Leaking air sound from motor

Your vehicle is now very old and will develop such issues. The blend door is operated by a vacuum motor, and may get stuck if in need of lubrication or if there is a vacuum leak under the dashboard (especially if your automatic brake release is leaking vacuum... very common issue).
Check for vacuum leaks, and lubricate the blend door (behind the glove compartment).

Sounds to me that you might have a leak in the line. Those heaters are all Vacume actuated.

Ok this sounds like troubling problem first the clip the hooks to the fan motor just below the glove box see if the clip is on it and intact be the wires could be crossed on the wrong poles from the fan motor.
Also this sounds like you are having a damper air mix door problem which it as well is in the same location as the fan motor it has a little metal rod coming from it. This goes either left and right or up and down in movement which open or closes a swinging door from heat to cool make sure have someone switch from heat to cool with the engine running and see if this small metal rod moves any at all. If not this is your problem. You have a vacuum leak or the control assembly is bad.
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It sounds like you have a busted heater core hose. The only solution is to pin point the leak and replace the hose that's leaking. There are usually two heater core hoses coming out of the firewall on the passenger side of the vehicle. Examine both of them carefully for a blowout. Many times when a hose goes bad or is getting ready to go bad, it will have some swelling or deformation around the end of it. I hope this helps.

Sounds like the heater core is dirty, take the fan motor out and reach inside the air vent, you can feel the heater core (scratch your finger nails on it), is there a bunch of debri on it, I found this to be a problem when there is a leaking heater core, (coolant leaks onto the core and dust and dirt attaches to it restricting air flow and reducing heat. Also you might want to flush the entire system and replace the coolant.
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CHECK HVAC FUSE AND BLOWER MOTOR FUSE AND RELAY.IF ALL IS GOOD CHECK FOR POWER TO BLOWER MOTOR.YES BLOWER MOTOR DEFECTIVE.IF NO POWER GOING TO BLOWER MOTOR AND ALL FUSES AND RELAY GOOD.YOUR HVAC CONTROL SWITCH IS BAD OR YOU HAVE BROKE OR LOOSE WIRE AT CONTROL SWITCH.

It sounds like you may be leaking coolant and are low on coolant. Low or no heat is a sign of the coolant being low. Vehicle can leak coolant from multiple locations. Top off the coolant level and see if the heat returns or gets better and get back to me.

Other causes could be a clogged heater core, Temperature door motor/door not moving, cylinder head gaskets, engine block, thermostat.

It sounds like one of two things could be causing your concern. One... your coolant level is low and not circulating through the heater core which could possibly have air trapped in it. Two.. your mix door may not be operating properly. Sounds like the second one to me.

Check your overflow tank to see if it has coolant in it. This vehicle has rear air meaning coolant has to travel to the rear to heat the compartment. Air will have to be purged from the coolant system. WIth the engine cold remove the radiator cap and check the level in the radiator. If there is no coolant present there is a possibility that you have a leak somewhere in the system and it will need to be pressure checked.

Whether you have AUTO or MANUAL air the mix door has a motor mounted on it. If that motor does not work you will experience the concern that you have. Turn the knob (on manual models) from hot to cool to hot and listen for air sound change. On AUTO models change the temperature from 90 to 60 to 90 (make sure you are in manual mode so the mode doors don't change). There is a slight restriction on heat because the air has to travel through the heater core

this sounds like a air temperature control blend door motor issue.

these guys are retarded, could be the fuse, could be the relay, could be the fan control unit, could be the resistor, could be the fan motor itself. if the heater core was leaking, you would still have heat, you would just smell coolant, if it was leaking enough to not have heat you would see it on your floorboard.