My car, 92 RS 305 TBI, is overheating even on short trips. There's no white smoke indicating intake leak. I have a dual core radiator, a fan with double the cfm capacity as stock, and a high flow water pump. The water pump works fine, the thermostat works as well. The fan comes on when it's supposed to so that tells me that the cooling fan switch is functioning as well. The air dam is in place and fairly new.
Any suggestions on where to start/what to check for or replace?

Thanks

 

Try the head gaskets? You might have a cracked one.

 

Pressure test the cooling system sounds a lot like a head gasket to me too.