Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Air Distribution
There are two sources of air available to the air distribution system:
- outside air
- recirculated air
Air distribution within the vehicle is determined by the function selector switch position. Air flow control doors are used to direct air flow within the A/C evaporator housing (if equipped) and heater. Vacuum control motors are used to position these air flow control doors. Refer to CLIMATE CONTROL SYSTEM for description and operation of each of the system functions.
The air distribution system is designed to provide air flow from the defrost nozzle when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak.
Air enters the passenger compartment from the:
- instrument panel register
- heater outlet floor duct
- windshield defroster hose nozzle
- side window demisters
- rear footwell duct
Passenger compartment air is exhausted from the vehicle through open windows or through the air extractors located in the rear of the vehicle.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.