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.
Cool down passenger compartment
Turn on air conditioning compressor with "A/C button" at a vehicle interior temperature of 45 °C (measured at the head restraint).
On vehicles with MAX-AC button:
- Activation of MAX-AC (= maximum cooling power)
On vehicles without MAX-AC button:
- Set maximum cooling power by means of following steps:
- Setting minimum temperature
- Blower setting maximum
- Stratification maximum cold (4 blue bars)
- Only ventilation open
- Close remaining flaps (air outlet only from center fresh air grille, left and right)
After 5 minutes measure both ventilation temperatures with a thermometer at the same time (fresh air grille center, left and right). The measured temperature must be ≤ 16° C and the difference between right and left may not be greater than 2° C.
If one or both temperature specifications is not reached DRAIN OFF HEATING AND AIR CONDITIONING SYSTEM . Measure amount of refrigerant drawn off.
If drawn-off quantity does not correspond to specified fill quantity: supplement refrigerant and repeat test. See A/C SYSTEM, REFRIGERANT AMOUNTS .
If capacity is correct, continue troubleshooting by pressure measurement.
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.