You will need to have the system pressure tested, this will locate any small leaks, ensure that it is done with the heater on to check the heater core as well.
mark (mhpautos)
Nov 22, 2010 at 5:11 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.