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Message: <blockquote data-quote="Richard Drye" data-source="post: 996089" data-attributes="member: 70661"><p>The thermostat housing leak can be very hard to diagnose.  The most important clue is the leak next to the oil pan.  Let it get hot and look to see if coolant is running down the front of the block.  When the housing went in the Mustang it was easy to spot.  There is more open space to see in the car than my ST.  Also how many miles are on the Sport?  According to most folks on All Ford Mustangs most leaks occur at 70 to 80 thousand miles, our went to 120K before letting go.  Good luck, follow the link mentioned above and enjoy the bonding time and accomplishment.</p></blockquote><p></p>