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There are a few things that can cause this problem.

1. Check your antifreeze level and make sure there are no leaks in the cooling system.

2. Check the cable that connects the temp lever to the heater control valve. Make sure it's connected on both ends.

3. Check the heater control valve to make sure it works properly.

4. Check the thermostat and make sure it's not stuck open. Do you get any heat at all? If you get heat only when the car is fully warmed up and at a standstill, but not when you are moving, then the chances are you have a bad thermostat.

5. One last thing. Make sure no one bypassed your heater core. If the heater core was leaking at some point, and someone wanted a cheap fix, bypassing the heater core is the cheapest fix and the car will still run normal.

Good luck.
 

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I think he meant bleed the system after you are done flushing it. Fill the cooling system with 50/50 antifreeze and run the car with the radiator cap open until the car reaches normal operating temperature. Make sure no there are no more air bubbles, then cap it. Make sure the overflow bottle is filled to the max line. Use water to rinse off any antifreeze you might have spilled and recheck the overflow bottle in the morning when the car is cold. If the overflow bottle is low in the morning, fill it to the max line and you're all set.
 
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