Warning: In these models of cars, the electric fan can operate with the ignition off. When working in the fan area, turn off its motor or disconnect the negative battery cable.
Warning: Air conditioning hose replacement should only be performed by a qualified technician as it requires special equipment to safely relieve system pressure. Do not disassemble the air conditioning unit while it is under pressure.
General information
1. Excessive underhood temperatures can cause the engine's rubber and plastic lines to deteriorate. Check periodically for cracks, loose clamps, leaks, and hardened materials.
2. Specific information on cooling system hoses is provided in section 15.
3. Most (but not all) pipes are connected with clamps. Make sure that the clamps where the pipes are connected do not become loose and cause a leak. If there is no clamp, make sure that the hose has not stretched or hardened where it contacts another part.
PCV system piping
4. To reduce hydrocarbon emissions, gasoline blown through the crankcase passes through the PCV valve in the valve cover to the intake manifold via a rubber hose. The gasoline mixes with the air entering the intake manifold and burns in the combustion chambers.
5. Check the PCV hose for cracks, leaks, or other damage. Disconnect it from the valve cover and intake manifold, and check for clogs inside. If the hose is clogged, clean it with solvent.
Vacuum hoses
6. Generally, vacuum hoses, especially those used in exhaust systems, are differentiated by color or colored stripes fused into them. Different systems require different thicknesses, resistance to flattening, and temperature resistance. When replacing a hose, make sure the new one is made of the same material.
7. Often the only reliable way to check a hose is to remove it completely from the car. If there are several such hoses, be sure to mark each of them and their connection points so as not to mix them up.
8. When checking the vacuum hoses, be sure to also check the plastic T-connectors. Check the connectors for cracks and the hoses where they meet the connectors for warping, which could cause leaks.
Fuel hose
Warning: When inspecting or servicing fuel system components, certain precautions should be taken. Work in a well-ventilated area and keep open flames, cigarettes, lighters, etc., or uninsulated light bulbs away from the work area. Wipe up oil spills immediately and do not use fuel-soaked rags where they may catch fire.
9. Fuel lines are usually under slight pressure, so be prepared to receive escaping fuel when disconnecting a line.
Warning: If your vehicle has a fuel injection system, the fuel system pressure must be relieved before servicing it. The procedure for relieving fuel system pressure is described in chapter 4.
10. Check all rubber hoses for possible deformation and abrasion. Pay particular attention to hose bends and connection points.
11. For replacing fuel lines, use high-quality hoses, which usually have the word Ruroelastomer (fluoroelastic) printed on them
12. Fuel hoses usually use spring clamps. After a certain time, such clamps lose their original elasticity. Therefore, when replacing hoses, we recommend replacing the spring clamp with a threaded clamp.
Metal pipelines.
13. A section of metal tubing is often used to supply fuel from the pump to the injectors. Carefully check for any bends or folds in the tubing, as well as for cracks at the bends.
14. When replacing a metal section of tubing, use only seamless steel tubing as copper and aluminum tubing is not strong enough to withstand engine vibration.
15. The metal pipes of the brake system should be checked at the points of connection with the main brake cylinder for cracks and loosening of the connection. At the slightest sign of a brake fluid leak, the entire brake system should be checked immediately and thoroughly.