WHILE WORKING ON A EUCLID PIT TRUCK, EMPLOYEE WAS TRYING TO DETERMINE WHETHER THE ENGINE THERMOSTAT WAS WORKING. HE HEATED UP THE SENSOR ON THE THERMOSTAT TO SEE IF IT WOULD CONTRACT THE SPRIN G AND OPEN. WHILE HEATING THE ELEMENT ERUPTED AND SPRAYED METAL FRAGMENTS IN THE FACE AREA. THE COMPOUND WITHIN THE ELEMENT STRUCK THE FACIAL AREA WITH FRAGMENTS INJURING THE RIGHT EYE.