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.
If you have lost a sufficient amount of coolant this will stop the heater working because there will be no hot water in the heater rad.
There could be multiple reasons why a heater would stop working in a truck. There could be low coolant or a bad fuse to make a heater stop working in a truck. The best way to find out the reason is to take it to a certified auto mechanic.
Could be a plugged heater core. Check the engine temp guage. if it is getting warm, your heater core could be plugged or restricted.
If the air conditioner in a Mitsubishi Legnum is not working, there could be a blown fuse. There could also be a loose cable, or a problem with the heater motor.
the heater core could be pluged or the heater control valve is stuck closed
The heater core could be clogged up.
You have to be more specific. What is not working?
If you are leaking coolant and there isn't enough to circulate into the heater core, perhaps the radiator cap could be partially responsible. Otherwise I'd suspect the thermostat, the heater valve or the water pump. But then, if it's the water pump the engine would probably be overheating.
Check the thermostat, also there could be a heater core issue...
Could be your fuse, blower, heater core,loose ac belt, thermastatt or low coolant.
Could be low on freon,
Look for a leak in the heater/defrost system. Most times it is caused by a minor water leak in the heater system. Steve
Your car could be low on antifreeze or your heater core could be clogged. With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
If you are absolutely, positively sure that your coolant level is not low......then your heater core could be plugged. Or the control that turns the coolant flow on/off to the heater isn't working. Make sure the control is working, the flush the radiator. Should cure the problem.
could be thermostat or heater fan if you can hear all the speeds on the blower motor working then it could be your thermostat but your heater core might be plugged as well
sounds to me like your blowe moter is shorted out. u can use a test light to check for power at the motor,if you can also pull fuse out of fuse box to check fues BUT the blower motor will notstop heater working if no heat ,it is your heater core
Blower motor not working: could be the electric motor, or A fuse, or A short. Blower motor working: could be low engine coolant, or A stoped up heater core, or loss of vacumme to the inside of the car from the engine, or A bad water pump, or A bad thermostat.
Thermostat stuck open or a clogged heater core. Service and flush the cooling system and replace the thermostat.
Low coolant level, or a plugged heater core.
One reason that the heater will not work in an Audi A4 is that the fuse is blown. Another issue could be a short circuit in the wiring.
Assuming the blower is working, the reason for no heat could be, low on coolant due to leak in coolant system, thermostat stuck open, heater core plugged or temperature blend control NG.
the air conditioner and heater are two separate things.(not connected) ;) it may have a fuse. or the it could just be bad.
Could have a clogged line feeding the heater core. Disconnect return hoses from the heater core and verify coolant is flowing through the core.
restricted flow,water pump starting to fail,thermostat is stuck or not opening fully,heater core is restricted,in or out lines to the heater core could have a blockage...