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You are describing the classic symptoms of a blown head gasket from the cylinder into the water jacket. This causes loss of compression in the affected cylinder and also injects hot gases into the cooling jacket resulting in overpressure and overheating of the coolant. Perform a compression check of all cylinders and if any are appreciably lower than the others, you are looking at some major engine work.
You will have to get under there and run your fingers across the line. Most likely that it has corroded in one spot and is dripping down the line. Not a tough job to do.
follow ur lower radiator hose or your heater hoses from the fire wall they will lead you to the water pump which is usually located on the front of the motor. also 9 outta 10 times the fan is attached to it gl
at first i just bypass the heater core assem. go from the thermm. housing to the head nipple. if you put your heat setting to hi setting all your coolant will pour out that nipple with no hose. if you drive like that BOOM! engene blows the heater hose assembly replacement for that is $90+tax and thats bs. ireplaced mine with 2 tees it works great! it runs cooler than it ever has and the heater works when you need it. that assembley has a thermal crossover valve in it and i find no reason for it other than the heater may work a couple min. sooner.And or the coolant that ain't worth $90bucks+tax to me.i can wait a couple min, longer for the heater to work i used the tees to maintain water flow through the head nipple back to the rad,when heater is not in use. incase that was the purpous of the thermal valve crossover. i could find no one who could tell me its intened purpous at any parts store or even the GM dealership.
look in engine compartment from underneath- if water coming from directly over crank pulley(big one closest to ground) ,yes its the water pump- could also be lower hose(radiator hose closest to ground),if leaking up top - could be other radiator hose- if leaking near fire wall- heater hose- ?where is the water appearing?
The AC condensation drain tube is also located on the passenger side fire-wall towards the bottom of the fire-wall, it is there to drain the condensation from the evaporator/core plenum so that it does not flood the passenger compartment floorboard with water and it can easily be viewed from under the vehicle, and if it is cool clear water that is leaking and not hot coolant then you have no problem and that is a normal condition when the AC is operating.
If it was a coolant leak the cooling system would be low on coolant, and the engine would run hot when the coolant gets low.
Have you cleaned the spark plugs? they will surely be filthy after a headgasket failure... maybe even cracked by the water going on the hot plug... I recommend changing the plugs before trying anything else.
clean out the drain **** for the a/c that is located on the firewall in the engine compartment.black hose about 2"-3" long usually L-shaped.passenger side lower part of firewall
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