Gremlin82169

I have a 1997 legacy wagon with a 2.5 that overheats on the highway. When the temp gauge skyrockets, the heater quits putting out heat only cold air. This started when I changed the oil, air filter and put in a new set of E-3 plug and removed the Bosch +4's. It runs better than it ever has with the exception of its overheating issue. Can anyone HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:eek: