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 conditioning: Notes
The air conditioning only functions at ambient temperatures above 0°C. At temperatures lower than this, the pressure in the system is too low and the compressor is never engaged. This setting is made to prevent ice building up on the evaporator.
The air conditioning only functions when the engine is running. The air conditioning functions regardless of engine speed (RPM) and vehicle speed. The compressor is dependent on the engine speed, the higher the engine speed the more cooling that can be provided.
The blower fan must be operating before the climate control system can be engaged.
The air conditioning system has only two positions, off and on. If it is too cold in the passenger compartment, the temperature can be controlled with the normal heat and blower fan controls.
Air conditioning is based on the same principle as that used in refrigerators.
The rear climate control unit in the seven seat XC90 supplies the passengers in the third row of seats with cooled air. For the rear climate control system to function the rear climate control system blower fan motor must be running and the front climate control system must be switched on.
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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.