Coolant leak. have coolant leak. looks like pump so i replaced it. did not fix the problem. cant see the cause

Water pump bad

Pressure test water system,,,,,should show where leak is

see this causes and fix it. God bless you
Water pump -- A bad shaft seal will allow coolant to dribble out of the vent hole just under the water pump pulley shaft. If the water pump is a two-piece unit with a backing plate, the gasket between the housing and back cover may be leaking. The gasket or o-ring that seals the pump to the engine front cover on cover-mounted water pumps can also leak coolant. Look for stains, discoloration or liquid coolant on the outside of the water pump or engine.
Radiator -- Radiators can develop leaks around upper or loser hose connections as a result of vibration. The seams where the core is mated to the end tanks is another place where leaks frequently develop, especially on aluminum radiators with plastic end tanks. On copper/brass radiators, leaks typically occur where the cooling tubes in the core are connected or soldered to the core headers. The core itself is also vulnerable to stone damage. Internal corrosion caused by old coolant that has never been changed can also eat through the metal in the radiator, causing it to leak.
Most cooling systems today are designed to operate at 8 to 14 psi. If the radiator can't hold pressure, your engine will overheat and lose coolant.
Hoses -- Cracks, pinholes or splits in a radiator hose or heater hose will leak coolant. A hose leak will usually send a stream of hot coolant spraying out of the hose. A corroded hose connection or a loose or damaged hose clamp may also allow coolant to leak from the end of a hose. Sometimes the leak may only occur once the hose gets hot and the pinhole or crack opens up.

There is absolutely no way possible that the air con unit is going to cause an engine coolant "leak". The air conditioner can cause the engine to overheat if the fans are not working properly, but you will see coolant coming out of the radiator cap if it is overheating.

To find a coolant leak you just have to look for it while it is leaking. If you can see it dripping out on the ground, then you should be able to follow it up to see where it is coming from. Cracks in the plastic radiator tanks are common in all Honda vehicles. These cracks can have the characteristic of only leaking after reaching a certain temperature. You will probably have to remove the plastic shrouding from under the vehicle to see many of the leaks that can be coming from the front radiator area.

Water pumps can also leak at only certain temperatures. Sometimes they can fool you also because there are channels on the back of the pump that will direct coolant away from the water pump/ timing belt area in the event of a leak. It can look like it is leaking from the side of the engine that is away from the water pump. Again, you have to LOOK to see where it is originating from.

CHECK AROUND WATER PUMP AREA.AND THERMOSTAT HOUSING FOR LEAKS.THE MECHANIC WHO PUT THE WATER PUMP ON MAY FORGOT TO PUT SEALANT ON BOTH SIDES OF THE WATER PUMP GASKET CAUSING LEAKS.LOOK AROUND THERMOSTAT HOUSING FOR LEAKING.IF THERMOSTAT SEAL WAS DAMAGE DURING INSTALLATION IT WILL CAUSE LEAKING.IF ALL LOOKS GOOD CHECK FOR COOLANT LEAKS AROUND RADIATOR .CHECK RADIATOR TOP AND BOTTOM HOSES FOR LEAKS AND CHECK HEATER PIPES AND HEATER CORES HOSES FOR LEAKS.IF ALL HOSES GOOD.CHECK FOR LEAKING CORE PLUGS.

Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE

check all the hoses. next, check the water pump, should be behind the fan. If the bearings have gone bad in the water pump, it can sometimes leak coolant everywhere.

It's a 99% chance of water pump leak or the housing at the timing chain that the water pump sits on.
Water pumps can and do leak one minute then seal themselves.
A cheap fix most use is go to a 7 lb pressure cap on the rad.

You'll have to get under the car and look. Could be frost plugs, block heater, head gasket... lots of things. But you have to see where it origionates. It could run a long way before it gets to the ground by your right tire.

need to check the color of your oil. most causes of this kind is rotted out extender pipe from the water pump to the radiator hose connection