Only a dealer service department or air conditioning shop with the proper equipment and personnel can safely depressurize system, the air conditioning hoses replacement. Under excessive heat in the engine compartment, many rubber and plastic hoses for the operation of the engine, accessory, and emission systems deteriorate. Hoses are fitted with clamps to hold them securely. In order to prevent leaks, ensure that the clamps are tightened adequately. If there are no clamps, see whether the hose is extended or hardened at the fitting. Hoses in the emissions system may be color-coded (eg striped blue) and, while different systems require hoses with different wall thicknesses, collapse resistance and temperature resistance may also be important. Make sure the hoses are of the same material as the one you are replacing. In many cases, it repairs the hose completely. Make sure you label it for later installation. Check the plastic T-fittings for any cracks or distortion that may lead to leakage. You can listen for any hissing sounds to detect leaks with the help of a short piece of vacuum hose. It is advisable to inspect all rubber fuel lines for deterioration and chafing at bends and at fittings. The replacement fuel line must be of the highest quality (identified by the word Fluro elastomer). When you change a fuel line hose, always replace the spring-type clamp with a screw-type clamp. Spring clamps lose tension over time. The sections of metal line that run between the fuel pump and the carburetor or fuel injection unit must be examined for bends, crimps, and cracks. If the fuel line is made of metal, it should be replaced with seamless steel tubing because copper and aluminum are not strong enough for engine vibration. Furthermore, examine the metal brake lines at the master cylinder and brake proportioning unit for cracks and loose fittings. Similarly, any signs of brake fluid leaking requires a complete inspection of the braking system.