaust (have you noticed the smell of coolant or white smoke in the exhaust) then runs by the pistons and into the oil pan (check your oil level it is probably way high) where it mixes with your oil and reduces its viscosity/lubrication. After prolonged driving with coolant/water in the motor your bearing will wear prematurly and cause parts to become looser then they are (hense the knocking sound). If you continue driving with the knock the motor will have a mechanical breakdown and more then likely throw a rod. THis is usually a motor swap at this point. Some mechanics will replace the bearings but either or you will nee extensive work to correct. The head gaskets need to be replaced/checked and the head for warpage/seepage and possibly a cracked block plus fixing the damage to the lower end. Its usually cheaper to purchase a new/used motor as this is somehting that will cost $1000's of dollars so please pick a reputable mechanic for this kind of work... If you have an extended warranty this is the time to use it..
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You may wanna confirm that as the water could still be leaking where it shouldn't . When did the sound start? It could still what I described, you need to run the motor and put your ear all around it to pinpoint the sound (even get under the vehicle and see if its louder on top or bottom). If it sounds like a metal rattling it could be your valves (bad timing, valve guides/clearance). It needs immediate attention. You need to find the water leak and repair it to avoid an overheating motor which can also cause internal engine damage and extended wear..
You could fix it yourself but its a little more then heal a seal. The damage is already done and major repair is needed. Even if it sealed the head gasked leak (which there no way to confirm unless you drive it and check later but risk doing even more damage) you still have the damage already done which needs to be repaired. You can do it yourself but this is a little about beginner mechanical knowlegde. It requires a little more engine, electrical/mechical know how as if you pull something off and put it back incorrectly it will not only not work properly but may damage someting else..
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It appears that you have a minor leak at where a hose attaches to an engine or radiator pipe. When the engine is hot any leak will evaporate quickly and therefore not be seen. As the coolant heats up it will expand into the overflow tank but once the engine is stopped the extra heat build up will force the coolant out the leaking joint. As the engine cools, the leak prevents the coolant from being sucked back from the overflow tank.
The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old. Check all hoses and clamps for a good tight fit and replace any hoses that have gone hard or have become soft and stretched. Those spring type hose clamps tend to be less effective in clamping as the hoses age. Worm drive ones are the best to use.
If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.
If problem persists, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap or any leaks. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick. You will also see white smoke (water vapour) from the exhaust.
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its not leakin into engin the water is leakin from a pipe it sounds like somthing coming up an hiting top of engin
the head is blown if water is in cylinder will that make it thump at top center of engin an would it be possible for me to fix it as have a bit of nollage about cars also theres heal a seal from america recons it fixes it useing the heat from cylinders just pore it in have u any more advice as no warenty skint no job an 5 kids dont know what to do i do have £500 repair cover with AA but void due to the water pipe was corrosion which caused it please help
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