Question about 1998 Chevrolet Blazer
ONly blowing on defrost and face not floor
Bad vacuum actuator or vacuum leak to the vacuum solenoids that operate the blend doors.
Posted on Nov 03, 2013
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Posted on Jan 02, 2017
SOURCE: Blend door
ok first put you front seat down and back raise steering wheel . now lay on you back with you head in the drivers floor board. look up see 2 screws remove them and the panel they hold on . look to left main wire harness needs to be moved to the right , up and behind it is th blend actuator 7/32 socket to remove it then manually turn the white peg , total labor 30 min
Posted on Dec 15, 2008
there are separate actuators for the blend doors. one for heat and one for cool. they work opposite and in conjuction with each other, if that makes any sense. ones open, ones close, for each different climate. sounds like the the cold one isn't opening in the rear.
Posted on Jan 29, 2009
Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..
Posted on Oct 06, 2009
first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.
Posted on Jan 22, 2010
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Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)
Disconnect the electrical connection at the blend door actuator (#10 in pic below).
Fig. Blend door actuator and related components
Remove the blend door actuator mounting screws from the HVAC module.
Remove the blend door actuator as an assembly with the actuator cam.
Fig. Remove the blend door actuator mounting screws from the HVAC module
Picture of actuator:
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