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Well the default setting for the a/c is defrost, and I might be mistaken on this but I think that bypasses the heater core from the blower motor to the defrost vents. Could there be another door in the heater case, I guess is what I'm trying to ask. Something in there left over from the old a/c days?
You hear the blower motor on fast and furious? Any chance the fan blade assembly came loose on the motor shaft? If the doors are vacuum operated, a hand vacuum pump might help you. Also check if the switching controls for the vacuum signals are not linked to the unplugged a/c wires.
these are two diff systems working of the same control. Heater first, do you hear the fan running with the heater on all speeds, does any air come out of vents? Is it hot air? If you have air flow can you adjust it to defrost or floor?
As a mechanic i am leaning towards a bad heater core. The core translates the heat from the cooling system into hot air for the cabin. Often times if the core is bad it leaks. check under the carpet, be keen on the smell of the antifreez and keep an eye out for foggy windows. Good luck and i hope i was able to shed some light on the situation.
your heater core could be plugged if your anti-freeze color is a brownish colour , most likely your heater core is plugged also when you move the direction for heat control can you hear the blendoor move if you can then again your heater core may be plugged and if it is plugged flushing most likely wont fix it, if you don't hear the blendoor motor move the blendoor motor or the door may be damaged
Check your your radiator cooling fan should come on at about 220 deg. and off at about 210 deg. at idle with a/c off, if it stats to over heat turn a/c on, fan should come on right away, if it dont check voltage at fan motor, if you do have voltage, you have a bad radiator fan motor, more then likely the reason it don't over heat while driving is air is being push through radiator where it cool's the coolant before it goes back into the engine, at stop's no air running through and never cool's coolant .
The fan only working on high is due to a defective blower motor resistor pack which must be replaced. No heat can be a clogged heater core, defective heater control valve, or thermostat stuck open. On a 8 year old car it is time for a full cooling system service. Drain, flush, replace the thermostat, and refill with a 50/50 mix of antifreeze and distilled water.
You might have to purge the coolent system cause when you change stuff like that you normally have to bleed the the colent system. So what you have to do is run the car untill your temp gets to 195 degrees the cut the car off and let the coolent drain down and then refill and geep doing that untill you have heat.
Chances are your heater core is plugged up from a dirty cooling system. You need to have a flush and fill and replace your thermostat. Your AC will run fine because it is independent of your cooling system.
Another thing to do is buy a Haynes or Clinton's repair shop manual at your local AP store for your particular vehicle. Then read up on it in the trouble shooting section or the step by step RR section. You can purchase these at your local Auto Parts store or buy them on line at ebay burdfrenzy