I've been having fits trying to get this thing to stop overheating. I can drive around town up to ~40 mph all day long in temps up to ~90 (so far) and the needle hovers just left of the center line (I think it's either an '85 or '79 dash, not sure). No issues.
Hit the highway at ~65 mph and temp starts climbing, once it gets much past the middle of the temp range it doesn't come back down. I can get off the highway and try to cruise town for a bit 30-40 mph since it runs fine at those speeds but it still just keeps heating up until it just overheats (needle in the red, knocking under load, boiling into the overflow jug, all hoses, radiator blistering hot). RPMs are about ~2800 at 65 mph (as fas as I'm comfortable taking it for lots of reasons).
360, stock motor, stock water pump (that is a little loose and will soon get replaced), new 180 t-stat, aftermarket four core radiator, all new hoses, tried replacing fan clutch to Hayden thermal (which does not seem to tighten up much even at overheat; same as old stock I pulled off it), stock 7-blade fan, fresh Prestone mixed 70/30. Radiator is clean inside and out (no bugs, clogging). I don't understand, I would have thought at speed it would get plenty of air through it; people generally tend to overheat putting around town in hot traffic. I don't get it. On the highway once it starts getting hot it just keeps going until I bring it home and park it. Putting around town it's fine all day long.
Hit the highway at ~65 mph and temp starts climbing, once it gets much past the middle of the temp range it doesn't come back down. I can get off the highway and try to cruise town for a bit 30-40 mph since it runs fine at those speeds but it still just keeps heating up until it just overheats (needle in the red, knocking under load, boiling into the overflow jug, all hoses, radiator blistering hot). RPMs are about ~2800 at 65 mph (as fas as I'm comfortable taking it for lots of reasons).
360, stock motor, stock water pump (that is a little loose and will soon get replaced), new 180 t-stat, aftermarket four core radiator, all new hoses, tried replacing fan clutch to Hayden thermal (which does not seem to tighten up much even at overheat; same as old stock I pulled off it), stock 7-blade fan, fresh Prestone mixed 70/30. Radiator is clean inside and out (no bugs, clogging). I don't understand, I would have thought at speed it would get plenty of air through it; people generally tend to overheat putting around town in hot traffic. I don't get it. On the highway once it starts getting hot it just keeps going until I bring it home and park it. Putting around town it's fine all day long.
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