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.

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HOMESERVICE MANUALSSUBARU2010IMPREZA 2.5I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM (HEATER, VENTILATOR AND A/C) - MECHANISM & FUNCTIONHEATER SYSTEMGENERALNOTES

2010 Subaru Impreza 2.5i, 4D Sedan, Automatic

Heater System: General: Notes

2010 Subaru Impreza 2.5i, 4D Sedan, AutomaticSECTION Notes

A semi-center type integrated air conditioning unit is used, where a high performance heater core and an evaporator core are placed in front and rear of the unit. While ensuring sufficient leg space at the front passengeres seat, resistance to air flow in the air passage is reduced, and the air conditioning system offers a low noise and comfortable environment in all seasons through its functions such as heating, air conditioning, ventilating and defrosting.
On models with automatic air conditioning, a left/right independent temperature control system is introduced to enable the driver and passenger choose a desirable temperature setting individually.

Fig 1: Identifying Heater Core, Evaporator, Air Mix Door, Blower Unit, Cool And Warm Air
Courtesy of SUBARU OF AMERICA, INC.
There are four ventilation grilles in the dashboard; two large size grilles at the center and a side grille at each side. To improve the defrosting performance, air is always sent out from the side grilles.

Fig 2: Identifying Side And Front Defroster, Side And Center Ventilation Grille

Courtesy of SUBARU OF AMERICA, INC.

RENDER: 1.0x

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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.