overheating

[Maengelito]

Not sure about Subiess but sometimes not having a tstat in will cause cavitation around the water pump impellers which essentially will stop the flow of coolant and just swish the water around the impellers. Again, not sure if this is the case about Subies but if you're worried, you can always take your old thermostat, drill out the thermostat part so its just the ring sitting inside the housing and that should help.