My 92 sc3 has been runing like a champ sens I got it till just the other day the heater realy isint blowing hoy air anymore and the cars heat gage reads a full bar more than befor also the overflow tank for the radiater always seams to fill now when I turn it off and start to poor out and sujestions on what to look at or what it is????

just took the intake piping off and found that somweeere under the exhost manifold or lower theres a big leak of oil and coolint i think the block is cracked?

Hopefully it's something less drastic, like a cracked head gasket. The heater not working, higher temperature reading, oil leak and full overflow tank are all symptoms of a head gasket.