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Lot's of these problems going around. First thing is to locate where the coolant is going. Is it leaking onto the ground or going through the engine and out the exhaust? As for no heat, Check to be sure you have enough antifreeze. Pure water can cause the engine to not warm up and result in no heat. Air in the system can also cause these problems and must be bled out through the air bleed screw on top of the engine. On most of these cars it is towards the passenger side front on a metal pipe. It's a funny looking fitting with a flat head screw on top and a hole on the side. With the system full and the car running, slowly open the screw until bubbles come out and continue to bleed until you get no more air out. Let the car run to reach normal running temp and try bleeding again and again until you can't get any air out (they're funny that way). If you can not locate coolant leaking onto the ground it's due to a blown head gasket or a cracked head.
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.
If it is pure water, it is probably condensation from the air conditioner. If it is engine coolent, it could be a slow leak that will take time before it is low enough to overheat. Take note of the color and feel of the fluid. If it is orange or green and oily, it is coolent. If it is water, than it is condensation, unless you only put water in your radiator.
Check all coolant hoses for leaks, the coolant/water has to be going somewhere. Fill the engine with coolant, run engine til warm and look under the vehicle for signs of coolant on the ground. The best resolution is to pressureize the system and check for leaks. Your blowing cool air because there is not enough water in the heater core to properly heat.
It is surely a leak ,the coolant can go anywhere like apart from leaking,what is happening is when you are driving it leaks because there is more pressure in the radiator and it leaks somewhere ,why you don't see it,it is because the coolant is so hot and when the coolant when it leaks then hit the engine that is also hot,this make the leak coolant to evaporates very quickly that why you don't see it.Well what you have to do is top the coolant level,let someone start the engine you lift the bonnet standing in front of it,then tell the person inside the car to accelerate up 3000 rpm for near 10 minutes,then you watch carefully the radiator,hose and all the connection for the cooling system you will surely find the leaks where it comes from.Hope that clear your mind and solve it.
I am guessing that you may have mold (green) in the water coming from your Air Conditioner or from the water channels where the water flows from the car vents to the ground. Usually green is the coolant. Could also be a prankster the poured some lime flavored pop/soda under your car or one leaked in the trunk? Did someone else park there and you are seeing their leaked stuff? Without more info, this is just wild guesses. Where is the leak seen - inside the car? under the engine? floor of a garage? outside in the street? Maybe even windshield washer fluid was that color if it spoiled?
It sounds like your evaporator drain hose is clogged or kinked. You will find the hose in the area under the hood near the bottom of the firewall on the passenger side of the car. Check to make sure the hose is not obstructed with debris or other types of obstructions.
If this is fine, you may be getting coolant/antifreeze from the heater core, and not water. Are you losing coolant?
I hope this helps.