heater on 2001 Toyota Celica

The heater will not heat while running around in town but if out on the highway it will heat...does it have a heater control valve .... does the water run through the heating coil all the time???

by in College Station, TX on December 28, 2010
2 answers
ANSWER by on December 28, 2010
There is no heater control valve listed in the parts listings that I have but there is a heater control unit listed. that is where I would focus my inspection of your issue. How is the coolant level ? How clean is your coolant? You could have a restriction that takes more flow to over come.
ANSWER by on December 29, 2010
If the coolant is full there could be a blockage. The coolant runs from the water pump through a steel pipe the into the heater core. The steel pipe can rust inside and become clogged. The heater core it self can also be clogged. As the engine rpms increase so does the flow. Let me know if I can be of help
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