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Message: <blockquote data-quote="Blind" data-source="post: 464749" data-attributes="member: 10282">it shouldn't, I have a fluidyne in my `89 and it sits at thermostat temp unless I'm really hammering the car, then it goes +5* over thermostat temp.my `97 sits at thermostat temp also, but the mark8 fan runs a lot more than it does in my `89, and I have them set on the same temperature on/off settings and same temp thermostat's.the thermostat is what maintains temperature, really. So long as your cooling system is in good condition, changing the radiator will do nothing. If your radiator is plugged or your coolant is very old, replacing the radiator and flushing/bleeding the system will of course make a huge difference, especially in hot weather area's.The only real noticeable difference is the heater takes FOREVER to warm up in my `89, and the car isn't up to thermostat temp for about 15 minutes, so it takes a lot of self control not to hammer on it on a cool winter night...</blockquote>