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As with most vehicles, with coolant reservoir full, engine running, warmed up and hood open, feel the heater hoses with your hands. If both hoses are luke warm or cold, you may need a new thermostat. If one hose is hot and the other is luke warm or cold, the heater core is probably plugged up, in which case you can try flushing the heater core. If both hoses are hot, you probably have a problem with the temp blend door in the HVAC system behind the dash assembly.

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Q: 86 Celica gts blows no heat?
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