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It is possible that the thermostat is deffective and it does not open at the right temperature thus it does not let the coolant get warm enough to give you heat (the thermodtat is supposed to open at 180 degrees). You can try changing the thermostat with a new one. A thermostat is not very expensive and very easy to replace. Just remove the two bolts holding the thermostat housing. You don't even have to drain the whole coolant. when you remove the two bolts just place a pan under the engine and you only lose about a pint of coolant. After you replace the thermostat just top up the rad with pink coolant from Toyota. Hope this helps.
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