1. That probably indicates that the glass liner of your water heater is broken. You'll need to replace the water heater. 2. OR, if the leak is coming from the drain spigot, it could mean that your valve isn't fully closed. If that is the case, turn the knob all the way closed (to the right in the US) and watch for dripping. If it stops, it isn't the liner. If it continues to drip, see step 1.
If water is dripping out of the heater core it is about to go.
your heater core is going bad
Possibly ruptured heater core. if you are losing coolant-check it out.
I had the same problem with my caprice a few weeks back. The water shouldn't be dripping from the back, it should be dripping on the rear passenger side floor board. That is caused by the heater core being bad, which is causing the water to seek through the carpet and drip out the back floor board.
If the water is dripping, I would replace it just to be safe. It doesn't cost much money.
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Your air conditioner may be faulty if it is not dripping water.
if a small amount of water is dripping it is normal condensation from running an engine
Water leaking from the seal
If something is "dripping", then it usually means that water is coming from it slowly and intermittently. For example, if a wet towel is hung on a rail, it would be "dripping" water.
Yes, gas water heaters often drip after they are put into service after a prolonged shut-down, but it is not because of the pilot light. When the main burner ignites below a tank of cold water, the moisture contained in the gas flame will condense on the outside of the tank bottom and the flue that passes through the center of the tank. Once the water is hot, the water heater should stop dripping and the moisture below the water heater should evaporate. Continued dripping may indicate a leak and the water heater may need to be repaired or more likely replaced if it is older--more than five to seven years old.
No dont even think about putting a cap on it, its dripping for a reason, call a plumber to fix it, a hot water heater is a dangerous appliance and should not be dealt with lightly. If you have a drip, but can't fix it or get a plumber out right away, use a garden hose to route the water to a drain nearby. Most drain valves are threaded with garden hose fittings.