Manual: 2011/2012 911

Page: 179

Exercise Extreme Caution when Working on your Vehicle
The engine compartment of any motor vehicle is a potentially hazardous area. If you are not fully familiar with proper repair procedures, do not attempt the adjustments described on the following pages.

This caution also applies to the entire vehicle.

Fire and Explosion Hazards

Many vehicle fluids are highly flammable, e.g. fuel, engine oil and transmission oil. Fuel vapours can deflagrate. A highly explosive detonating gas can be formed when charging lead-acid batteries.

  • Do not smoke in the vicinity of the battery or fuel system, and do not use a naked flame.
    Also be careful of sparks, e.g. due to cable contact.
  • Keep a fire extinguisher in close reach.
  • Ensure that there are no open flames in the area of your vehicle at any time when fuel fumes might be present. Be especially cautious of such devices such as hot water heaters which ignite a flame intermittently.
  • Only work on the vehicle in the open air or in well-ventilated spaces.

Fluid Health Hazards

Refill fluids, e.g. engine oil, brake fluid or coolant, are harmful to health (toxic, irritant or caustic).

  • Keep these fluids out of children's reach and dispose of them in accordance with the appropriate regulations.
  • Only work on the vehicle in the open air or in well-ventilated spaces.

Exhaust Gas Inhalation

Engine exhaust is dangerous if inhaled.

Engine exhaust fumes have many components which you can smell. They also contain carbon monoxide (CO), which is a colorless and odorless gas.

Carbon monoxide can cause unconsciousness and even death if inhaled.

  • Only work on your vehicle outdoors or in a well ventilated area.

Hot Engine Parts, Exhaust System and Fluids

The engine and adjacent components, the exhaust system and coolant become very hot when the engine is running.

The coolant reservoir is pressurised. Hot coolant can spray out suddenly if the coolant reservoir is opened without due care.

  • Be very careful when working near hot parts of the vehicle, particularly the engine and exhaust system.
  • Before working in the engine compartment, always switch the engine off and let it cool sufficiently.
  • Allow the engine to cool down before opening the cap of the coolant reservoir and protect your hands, arms and face from any possible escape of hot coolant.

Moving Engine Parts

Hands, fingers, items of clothing (ties, sleeves, etc.), necklaces or long hair can be drawn in by moving parts, e.g. the engine-compartment blower, drive belt, etc., when working in the engine compartment.

The engine-compartment blower is mounted on the engine compartment lid.

After the engine is switched off, the engine compartment temperature is monitored for approx. 30 minutes.

During this period, and depending on temperature, the engine-compartment blower may continue to run or start to run.

Carry out work in these areas only with the engine off and exercise extreme caution.

The radiators and radiator fans are in the front of the vehicle.

The radiator fans in the front end of the vehicle may be operating or unexpectedly start operating when the engine is switched on.

  • Carry out work in these areas only with the engine switched off.
  • Take great care to ensure that parts of the body, items of clothing or jewellery cannot be drawn in by the radiator fan, engine compartment blower, drive belt or other moving parts.

Electric Shock from Ignition System

When the ignition is on, all cables and wires of the ignition system carry a high voltage.

  • Be particularly careful when working on the ignition system.