If its a gas water heater then it may be a bad thermostat or the temperature is set very low or in some cases the wind from a storm could blow the pilot flame out and in time the water turns warm then cold.
If its a electric water heater it could be that the bottom element is not working or the dip tube is damaged or the set water temperature is set on low.
If the blower is good then the problem is coolant. Something is stopping the warm coolant from the engine from reaching the heater core inside the car. This might be thermostat, heater control valve, blocked heater hose or a blocked heater core. I would suggest letting the car warm up and checking the heater hoses (2) by hand to see where the hot water stops. If there is no hot water at all it is probably a thermostat problem.
Any heater that only blows luke warm air isn't getting warm or hot water to the coil. This sounds like a problem with the thermostat not closing, and allowing the engine to heat the water properly for the heater.
you should probably check your water in your radiatior and if it is full you might need to replace the cap. If neither of thise are the problem it may be your heater core which sucks or something electrical.
Your thermostat is most likely bad. It controls the flow of warm water into your heater core which warms your air. Its a common problem in winter and an easy fix.
Yep. The water heater will warm up the area in which the water heater is located. You will find out later if it is sufficient heating.
Actually mushers have to carry lanterns food warm water a heater to warm the water and etc.
I assume the blower motor is going. There might be an air bubble preventing the warm water from circulation through the heater core, you might have a build-up of sludge doing the same. Or maybe there's something broken in the valves in the air ducts preventing the heater from releasing warm air into the car.
First change out the themostat. If problem persists , it most likely is the water pump. Too much clearance around the impeller causes slow water movement and does not circulate to the heater core properly.
After the engine is warm up and hot - feel the water hoses to the heater and test if they are HOT- HOT. NO?- The water valve may not be letting hot water go to the heater core.
Not much, it gets warm as everything else within the heater's range.
It gets warmer and warm air always rises.
electrical energy is converted in the heatert to heat energy to warm the water