Join Date: Oct 2002
Location: San Marcos,Ca
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OK, the rad is new, so as long as it has never had any sealer or stopleak in the system it should be clean. Next is the Shroud. If you do not use the shroud it will run hotter at lower speeds. At freeway speeds you are pushing a lot of air through the radiator rather than pulling it with a fan.
I had a high heat problem a few months ago and found a heater hose that was leaking a small amount, not enough to see on the ground but the heater valve was wet. It would not leak much but when cooling down would suck a LOT of air into the head/intake so that when I started up the next time there was a big air pocket below the thermostat and it would go to hot in 4 blocks. but then it would go down very quickly and run OK. I replaced the hose on the heater valve and is OK for now. Running arround town today at 106* temp guage is 1/16" above the middle mark and right on the middle on the highway.
Is your radiator completely full first thing in the morning? That is, does it suck the coolant from the overflow after shutting down? If not, you have a leak in the system; cap, hose,or a pinhole somewhere, and you will overheat under the right conditions. Keep trying.
"Batteries not included, Your mileage will vary"