Chevrolet Repair: cooling fan malfunction, chris fan, couple degrees

Question
93 camaro 3.4L cooling fan not coming on at temp. climb. New (ECM) and (ECT). checked green wire from relay to (ECM)good.I can ground green wire and relay engages and fan runs.DO you have an idea on these systems that might help? Thanks for any help.

Answer
Hi Chris... fan should come on at any where from 90 to 105 C. if not comming on and relay is good check signal from coolent temp sensor, use an infared temp gauge to see if temp sensor is reading right...they should read within a couple degrees of each other. if not change the sensor...also check all your body grounds. engine to body. and body to battery....hope this helps