Unless there is a difference in the coolant system from the SSEi to the Series II normally aspirated, there are several other things to check. Besides that bypass fitting, there are the heater hoses and their fittings (sealed with 0-rings) into the idler assembly on that side. And there is an o-ring that seals the passage from the water pump to the idler assembly. And as 1993 SLE suggested, the water pump. You might try using a mechanic'* mirror and watching the area directly under the water pump with the engine running. (Be careful not to get caught in the belt!) When the water pump bearing wears, the shaft seal is the next thing to go, and the coolant drips out a hole underneath where the shaft goes into the pump. Try this: with the engine off, grab hold of the water pump pulley and try to rock it back and forth. It should not wiggle. If it does move any way but round and round, that is probably your problem. Or soon will be.