i just completed a 3.8 to 5.0 swap in my sn95 and i was driving down the street and i turned on my heater blower and POOF... coolant vapors filled the car and the engine freaked out... and blew off the upper radiator hose, dumping coolant all over my nice new clean shinny 5.0. now... i checked the thermostat... its fine. i know for a fact that it wasnt full with coolant. so im assuming the air pockets heated up and expanded... thus causing the hose blow off. but... would that kill my heater core? now when i try to burp the radiator to fill it, the coolant surges out the cap openning... then drops about 4 inches. then 3 seconds later it surges back up and spills out coolant, then drops again. any thoughts?

 

r u running the correct rotation waterpump?did u blow a head gasket? are the hose clamps to the core tight?go to auto zone and get the loan a tool coolant pressurizer to look for problems if ur core is bad have fun i just did mine on my 91 gtvert whole dash had 2 b taken apart dont know about sn95 tho

 

JUST did head gaskets last night. before problem came up. it is the correct rotation. it ran fine before i did the head gaskets. and yes i did put them on the right way... if your going to ask. and the clamps ARE tight. no doubt.

 

is the stat upside down?..never know..try running water threw the block remover the stat and lower rad hose from the rad..flush it

 

well the problem wasnt fixed... but i drove it anyways... here is the outcome...

My mustang...

 

Sounds great man. Nice way to break that 5.0 in.