Caution: Replacement of air conditioning system hoses should be carried out at service stations equipped with appropriate equipment for draining the system's refrigerant. Do not remove hoses or system components unless the refrigerant has been drained first.
1. High temperatures in the engine compartment have a negative effect on rubber and plastic hoses of various systems. The condition of the hoses should be periodically checked for cracks, loose connections, hardening of the material and signs of fluid leakage. The method of preventive inspection of the condition and maintenance of cooling system hoses is given in subsection 14.
2. Most hoses (But not all) attached to the connectors using clamps. Inspect the clamps and make sure the connections are tight. If the hose is attached to the coupling without a clamp, make sure it is securely seated.
Vacuum hoses
3. As a rule, vacuum hoses are identified by color, especially for exhaust gas control system hoses. Different systems use hoses with the appropriate wall thickness, strength, and heat resistance. When replacing hoses, check that the parameters listed above are correct.
4. To check the condition of the hose, you often have to remove it from the car. When removing several hoses at once, mark their original positions to avoid confusion during subsequent reassembly.
5. When checking the tightness of hoses, do not ignore their tees. Make sure there are no signs of cracking of the connector, as well as that there is no deformation of the hose at the landing site, which leads to depressurization.
6. To determine the location of depressurization, you can use a small diameter hose (approximately 10 mm) as an auditory tube. Place one end of the hose against your ear and move the other along the hose and connectors being tested, trying to catch the hissing sound coming from the depressurization site.
Warning: When examining with an ear tube, be careful not to come into contact with moving mechanical parts such as drive belts, radiator fan, etc.
Fuel hoses
Warning: When performing routine inspection and maintenance of fuel system components, certain precautions must be observed. Work in well-ventilated areas, and do not allow open flames or light bulbs without a protective hood in the work area. Do not allow gasoline to come into contact with your skin. Wear rubber gloves. If gasoline gets on your skin, wash it off with running water and soap. Immediately wipe up any spilled fuel and store any material that has absorbed it in a place where there is no risk of fire. Before exposing elements, relieve pressure in the system (see chapter 4).
7. Check the rubber fuel system hoses for signs of wear and chafing. Pay special attention to hose bends and connections, such as the fuel filter connections.
8. When replacing, only high quality fuel lines should be installed. Under no circumstances should vacuum, clear, or coolant hoses be installed in place of fuel lines.
9. Spring clamps are usually used to connect fuel hoses. Such fasteners lose their elasticity over time or during the removal procedure. When replacing a hose, replace its spring clamps with worm clamps.
Metal tubes
10. The fuel tank is connected to the engine system by a metal fuel line, which runs along the body stiffeners on the bottom side. When inspecting, make sure there are no kinks or cracks in the fuel line.
11. When replacing metal fuel lines, use only seamless steel lines, as copper and aluminum lines are not resistant to normal engine vibration.
12. Inspect the metal brake system pipes where they connect to the master cylinder and brake control valve for cracks or loose connectors. A detected fluid leak indicates the need to inspect the entire brake system.