On the 123 there is no aspirator motor.

Pull the glove box and look to the left and forward of the glove box for a plastic pipe running horizontal. There should be a foam hose running across to the temp sensor that is under the little grill in the center top of the dash.

It is probably dissintegrated and gone. Go to Home Depot and get a stick of foam pipe insulation and cut a length to slip over these two connections. Don't use any other type of hose except foam due to the thermal properties of the foam.

Good luck,