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AC and Heat are two separate systems. AC is a sealed refrigeration system and Heat works from the engine's coolant system. The Blower is just a fan common to both systems. This Tip I wrote explains your issue and how to fix it..
Did you bleed your system of air???....usually a bleed screw near the thermostat housing...get allllll the air out...simetimes the heater core is at the highest oart if the system..therefore if there is air in system..thats where the air settles and no coolant will flow through the heater cire!!
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.
make sure thermostat switch working properly, the thermostate sensor sense the temperature and kick on the cooling fans on and off, also make sure both fans are working properly. assuming every thing is working properly, check the dip stick to make sure there is no water mix in the oil, another sign of leaking head gasket will also will cause the engine run a bit hotter than normal.
ok, missed the part about the rear ac working, the part that causes this is called the air temperature control blend door actuator motor, it is an electric motor driven gear drive that moves the plastic door inside the air ducking to mix or shut off the hot or cold air from the ac evaporator core or the heater core, you will need to replace it.
Sir,
Low coolant? Cooling fan not working? Radiator plugged or air flow restricted? Defective thermostat? System air bound? Water pump not circulating coolant? Defective radiator cap?
Occasional overheating, if not related to low fluid or other problems, is usually caused by a sticking thermostat.
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