I have a 1997 XJ6 that had the problem with the cooling fans running constantly. I had to remove the fuse to turn it off to keep the battery from running down. It turned out my solution was that an A/C sensor on the firewall (there are two) was bad. When I replaced it the problem went away.
SOURCE: 1998 jaguar xj8 overheating.
The early XJ8s were designed to operate as you describe, only kicking the fans in with the AC which is fine when the cars warming up (in fact it helps the car warm up faster & use less fuel), however, Jaguar realised in some climates this was causing overheating, later ones (99my on) operate constantly with the ignition on at slow speed & speed up if it detects it needs to.
This is a complex 2 relay system with alot of wiring that goes into the ECU & cant easily be retrofitted to your one.
I`d advise you to take the car to a good auto electrician & ask him to fit a manual switch on the dash with a relay to the fans so you can turn it on manually when its warmed up (if he can fit a slow speed relay with a resistor as well as a full power one, all the better, as you dont want to over cool either).
I`d also advise you to get the thermostat changed every year & the water pump to be upgraded to the current spec one, as these are both known issues that occur & also cause overheating.
Best of luck!
SOURCE: 1998 xj8 jaguar
have someone pull the release while you lift upon the side that wont open. you should be able to get it to unlatch that way
SOURCE: 1998 jaguar xj8 timing chain
http://jeg.serverhouse.com/Jag_docs/Timingchain.pdf
Here it will show how to do the job step by step.
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SOURCE: diagram for a 1998 jaguar xj8 serpentine belt
My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.
I do not know if you still need this information, but I am going ahead and answering it anyway. You may want to Print the Diagrams for future use.
CLICK on the following LINK. It has the Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!
Again my apologies...
Thanks!
http://www.2carpros.com/car_repair_information/year/1998/make/jaguar/model/xj8/1998_jaguar_xj8_drive_belt_routing_diagram.htm
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