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Its a faulty rear control switch (a/c or heat) on the dashboard. It works by vacuum and when it doesn't work correctly it defaults the rear heat. I just had this repaired on my '98.
Likely, your blower (fan) is out.
The question you ask is too involved for a proper answer. You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
The moveable "baffle" inside the dashboard is not redirecting the air flow as it should. It's operated either by vacuum or an electric motor, in either case, repair is going to require the removal of the dashboard.
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch at the dash
I have the same problem with my 97 jeep. I'm thinking that maybe a hose going to the vents has come loose, because I can hear the fan motor running and I'm getting a small amount of air out the vents in the dashboard area.
Radiation heats up a dashboard kind of a like it does the earth. when light from the sun passes through the window and hits the dashboard, the dashboard absorbs the heat energy, and re-radiates it into the air. this new energy is not as strong as the radiation from the sun, and doesn't pass through the window as well, and is trapped in the car. the trapped energy is what causes the dashboard to heat up.
how to take out the heat on the dashboard
The heater blower may not be working properly. Without the heater blower working, the air will not come through the vents.
i own a 90 olds 98 it had the same problem u have to take the bottom part of the dash off and check for any vacume leaks
Yes. The heater core provides the heat which blows out your vents. The heater core has engine coolant flowing through it (it is like a mini radiator) which creates the heat which warms the air that comes out your vents. If you have low coolant, there may be no coolant circulating through heater core, thus causing cold air to blow out vents.
You don't. Motors have vents to dissipate heat. Although you can see the windings through these vents, don't cover them or the motor will overheat and burn up.