How is it failing? leak, plugged etc.? There is a technical service bullitin regarding this : # 01-15-6. Essentially it has to do with most Ford products. There may be a ground problem, or lack of coolant flushes. You can get the complete service bulletin at this address: http://www.alldata.com/recalls/
A Ford Mustang does not have a heater coil. You must be thinking of your home HVAC.
its got toothpaste in the carby
It rusted out
Check the resistor pack on the evaporator case under the hood
a bad water pump could cause low heat. The heater uses the coolant from the pump to generate heat.
low water, bad thermostat, vacuum door not working, clogged up heater core, heater valve broken........
windshield leaking heater core or heater core hoses.
97 mustang! would
Your heater relay switch may be bad
I would check all the hoses if they are all tight I would go ahead and replace it due to age.
There are many reasons why the anti-lock light would turn on in a 1994 Ford Mustang GT. One reason are bad ABS sensors.
the heater core could be pluged or the heater control valve is stuck closed
It can do far worse, such as destroy your engine block. I wouldn't worry about your heater core, I would worry about your Engine.
Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.
Heater hose or heater core.
no.....the heater would have to be leaking
low coolant? Bad thermostat? Climate control not sensing proper temperature? Heater core plugged or restricted? Heater core airbound?
Pressure test the convertor.
Condensation Or the tank rusted out
Fuse, switch, speed resistor or motor.
No, that would have no effect on the heater system.
Need to know what it is not doing, post more info.