Replace the fan speed resistor in the fan Housing
It is because this has gone bad and the connector is melted... not hard repair. Sometimes the connector does not melt completely if you catch it in time.The climate control fan on my 94 9000 CSE wont shut off, in fact it only runs on high! Any ideas why and how to fix it? I was thinking of running a toggle switch to it under the dash for an on/ off operation.