1989 BMW 325I

PROBLEM WITH COOLING SYSTEM BEGAN WITHIN APPROXIMATELY ONE MONTH OF PURCHASE DATE (. CAR BOUGHT USED, FROM MECHANIC/BMW AUTHORIZED REPAIR SERVICE (SAME MECHANIC IN FOLLOWING NARRATIVE). NOTICED 1): COOLANT LIGHT COMING ON; COOLANT LEVEL SLIGHTLY LOW; TOLD PROBLEM WAS DEFECTIVE COMPUTER CHIP, TOLD TO KEEP EYE ON COOLANT LEVEL; BROUGHT CAR IN AGAIN BECAUSE LIGHT COMING ON MORE OFTEN, COOLANT LEVEL LOW TO EMPTY IN OVERFLOW AFTER MEDIUM-LONG DISTANCE DRIVE (75 - 100 MILES); TOLD TO JUST KEEP PUTTING COOLANT IN OVERFLOW, NOTHING WAS WRONG; ASKED MECHANIC TO CHECK THE COOLANT SYSTEM EVERY TIME WE BROUGHT CAR IN FOR REGULAR MAINTENANCE; SAME PROBLEM CONTINUES, BUT TRAVEL DISTANCE IS LESS (50-75 MILES), BROUGHT IN AGAIN, TOLD RADIATOR LEAKING; MECHANIC PUT STOP-LEAK IN IT; SAME PROBLEM, EVEN LESS TRAVEL DISTANCE (30 MILES); REPLACED RADIATOR; SAME PROBLEM CONTINUED,(AFTER DRIVING 25-35 MILES), TOLD TO KEEP EYE ON COOLANT LEVEL; TRAVEL DISTANCE 13 MILES, LIGHT GOES ON, ENGINE MAKES LOUD NOISE; TOOK CAR IN, TOLD COOLANT GOT INTO ENGINE AND HEAD OR ENGINE BLOCK PROBABLY CRACKED AS A RESULT OF OVER-HEATING, EVEN THOUGH TEMP GAUGE NEVER INDICATED ANY OVERHEATING; TOLD FOR FIRST TIME THAT TEMP GAUGE DOES NOT REGISTER AFTER COOLANT FALLS BELOW A CERTAIN LEVEL: TOLD THIS WAS A BMW PROBLEM BECAUSE OF WHERE THE SENSOR IS LOCATED; TOLD PROBLEM COULD BE SOLVED WITH A "STOP-LEAK" TYPE OF PRODUCT FOR THE ENGINE; SAME PROBLEM OCCURRED AGAIN:LIGHT ON, COOLANT LEVEL 0; FINALLY JUST TOLD 8-22-05 THE HEAD IS CRACKED. 2):FRONT WINDOW WOUOLD NOT DEFROST, EVEN WHEN WE WIPED IT OFF. 3): SMELL OF GASOLINE: TOLD THERE WAS NO PROBLEM. WE HAVE HAD THIS CAR IN THE SHOP FOR THE COOLANT PROBLEM THIS LAST TIME FOR OVER 3 WEEKS. WE HAVE SPENT A FEW THOUSAND DOLLARS PRIOR TO THIS LATEST DIAGNOSIS, NOW MECHANIC SAYS IT WILL COST US AT MINIMUM 1400 FOR A USED HEAD. DEFROST PROBLEM NOT SOLVED; GASOLINE SMELL STILL THERE.