Originally Posted by 88bonnsse
thanks i will be searching it up now.. let you no if i find it or not..
Wow, this has turned into a horribly complicated problem regarding the coolant level sensor. I thought it was just an idiot light on the RPO U50 panel.
I went digging through the 90 Bonneville service manual and finally found a page regarding this sensor. It'* not a simple ON/OFF switch. It'* only on an SSE with a DIC module in the dash. The actual probe in the radiator is a resistor that changes from over 50Kohm when the probe is dry, to under 10Kohm when it is wet with coolant. In order to make this work, you would also need the low coolant module the probe was connected to, which in turn can operate a lamp (or feed a signal to the DIC module to display it the way GM designed it.)
Pipe plug is sounding better all the time