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Message: <blockquote data-quote="XxslowpokexX" data-source="post: 1023449" data-attributes="member: 16966">Sometimes Overheating engines intrigue me and I just cant figure out what it is.I have a 1995 auto GT which I plan on doing a bunch of mods on..However I want to fix a few issues it has first.First issue is that it runs hot on the highway.  Driving around town idling..No issues.  Stuck in traffic in 100 degree weather...fineDo 80 on the highway and eventually it will creep on the high side of the factory Temp gauge. An dit is running hot as I will overflow my tank when I plul over and shut down when running that hot NOWWWWWWWWWWWWThat generally seems to be a radiator issue.  Well Rad and fan were new when I bought the car..However I put a nice big aluminum rad and a 180 thermostat anyways.Same issue.   No oil in water water in oil..  Also cleaned condensor to make sure it wasnt clogged or blocking airflow .  And the fan seems to work..But shouldnt be an issue at 80mph anywayAnother issue is detonation...And yes I read plenty on that.  Timing set at 10 degrees..May be an EGR issue..May be corelated to this issue. Havnet gotten aroudn to that as I dont beat on the car and its fine if I dont do thatFuel pressure seems fine but pump will be changed soon when I do mods.ANy ideas...Something I missed???</blockquote>