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2006 Toyota Tacoma Question: My 2006 Tacoma 4x4 4 liter engine that the heater is not warming up.

 

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lkgas, 4.0L V6, Grantsville, WV, December 09, 2013, 05:04
 Rookie

Please note, the blower is working so our first thought was the Therma Stat but replacing it did not help. It seems to work a little better when the motor speed is increased. We are thinking maybe a vacuum leak on the inner doors or maybe a heater core that is plugging up.
Any thoughts?

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