i just got a 94 ls last night, and i as i was driving it home i realized the temperature guage had quit working. i pulled over to make sure everything was still going ok under the hood. everyhting seemed fine so i kept driving home. Any idea on how to fix this?? like temp senser or maybe faulty gauge??

 

does the heat in the car work? if not, could be that your thermostat is stuck.

otherwise, i'd check the wire to the sensor on the block. some rodent ate right through mine once, so i had to solder the wire back together.

not sure what else it could be.. perhaps a fuse. i'll have to check my books when i'm home.

 

taken from 98 helms

gauge test:
1. check the no. 25 (7.5A) fuse in the under-dash fuse/relay box before testing.
2. make sure the ignition switch is OFF, then disconnect the YEL/GRN wire from the ECT gauge sending unit and ground it with a jumper wire.
3. turn the ignition switch ON. check that the pointer of the ECT gauge starts moving toward the H mark.
CAUTION: turn the ignition switch OFF before the pointer reaches the H on the gauge dial. failure to do so may damage the gauge.
*if the pointer of the gauge does not move at all, check for an open in the YEL or YEL/GRN wire. if the wires are OK, replace the ECT gauge.
*if the ECT gauge works, test the ECT sending unit.

ECT sending unit test:
1. disconnect the YEL/GRN wire from the ECT sending unit.
2. with the engine cold, use an ohmeter to measure resistance between the positive terminal and the engine (ground).
3. check the temperature of the coolant.
4. run the engine and measure change in resistance with the engine at operating temperature (the radiator fan comes on).
*if temp = 133, then resistance =137
*if temp = 185-212, then resistance = 46-30
5. if the obtained readings are substantially different from the specifications above, replace the ECT sending unit.

 

thanks, im gonna get started on that in about an hour.

 

and yes the heat works fine