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If you haven’t replaced many of the plastic parts in your cooling system that fail, which Scottman has already done, this link will help you understand what may be the cause 01 LS Coolant Parts Replacement advice please!!

I had that issue even after replacing my actuator too, but eventually it kicked in, maybe after a few weeks. In that time I replaced the belt and the old fluid in the reservoir, sucking out then refilling and verifying the filter was clear of debris. I don’t remember doing much else.

After replacing all cooling parts including radiator and still having leaks under the aluminum fill cap I over tightened and went about my business. After getting an overheat two years later and seeing the coolant residue and lowered level, I resolved to cut an o-ring (Dorman assortment) to fit...