It would help if you describe the "how and When" its overheating.
Is it climbing at idle, but OK at speed? Usually attributed to cooling fan, leak in system, bad water pump, Airlock in upper hose.
Is it OK at idle, and slower speeds, but climbs at speed? Usually indicates a clogged radiator, pressure leak, dirty or inefficient radiator.
Things to check IMO:
That knock - exhaust leak at the manifold could cause some issues and sound like a knock. does the knock go away after it heats up? or is it fairly constant?
That Electric fan - Does it have a shroud? Facing the right direction? How is it controlled? tested the temp sensor?
That T-stat - tried removing it and testing it in a pot of boiling water to ensure it's not faulty?
♔ 91 YJ "Alice" 4.0L, AX-15, NP 231 Flange, Adams Driveshafts F/R, 2.5" OME 36Rs, 5/8" /f12 Booms, 33" Yoko ATs, 4.10 D30/35 Aussie Lockers F/R
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