i ran into this problem tonight...i was driving down the road and i came to stop and the car started spitting antifreeze....it was steaming out from under the hood, while it was steaming and dropping fluid onto the ground it was making a hissing noise....i made it to a place to let it cool down and add water.....after adding water i headed home..it didnt start steaming and hissing on the way home after i had added water...is there a pressure relif valve that may have just opened do to low collant levels?

 

just change the thermostat if you havent already.

 

i plan on doing so but i dont think thats the only problem as both the upper and lower rad hose were hot and the temp gauge was still working normal

 

are there any sensors by the thermo?

 

fan switch.....thats about all i can think of off the top of my head

 

do you know exactly where is was leaking?

 

that i dont...it was dark all i hear was a loud hissing sound and alot of steam....not exactly sure where it was leaking...im thinkin the radiator because of the hissing

 

yeah let it blow off its load in the morning. its easier to find out the problem if you know where its leaking, or at least i think it will help others help you.

 

fixed...the heater core hose going to the side of the engine went bad...thanks for helping dleccord