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Which actuator to replace lower upper or right main

Tiny
DRIGO1980$
  • MEMBER
  • 2007 BUICK LUCERNE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,478 MILES
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.
Monday, October 23rd, 2017 AT 7:25 PM

2 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Sounds like you have a bad passenger side blend door actuator.
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Monday, October 23rd, 2017 AT 10:48 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,454 POSTS
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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Tuesday, October 24th, 2017 AT 2:22 AM

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