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My question is, is this a new thing not related to your mods ie how long have the mods been in place without the heating issue?
I'm not aware of any huge differences in coolants having more or less cooling properties. Plus, your coolant isn't very old so I wouldn't go there. Hell my '94 has the factory coolant in it and there have been no problems!
Also re: "old" battery: that same '94 has the factory battery! 15 years by my math...
I'd do the easy thing first and open up a bit of air flow. I'd also make sure the rad and xchanger fins aren't all bent over or plugged up.
If that doesn't do it, I'd test the tstat. They do go bad from time to time.
This is a long shot, but I have heard of overheating issues being caused by radiator hoses collapsing under flow- the "suction" hose needs to have a reinforcing spring in it to prevent that. Has that ever been replaced? ('94 has factory hoses too!)
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