Assuming you're talking about the engine temp. sensor (and not the ambient temp. or intake temp. sensor):
Temp. gage reads other than what you know the engine temperature to be. Also, since the fans work off that same sensor, you may get overheating (due to the fans not working) - but your gage won't be indicating overheating even though the engine is actually overheating since the same sensor output is used to drive the gage and the fans. That's if the sensor output says it's cold when the engine is actually hot. If the opposite is true, then gage would read high when the engine is not hot, and the fans would run a lot or all the time.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs
Last edited by peva; 09-23-2011 at 06:07 PM.