Depending on how old your water heater is, it will usually be one of two reasons. Reason #1: There is a "relief valve" bad on the unit. A relief valve will almost always have a 2-3ft piece of copper or pvc tubing attached to it on the side of the tank. This valve typically has a small metal tab/lever in the center of it that can be swung up 90degrees in order to release water pressure buildup by a serviceman or installer and allow the tank to breathe properly for water drainage of the tank. The good news is, you can easily replace this part for around $20 along with some Teflon tape-if you are capable of basic Plumbing. You usually can obtain a replacement valve at your local Ace Hardware or DIY center...if you cannot replace this item yourself, plan on having around $100 in a professional to drive to your residence and complete the work. Reason #2: If the tank is pushing 10 years of age or even older, the materials of the unit could be failing due to rust,corrosion, and damage from minerals in the water supply. Most often these leaks will be found close to the bottom or underside of the tank. Another possibility is that the tank itself is not leaking, but rather the connections into the top of it, the shutoff valve for the water(located usually within 2 feet of the unit) or any other pipe connections within close vicinity of the unit. If the relief valve is still closed and not leaking and you cannot detect a leak from the bottom of the tank, then take a look at all other piping above and around the heater. Matt G-10 yrs experience as HVAC tech/installer and water heater replacement
you could have a heater core leaking or your windshield is leaking and the water is running down behind the dash and onto the floor.
Are you running the air conditioner? If the drain line is plugged, it will leak water (condensation) onto the passenger side floor.
Maybe a bad heater core
overfilling
Coolant leaking onto the floor of the passengers side or out drain tube for a rupture no heat for a blockage.
There is no drain hose for the refrigerant (134a) as this is a gas. There is a drain hose for water that is created by the evaporator and that is located on the passenger side of the engine compartment, near the floor boards. Unless it is plugged with debri such as leaves, water will drip there onto the ground.
You know the heater core is bad when your truck leaks antifreeze onto the floor of the passenger side.
Antifreeze leaking from the heater core.
The air conditioneer drain is probably plugged. or the drain has been icked and is disconected from the pan so it is draining directly onto the floor
The A/C drain plug is clogged. When it rains the humidity is high and the A/C will remove the moisture in the air. If the drain is plugged water flows to the passenger side through the blower motor and onto the floor have the drain plug cleared or you will be replacing your blower motor on a regular basis. Until then do not use A/C or front defrost setting.
no it could be clogged what type of vehicle is it? does it use dexcool?
By finding and repairing the leak.