Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Hello, this system uses vac actuators to move the mode doors, to direct air flow out the desired positions. make sure you dont have a vac problem from the engine. there is a vac tank mounted in the left fender well that suppls vac to the heater controls. in the picture below, the vac hose runs to the fender well. if the vac hose is ok. next you will want to inspect the mode door actuator mounted under the dash on driver side. inspect this actuator for ant visible problems. finally i have seen the lowe mode door itself break and will not direct airflow to the corect postions.
Mode Actuator Replacement Removal Procedure
The mode actuator is located on the top left side of the HVAC module.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.