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There are several reasons why your heat may not work. First your coolant system must be full with NO AIR pockets. There is a bleeder valve for the coolant system, in the area of the coolant recovery bottle, by the strut tower and the firewall. Have the vehicle running and open the valve, be careful coolant can be hot. Make sure you are full of coolant by checking the recovery bottle. If nothing comes out of the vent then you need to wait till coolant comes out.
Another problem could be the heater control valve and or the thermostat. They are in the front center on top just under the cover and the air intake.
The water pump might or the thermostat housing might be leaking, creating a leak that will allow air to enter. The older style of pumps were well known for leaking.
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