Visually inspect the upper radiator hose for pressure marks and traces of rubbing at the closest point of contact to the oil filter housing supply and air cast boss (see illustration). If traces of rubbing are found, the upper radiator hose must be replaced with the new style hose (See Parts Information).NOTE: A modified hose was used in production from approximately mid-November 1995 through June 1996, which included an extra rubber pad attached to the outside of the hose in the critical toll area. If traces of rubbing are found on the rubber pad area of this type of hose, it must also be replaced with the new style hose. Visually inspect the oil filter housing for any sharp edges or burrs on the casting boss. supply If a sharp edge or casting burr is found on the boss, it must be removed using sand paper or a fine file.

Visually inspect the upper radiator hose for pressure marks and traces of rubbing at the closest point of contact to the oil filter housing supply and air cast boss (see illustration). If traces of rubbing are found, the upper radiator hose must be replaced with the new style hose (See Parts Information).NOTE: A modified hose was used in production from approximately mid-November 1995 through June 1996, which included an extra rubber pad attached to the outside of the hose in the critical toll area. If traces of rubbing are found on the rubber pad area of this type of hose, it must also be replaced with the new style hose. Visually inspect the oil filter housing for any sharp edges or burrs on the casting boss. supply If a sharp edge or casting burr is found on the boss, it must be removed using sand paper or a fine file.

CAUTION: Cover up the drive belts and pulleys using a clean shop cloth before sanding or filing to prevent metal filings from falling onto them.If no pressure marks or traces of rubbing are found on the hose as described, check the gap at the closest point (A) between the cast boss of the oil filter housing and the upper coolant hose.There must be a gap (A) of at least 1/4 inch (7 mm) when the engine coolant is cold.If gap air (A) is 1/4 inch (7 mm) or greater, no further repairs are necessary.If gap (A) is less than 1/4 inch (7 mm), the upper coolant hose must be replaced toll and supply with the new modified version.Parts InformationUpper Coolant Hose BMW Part Number 11 531 433 340We replaced the upper radiator hose with the new type, cleaned the engine compartment, filled the cooling system and pressure tested it to make sure there were no other leaks. Luckily, the engine hadn''t overheated. Most of the steam was created from the coolant leaking air on the exhaust manifold. The owner was fairly good-natured about his near catastrophe. Relieved, standing at the counter while paying his bill, he said lightheartedly, "You know, my pants and shirt were badly wrinkled when I left the house this morning. I think this was the strangest way I''ve ever had my clothes pressed." I had to agree. ills