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Blowing hot air when set to A/C is almost always a stuck blend door, dead blend door actuator, or a cracked or disconnected blend door actuator vacuum line. The blend door is inside the a/c ducting under the dash, but the actuator will be accessible outside the ducting.
THEY HAVE A BIG PROBLEM WITH WHAT THE CALL A BLEND DOOR ACTUATOR MOTOR ASSY... THIS IS AN ELECTRIC MOTOR ASSY THAT MOVES A BLEND DOOR IN DIFFERENT DIRECTIONS TO DIVERT AIR THROUGH HEATER CORE OR THROUGH AC CORE.. THIS IS VERY HARD TO REPLACE BECAUSE IT IS BEHIND THE DASH NEAR FIRE WALL... THE BOOK CALLS FOR 6 HOURS LABOR TO REPLACE... HAVE TO PULL COMPLETE DASH OUT
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