87 gts OVERHEATING

[87CelicaGTS]

I JUST PUT IN A NEW RADIATOR TODAY. EVERYTHING IS HOOKED UP RIGHT. IT IS STILL OVERHEATING. AFTER IDRIVE THE CAR, WHEN I TUR IT OFF AND GET OUT I HEAR A HISSING NOISE LIKE A LINE IS LEAKING SOMEWHERE. I CANT SEEM TO FIND THIS LINE ANYWHERE UNDER THE HOOD. IT IS A LOUD HISSING NOISE. SO WHATEVER IS HISSING IS STILL CAUSING MY CAR TO OVERHEAT, BUT I DONT SEE ANY WATER ON THE GROUND. SO WHAT I THINK IS THAT WHATEVER IS HISSING IS LEAKING PRESSURE AND THERE ISNT ENOUGHT PRESSURE TO PUSH THE WATER THROUGH THE MOTOR AND THATS WHAT IS CAUSING MY CAR TO OVERHEAT. HAS ANYONE HAD A PROBLEM LIKE THIS AND DOES ANYONE KNOW WHERE IT COULD BE LEAKING PRESSURE FROM?

[Pineapple]

Next time keep engine running, open the hood to see if there is any smoke or coolant leak. Check the top hose to make sure you got pressure, hose will be hard if pressurized. Usually you leak on the hose. The most effective but stupid way is to change all the coolant hose. If non of them had been change since 87, you better do them all.