Yes, coolant is in the block, heater, hoses and radiator all the time.
It depends on how long a person spends washing their car. When using a self-service car wash with high pressure hoses, the amount of water used is about 3.5 gallons per minute. Washing a car without high pressure hoses uses about 8 gallons per minute.
Check engine oil that the water is entering into the sump from a blown headgasket.
GOOD CHANCE THAT THE WATER PUMP CRAPPED OUT.Replace the radiator cap. my car has 2 bleeders on the hoses get the air out
Radiator hoses,Heater hoses,Power Steering hoses,Air Conditioning hoses,Vacuum hoses,
water pump, heater core, radiator, thermostat, hoses, belt or timing belt depends on the car to run the water pump, and coolant mechanic for 10yrs
Actually if car is not running hot and temp gauge is staying within range then car is probably fine. I've seen a few that didn't have a lot of pressure on hoses because the flow of coolant was just that good. If you have too much pressure on a hose then you may need to worry.
Radiator hoses and heater hoses should be inspected yearly and replaced when neccessary.
Put on new hoses.
after 15 minutes when i start my car water start leaking apparently hoses radiator look fine
There is no strict rules about that. You need to inspect hoses periodically. But when you have a car which is 10 years old you might need to change all vacuum hoses around the engine.
there are no pipes in any car. there are lines and hoses. there is no master drain plug. there are floor plugs incase you get water in the car. you pull those out from the bottom. but not every car has them.