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You don't give much info, so it's hard to give you a good answer. Do you have power up to the heater switch and after turning the heater switch to the on position do you have power to the blower? Did you check the fuses, do you have power on both sides of the fuse? if you do follow that wire and check for power at the other end of it. Some cars have a temperature sensor and the blower will not come on until the temp. is warm enough so that the blower will not blow cold air. If you track the hot lead from the fuse box to the switch, through the switch and to the blower and at any point find you no longer have power, that would be the component I would think is causing your problem. You can also check the blower by running a test lead from the positive side of the battery to the blower motor and see if it runs.
Check to see if the blower works with the heater on. Turn the control to heat and see if the fan works. First check the fuse for the blower. If the fuse is good and the blower does not work with heat on , the blower may be bad or the speed resistor maybe bad.
Check your blower motor resistor connection.Turn switch and fan on then wiggle the resistor pigtail fan should turn on if not replace resistor.These get to hot and usally melt the pigtail and loose their connection.
If it is the fan/blower that is not working (as opposed to what is coming out is cold), then the problem could be 1) fuse 2) Blower Resistor. I just replaced the blower resistor in about 15 min with a $25 replacement resistor. The unit is right behind the glove box.
If the problem is that the air coming out is cold and not hot, then the thermostat, radiator, heater core, etc... are the more likley causes.
Let the car warm up to normal operating temp and then try the heater. If the blower works for the heat it should not be a blower fuse. If the blower does not work at all, then check the fuse panel for a blown fuse. Unfortunately this will not tell you why the fuse blew. You probably have a bad blower motor. If you have climate control, there should be a variable resistor for blower speeds and that plug- in part may be burned out.
Hi: Only guessing as can't understand your statement. Think you mean blower fan selection not working, if blower fan only runs on high then resistor located on passenger side no good, which could mean fan was binding.
Check your fuses.If you have a test light, unplug the blower motor, start the car, turn the fan on, if you have power to the blower plug, the blower motor is bad. If no power, if it's not a fuse, check the blower motor resistor. Should be mounted right next to the blower motor. It is inserted into the evaporator box