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your leak is likely in head leaking into the spark plug ignition area and burning of once vehicle is running check plugs for moisture before motor is hot, also can seal using blue rhino at auto zone I used on 6 vehicles and sealed all of them.
SMOKE UNDER HOOD COULD BE COOLANT LEAK FROM RADIATOR ITSELF OR CHECK FOR LEAKING TOP RADIATOR HOSE AND CHECK FOR LEAKING BOTTOM RADIATOR HOSE.LOOK UNDER THE HOOD IF COOLANT BOILING OUT COOLANT OVERFLOW JUG ENGINE OVERHEATING FROM BAD THERMOSTAT OR BAD WATER PUMP.CHECK FOR COOLANT LEAK AT WATER PUMP WEEP HOLE.IF SO WATER PUMP NEED REPLACING.ADD MORE COOLANT UNTIL LEVEL CORRECT.TRY LOCATE LEAK. IF CAR OVERHEATED AND BOILED IT OUT. SMOKE UNDER THE HOOD CAN ALSO BE CAUSED BY LEAKING VALVE COVERS WHICH CAN BE FIRE HAZARD IF OIL LEAKS ON HOT EXHAUST MANIFOLD.
The answer is a definite yes to the second opinion. I don't know how they mean when they say the pump is not functioning properly. It may be leaking out of the waterpump seal in which case you have an explanation for your water leak. That would be a valid cause for replacement and doing the thermostat at the same time is a good idea. However, When they did not say the cause of the leak was a bad waterpump seal I would see a red go up the pole. I would ask them for a further explanation and then top off the expansion tank and go for the second opinion. Coolant does not last forever and topping off the coolant expansion tank is not cause for concern but if it is an every day or weekly occurance then you must find the leak.
With the engine cool open radiator cap. If the level is low you are losing coolant. Go for a 30/40 dollars, radiator compression test. Might be a bad radiator cap seal, water pump leak cylinder head gasket. If the coolant level is in top, then there are many other reason.
If you have coolant leaking from under the water pump,you will more than likely need a new pump. Water pumps have a bleed hole built in to show if the pump seal is gone. If it is not leaking from the bleed hole, it may be from the gasket that seals the pump to the engine or it may be leaking from somewhere above the pump and collecting at that point. Good luck Moe
you have a leaking water pump... there is a "weep" hole at the bottom of it and when the inner seal goes bad it starts slowly leaking out of it as a warning sign to replace it. It will do that for a few days, or months even, until it starts leaking profusely.
your water pump is leaking and most likely you had a small oil leak under there also and now the coolant is washing it out, don't go too long with these leaks because your timing belt is under there and is getting soaked with oil and and coolant this will break or slip off causing major engine damage to result (i.e bent valves) good luck and please rate -jeff