Your temperature gage wont heat up is this the thermostat 93 grand am se?

even if the thermostat is stuck open the vehicle will warm up to operating temp eventualy. the gauge should move. if the gauge don't move at all the problem may be the gauge itself or the sending unit. to test your system perform the following test. ground the wire to the temperature sending unit. this should cause the gauge to read hot(if is a light it'll glow) if NOT, the circuit before the sending unit is faulty. if the gauge functions the sending unit may be bad.(in order to see result,after grounding turn on the ignition switch.) if you need to find the location for the sending unit try going to www.autozone.com and enter your vehicles info. go to vehicle specs./components location