I have an '84 mustang with an '88 5.0 engine in it. There is a new fan, new radiator, new water pump, and new thermostat. The car starts strong and idols for 5-8 minutes with no problems. Both the output and return coolant tubes (to and from the radiator) stay cool to the touch. Then the return tube (Drivers side tube running to the bottom of the radiator) begins to get hot, and that side of the radiator begings to get hot, while the output side (passenger side) remains cool. 1 minute later, coolant starts spraying out of the overflow with a great amount of pressure, and both tubes instantly get boiling hot. Running the car with the cap off causes coolent to start overflowing out of the radiator fill port (where the cap would go) even during initial idol. Does anyone have an idea what my problems is? Is it the head gasket?

Thanks Allot

- Keith

 

Are you sure the radiator is new? or was it a "new" used one? it could be blocked maybe try to flush it and see what happens?

 

Check out the junkyard performance section for a remedy for it being blocked I just found out a remedy a couple days ago. [sm=smiley20.gif]

https://mustangforums.com/m_383314/mpage_3/key_/tm.htm

Plz don't post a reply in there though. The thread is for tips only.