Hello My LX 865 has a warning horn going off, when I start it the horn starts going off and the instrument cluster shows the engine temperature then another one will flash 255 degrees and the light on the bottom right center of the instrument panel flashes, nothing is hot because it will do the same when it is 10 degrees out after setting a week, everything seems to be working fine, I changed the temperature sending unit and it did not help anything. Does anyone have any suggestions? Thanks