The temp indicator in the I/P suddenly quits working, going from normal to zero, then immediately the display on my IP reads " engine too hot, A/C off". This happens even in the morning, when the engine has been off for about 10 hours, so that can't be right. I drive for a couple of miles and the thermostat comes back to life and there is no problem. I had the dealer changing a solenoid and the problem went away for a couple of weeks, yet now is back. Any suggestions?