I don't know why the vent would not open for the defrost, but it may be related to the fact that your heater core is blown. If your getting nothing but cold air out of the vents when the heat is on, your core is finished and if the core is finished then it is likely related to your vent not opening/switching. Something''s wrong with your heating either way.
If you mean using a window AC and installing it backwards so it rejects heat indoors, no and yes, no it does not initially, however as an AC unit has no defrost cycle, eventually the outdoor coil will frost and require defrosting, if this is not done, conceivably liquid refrigerant could enter the compressor and damage it.
Remove the glove-box door. Behind that is the heater core cover on the interior, passenger side of the firewall. Remove that cover and there is the heater core. Open the hood and look where the heater hoses enter the front right passenger area of the exterior side of the firewall. Disconnect the two heater hose clamps and you can then remove the heater core.
The heater control valve is under the hood on the passengers side of the motor and is located in one of the two garden size heater hoses entering the firewall and it is connected to a vacuum line which causes it to function. If. you want a picture go to ORielly.com and enter a search - it will give you a picture. The web site is http://www.oreillyauto.com/EW3/HomePage.do and then you will enter your information on the vehicle and search for heater control valve.
The heater core is located in the center of the dash inside the heater unit. If you look under the dash on the passengers side you will see, from right to left, a blower, the AC box then the heater unit where the core is. Also, in the engine compartment you will find two coolant hoses that enter the firewall near the center, those hoses connect directly to the heater core.
Turning on the heater allows the hot water and coolant to enter the heater core.The heater core is really just another radiator designed to extract the heat in the coolant and pass it on into the air surrounding it,in this situation the driving compartment,thus dropping the temperature of the coolant,thus cooling the over heating engine.
rad hoses route coolant to the engine to maintain operating temperature (to keep engine from overheating). Heater hoses supply the heater core (inside most vehicles) with hot water, when heater/ac temperature control knob is turned toward hot, to heat the interior of the vehicle by opening and closing a water flow control valve allowing water to enter the heater core for heat. =;)
The 1993 General Motors F-Body came optional equipment in the 5.7L LT1 small-block V8. The heater hose configuration is from the water pump looping to the right and over to the firewall. These two heater hoses than enter the passenger cabin to the heater core located below and behind the glove compartment.
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