Which actuator to replace lower upper or right main

2007 BUICK LUCERNE
130,478 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
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DRIGO1980$
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When heater is turned on, it blows hot air on the driver side, but it blows cold air on the passenger side. How do I know which actuator to replace? there are three of them.
Oct 23, 2017 at 7:25 PM
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SATURNTECH9
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Sounds like you have a bad passenger side blend door actuator.
Oct 23, 2017 at 10:48 PM
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STEVE W.
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The right hand side actuator is a bear on those. GM put it inside the HVAC case. Instead of where it can be reached from outside.
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Oct 24, 2017 at 2:22 AM
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