when car running water going back from radiator to the side bottle can you help me what is the issue please

 

What kind of car do you have?

 

I have Hyundai Santro Plus 2001 model

 

Try a new radiator cap.....

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I tried new radiator cap change all radiator pips but still the same thing

 

Unfortunately....you might have a blown head gasket. Something seems to be over-pressurizing your coolant system. You can do a cheap and easy test to find out. Go get a radiator leak tool, usually free to borrow from parts stores. Top off the radiator with coolant and pressurize the system to the manufacturers correct pressure. See if you lose pressure. If you do, you have a leak, most likely a head gasket. REMOVE all spark plugs BEFORE starting the engine after you conduct the test if you do not visually see a leak somewhere on the external areas of the engine/heads/hoses/heater core. WHY....? Because if it is a head gasket thats allowing combustion chamber gasses to get pushed into the cooling system through a leak in the gasket, then during that coolant system pressure test, if you DID lose pressure, coolant might have filled one of your cylinders with coolant. If that happened, and you start the engine, you most likely will lose the entire engine to hydralock. Then you will need to tear the engine down and rebuild/fix the broken internal parts.

I don't know anything about that make/model car....but any car out there can blow a head gasket and then over-pressurize the coolant system....and that coolant will flow out of the radiator and into the over-flow tank first.

If the coolant is flowing into the over-flow tank right after you start it up when the engine is cold.....then thats almost certain what it is. But can't say 100% either.
Sometimes with blown head gaskets, if its a big leak, some cars, the coolant will make it to the tailpipes and you can see the coolant spitting out.

Start with the free pressure test. Don't start spending tons of money chasing the problem. If your spark plugs are easy to remove...take them out after you do the test IF you did lose pressure and even if you did see a coolant look somewhere, just to be safe if you also have a blown head gasket. Turn the engine over a few seconds with the spark plugs out...then put them back in.

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The same test done by Mechnic he said your head gasket blown he said you need to change your gasket can you please advise if i can sort this issue without changing head gasket because i already spend alot money on my car.

 

As advised above, a blown head gasket - I concur with everything mentioned above. Not much way around this. Figure out why it blew first though - bad thermostat or bad water pump?? Head gaskets leak from either overheating or perhaps never changing the radiator fluid which eventually causes cooling system corrosion.

Rick

 

OK Dear Thank for your advise i will go ahead with it. Thank you so much again.

 

It sounds like you have a good direction since this type of issue would be common to all cars. For future problems, you may note that this site is dedicated to General Motors cars with V8 engines: https://en.wikipedia.org/wiki/LS_bas...l-block_engine