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Engine info is very helpful on these sorta questions...

An 84 will have either the GM V-6 (2.8L) or the 4 cylinder. RARE XJ's may have the early diesels... not many of those around but there were a few made. Inline 6 cylinder / 4.0L XJ's came in late 80's with the RENIX managed engines and CLOSED cooling systems (pressure bottle on firewall + NO RADIATOR CAP). HO engined XJ's with OPEN cooling systems began in 1991 and have a standard radiator cap.

Your XJ, if it has the GM V-6 definitely has an open cooling system (standard radiator with cap) and should have same with 4 cylinder. I know of no closed cooling system XJ's prior to the RENIX 4.0L's but...

Is the clutch fan working corrrectly? Is the radiator clogged up with debris? (After all... this is a 20+ year old vehicle.) Are your hoses in good shape & NOT collapsing under high engine RPM's? Good thermostat? 50/50 antifreeze mix?

Did someone put the incorrect GM water pump in? Late model GM v-6's (fuel injected) came with serpentine belts that had REVERSE rotation from the original 2.8L's.

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