Q&A

i JUST BOUGHT IT WITH 135K MI. I DROVE IT 400 MI. AND ENGINE HAS A TAPPING NOISE AND THE TEMP GUAGE NEVER WENT ABOVE HALFWAY AND THEN DROPPED SLOWLY ALL THE WAY TO BACK TO THE C WHILE DRIVING GOING 60 MPH IN 20 DEGREE OUTSIDE WEATHER AND HEATER BLEW LUKE WARM AIR AFTER IT DROPPED DOWN TO THE C? OIL LEVEL AND COLOR IS FINE AND COOLANT OVERFLOW TANK IS ABOVE THE MIN MARK AND RADIATOR IS SHOWING FULL WITH NO BAD DISCOLORED REDIDUE(CHECKED WHEN COLD AFTER THE TRIP). NO MUD ON RADIATOR CAP. WHEN I WAS INITIATALLY CHECKING VEHICHLE TO BUY I DID NOTICE SOME WHITE FILM ON INSIDE OF ENGINE OIL FILLER CAP. SALESMAN SAID ALL OF THOSE 3.0'S HAVE THAT AND THAT ITS JUST TRAPPED MOISTURE WHICH I SAID THAT LOOKS LIKE THERE IS A COOLING SYSTEM PROBLEM OR BAD HEAD GASKET. I ALSO NOTICED A COOLANT SMELL INSIDE THE VEHICHLE AND DID SEE A STAIN ON PASSENGER SIDE CARPET (DRY THO).