I have done a few of all kinds of water leaks in the ground like maybe 1000 plus and every time I came across one there is one thing for sure , water coming out of the ground and with wet ground, it makes it easy to dig unless your in very clay ground. Lets say you dig about 2' or even more and you find a pipe with a leak ( 90% they are a fitting or a T or a valve) and since you are already sick of digging in the mud so you make a 1' by 1' hole around the leaking pipe. Well if the leaks a hole in the pipe there is no way your going to cut the pipe off and slip a coupling on it and push the pipe together so that's why someone came up with a slip coupling which slides in and out but holds pressure and if you have a hardware store just maybe they might have one in stock in YOUR SIZE OF PIPE! If you are working with PVC MAKE SURE and I mean very SURE that the fittings & pipe are dry before applying primer and glue because if you have water on the pipe or fittings the joint will not hold and if it does check back 2 hrs later. The same can be for a T or valve just you are going to dig more and you should only need one slip coupling because the rest of parts should slip into place.
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Heater core / hose leaking.
because of the oil leaking from the engine
Be more informative on "over heats". Is it being driven along time before it over heats? Is the guage showing hot but not boiling out the radiator, is there steam coming from under the hood, is there a sign of leaking under the passenger side dash or under the firewall on the ground, have you had the thermostate replaced, is the water pump leaking?
Sounds like heater core is leaking
You can tell your rear engine is leaking by looking under your rear engine and see if there's drops hitting the ground.
Under the ground. It comes from dead trees.
It is possible that the antifreeze is coming from a bad water pump. Clean the engine off. Watch it to see where the antifreeze is leaking from, as it could be a hose instead of the pump.
the water that lays under the ground is called ground water.
Could be condensation coming from the exhaust.
your heater core is leaking. this is located most the time under the dash. you will have to have it replaced
easiest way is to fill radiator and look and see where fluid is coming out, but Im sure you thought of that. The best way is to plug the ends of the radiator up with some type of rubber stopper then insert blow air through the drainport while holding it under water. Wherever the bubbles are coming from is where its leaking.
Obviously, there is a leak somewhere. It's possible that it is the gasket leaking, and sorry to tell you that it will be pretty expensive to replace. Without more details of the leaking, I can't tell you much more. When mine was leaking, I was able to get it fixed under warranty. I hope you are as lucky.