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.
Overview of installation
Several openings can be used:
- 14 defroster openings - leads air to the windshield and the front doors' windows for fast warm-up and demisting. The air can pass through the evaporator and the heater.
- 4 ventilation openings - blows in air directly to the passenger compartment. Vents can be set in different directions and can be closed individually.
- 6 floor vents - are located on both sides of the center console and blow out air both front and back.
- Air mix openings - the two middle openings are also used for the air mix function. Non-warmed air can be directed to these openings. For more information, see: Air mixing openings
Structure in the car
The heating system and air conditioning unit in the car are built up of three separate parts.
A.
This unit is the air inlet. The fan motor and recirculation valves are also located there. The recirculation valves are electrically operated by a servo motor. They only have two positions: fully open or fully closed. Closed means 100% recirculation. This can be set manually or with the ECC control module.
B.
The evaporator is located in this unit. The temperature sensors for the ECC-system and AC-system's temperature-controlled expansion valve are located directly on top of the evaporator. The pollen filter is located in front of the evaporator.
C.
This is the location of the heating coil, valves for air distribution to the various vents, and the valve for air mix.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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