1994 Camaro Z28 convertible Automatic. First my add coolant light stays on, even after I check and add coolant to the proper level. What would cause it to do this. Second my ABS INOP light stays on. I haved changed the relay for the ABS system but nothing changed. It dose not come on untill about 30 secs of driving. What could be the cause of this. Thanks for your help.

abs= wheel speed sensor
low coolent= coolent level sensor

What he said.