Thanks for the response. Yes it's the fan switch. Carb swap, no ecm, EWP, etc. I know it's nonsense but I don't like reusing coolant. Guess I'll just bite the bullet lol. Thanks againFan switch? Or ECT sensor? I have a 93 with the 1 year only ECM and even it has fan settings in the tune. Only thing in my pump is an ECT sensor. To your question though, I'd venture a guess at no more than a gallon. Block holds about 2 gallons and a stock radiator about 1. If your coolant is fresh, drain it in a clean bucket and dump it right back in when you're done.
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