Heater does not turn on

Possible causes, flat battery, faulty alternator, coil or starter motor,though sounds more like power problem, do you have power to lights, radio etc when key is turned on even though nothing happens.

would need to see it ,sorry but ford focus is showing for model and these earlier ones have a starter solonoid in the fuse board and its possible this has failed but dont ask me which one look in the manual and find it then test for current to the relay in case the switch on the back of the ignition lock has failed ,doesnt happen very often with the fords unlike a VW .But ? i have known the relay to fail on this model quite a few times .also check for the small wire that goes to starter motor ,its easy to do on a focus as the starter motor is at the front

The heater resistor has probably gone out. It should be located in the blower housing.

Sounds more like a vacuum hose has fallen off the selector valve on the in dash heater / AC controls

probly the switch is burnt-it happens when the blower motor gits old and draws too many amps---so replace blower at same time or else same issue again--and while u gut dashboard all apart inspect ac evaporator and heater core-theyr aging too

check connection at starter itself.

If everything else on your vehicle works, the first thing I would do would be to take the starter off and have it tested. If you are jumping the poles on the solenoid and nothing is happening, the problem is most likely either a short between the solenoid and the starter, or the starter itself. Also, if the starter is loose, it can loose it's ground to the motor.

Replace the Resistor located near the blower motor.Under the dash. It may be a little hard to get to. it has a plug of four wires and a couple of screws you have to remove. The reason your other problems are happening is because you disconnect the battery and the Computer (ECU) deprograms itself .

You need a blower motor resistor,and the heater blower motor should be checked for high amp draw. check Napa for the part or go to Dodge..prpbably about 60.00 dollars.

If you are getting power to the unit will need to replace the blower unit. Try putting an independant power supply to the motor to see if it works. If the blower motor still won't work then you will have to source a replacement.