It may be a heat signal, though dont count on the water outlet to tell you pressure and flow. It is a tell tale, though other passages like a thermostat can still be plugged in the block. You could try to remove a thermostat and look for a blockage your self, though it would not be worth a power head to us. A 94 P2 has the digital dash, is the heat signal showing on the dash. Or it may have been disconnected by the new installing dealership. It will work fine in tandem with the other signals. BCB