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Manual instructions says to disconnect negative cable for safety, rock back and forth checking for freeplay or looseness - look for leaks from clutch fan. fan blades should turn freely by hand when cold. When the engine is warm the fan should have drag ,if it is warm and turns easily it needs...

My 94 4.0 had a rebuilt head that was repaired - welded . We ran a compression test and only one cylinder was some what low but with in spec. The bubbles in the radiator indicate a bad gasket or a cracked head. The crack is probably Very Small with only the high compression able to push air into...

my 1994 EXplorer 4.0 would burp into overflow and had to replace cracked head ! Try pulling plugs to find very clean plug that was washed with antifreeze. this also caused a miss. Compression forced air into water jacket. Ialso watched the overflow with engine running and saw air...