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Q: heater doesn't always work on 2001 Toyota Celica

The heater doesn't always work. Sometimes it will come on after driving for a while. I have checked the water level and the leaving water line out of the heater is cold. What could it be?
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Does the engine warm up completely? I'm wondering about the coolant thermostat being defective and allowing the engine to run too cold. Another thing is that there may be a problem in the heater control module in the dash or that the blend air door actuator is not working. It's also possible that the heater core is plugged or there's a blockage in the lines to or from the heater.
You may need a Toyota specialist for some help on this.
Here's a directory link for you:
http://repairpal.com/toyota-repair-in-college-station-texas
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