I found a way to fix the actuators that cause this problem in certain cases.
Chevy blazer blend door actuator.
W manual a c control.
Skp 1571845 16124922.
Blows out of top vents only.
Torn vacuum diaphram on left side mode actuator.
Heater blend door actuator connector.
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No contol or low air vent to floor.
Is your chevy truck blowing hot air in the middle of summer.
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Chevrolet 1998 blazer 4 3l v6 heat air conditioning heater blend door actuator.
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No parts for vehicles in selected markets.
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Bevel engineering blend door actuator replaces oe 89018365 604 106 52402588 fits 1994 2012 chevrolet chevy gmc silverado 1500 2500 tahoe sierra hvac air blend control motor heater blend.
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This original part is nla from gm or ac del.