Charles,

Are you sure it's to coolant light? The only reason I ask is that the
coolant indicator doesn't have a buzzer (unless that's unique to '91) - the
oil pressure however has a buzzer - it usually comes on when you are over
2000rpm. I beleive that is the high oil pressure sensor that triggers the
buzzer - low pressure triggers the oil light. ( I beleive I have that
right).

If it is your coolant light and you are also getting the buzzer I suspect
you have more than one issue. I'll let those more experienced than I reply
to what that might be.

--
Thanks,

Jeff
'90 Carat (Grover)
'86 (We call this one Parts)
'78 Bus (Melissa) Patty's Bus