either your low on anti-freeze or the thermostat is broken. i just changed my thermostat today and i cost $11 so it won't hurt to get it replaced even if your not sure its broken.
could be the switch to turn it on or the heating unit itself, let an professional take a look at it
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Check the heating elements in the water heater. These may be bad and need replaced.
could be a bad thermostat try replacing it answer try flushing out your heater core also
heater core could be rusty and old or line to heater core could be plogged most likely old heater core
A blocked heater hose could cause a leak. A stopped up heater core could as well. Or the connector in the Windstar could be cracked.
Bad elements consume no power. A malfunctioning water heater could cause high utility bills if it is heating for long periods because the thermostat has failed and does not switch off the current when the set temperature has been reached. You should see some signs of this as in very hot water!
Yes(!) the water pump can cause problems with heating and cooling.A failing water pump is not able to properly move engine coolant - making it hard for the heater to produce warm air in the cabin.For example, you may find the heater works better when the engine is turning faster like while driving (versus just idling) - this could be a water pump with worn or a broken impeller.See "Related Questions" below for more about Taurus/Sable heating system problems
The only thing that could cause this is outside air has leaked into the house and is cooling off the pipes. If the water heater is producing the temp that is set on the thermostat, then it will come out the same temp everywhere, unless you just think the faucets are getting hotter. If your water heater is electric, the elements could be getting bad or dirty from hard water,which will cause inefficient heating. But besides this,only cold air could cause the pipes to cool.
Could have a clogged line feeding the heater core. Disconnect return hoses from the heater core and verify coolant is flowing through the core.
Central heating systems usually heat on a different system from the hot water heater, unless the main heater is a combination furnace/hot water heater. If this is the case, it could be because the outflow of hot water is greater than the ability of the furnace to heat the water.
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.