Bad heater valve

[tdford5]

04 Explorer 4.0l Eddie Bauer
Driving last night coolant gushing out passenger side on the exhaust, i could not see exactly where it was coming from being smoke and night time started it this morning to move into the garage now is running real rough , is this due to the heater valve ? does it run off vacuum just looking for some ideas help ect
TIA

 

[swshawaii]

Engine overheated? Is the engine oil a milky color? Sweet smell from exhaust? Coolant reservoir low?

If so, not good, and likely a blown head gasket or cracked head. Crossing fingers for you, and good luck.