* Air in the cooling system: This is usually addressed by bleeding the cooling system. The process varies significantly by car make and model. Consult your owner's manual for the specific instructions. Generally, it involves locating bleed valves (often on the radiator or engine block), opening them, and running the engine with the heater on full blast to circulate coolant and expel air.
* Air in the brake lines: This is a serious safety issue. Air in the brake lines reduces braking effectiveness. You should *never* attempt to bleed your brakes yourself unless you have experience and the proper tools. Take your car to a qualified mechanic for this service.
* Air in the fuel system: Air in the fuel system can cause rough running or stalling. Often, this will resolve itself as the system self-primes, particularly after refueling. If the problem persists, it may indicate a more serious issue like a leak in the fuel line or fuel pump problems requiring professional attention.
* Air in the power steering system: This is another area best left to professionals. Air in the power steering system can damage the pump. A low power steering fluid level along with unusual noises is a good sign to get it checked by a mechanic.
* Tires: If you mean air in your tires, you need to deflate them slightly to the recommended pressure listed on the sticker in your driver's side doorjamb or in your owner's manual. Use a tire pressure gauge to ensure accuracy. Overinflating is as dangerous as underinflating.
In summary: Unless you're dealing with slightly overinflated tires, "purging air" from a car is typically a specialized task requiring a good understanding of the vehicle's systems. Consult your owner's manual or a qualified mechanic if you suspect air is trapped in any part of your car's systems. Improperly attempting to remove air can lead to damage or create safety hazards.
