1. Under the Hood
Under-hood heat speeds the aging process, so watch out for weak links in the engine compartment. Check fuel lines, radiator and vacuum hoses, spark-plug wire insulation and anything else made from rubber for cracks, discoloration or other signs of aging. Hoses under pressure-like those to and from the radiator-bulge when they deteriorate. If you don't see obvious bulging, push the hose with your finger to test for soft spots.