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XJ XJ8 / XJR ( X308 ) 1997 - 2003

Tricky overheating problem

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Old 12-04-2007, 07:08 PM
 
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Default RE: Tricky overheating problem

how about the wiring between temp sensor and ecm? the electrica water pump? normal resistance is 36 ohms.. right side of engine near belts.
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Old 12-12-2007, 07:08 PM
 
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Default RE: Tricky overheating problem

when water pumps go sometimes there blades brake off and im wondering if there clogging something...
and also the fans shud also always run at all timies.(low speed,especially with a/c on).. do they go high speed?
there maybe a problem either wiring or something with the fans. when on normal.. both fans are run in series so they are on low.. then when temp goes high.. the fans shud go high speed..which the relays makes the fans run in parellel for more amperage..more speed.. seems challenging wud love to work on it,
also if it is a "fake" over heating wiring to ect?
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Old 05-18-2008, 09:37 PM
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Default RE: Tricky overheating problem

Wow, im having some isues with my 98 xjr too. I hope its not as complicated as yours, i just bought the car a few days a go and ran fine untill earlier today i was driving a bit spirited but nothing crazy, and glanced at my temp gage and it was on Red w/the light on. I felt the hoses and i can notice a difference the higher radiator hose is really hot can only keep my hand on it for a few seconds and the other one one on the driver side is warm but can keep my hand on it. Im guessing its the thermostat. i checked the coolent when the car was on but not to hot and it didnt seem to be circulating, and i also had some not much of the coolent from the overflow spill out. The last owner said it had never done that before and hes had the car since new, i belive him. Would my driving a little hard be the cause for this or just bad luck?...Let me know when you figure out the problem.
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Old 03-04-2009, 12:41 AM
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the OP seemed to think the head gaskets were the problem, even after replacing them. Perhaps that should be your next venture?
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Old 03-05-2009, 02:25 AM
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i had the same issue on my 98 xjr, i was able to fix the problem by changing the water pump. my blades were all torn off but i have not had a problem with overheating since then. I also was wondering about the blades if they would cause damage if the were to brake off and go through out the cooling system. i hope you find the problem, good luck.
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Old 03-05-2009, 11:12 PM
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turn you ac on and both fans should come on low speed, make sure they BOTH come on. On thermostat issues, pop off the check ball when putting in a new thermostat. water pumps are NOT probelmatic anymore and putting a new style in twice IMO is guessing. surges of coolant and overheating is more an indication of improper air bleeding than a head gasket, and NO Jaguar engines are not complicated. It just does not pay to rebuild engines these days. machine work, acquirring parts,assembly, and warranty all contributes to having rebuilders that do engines all day do the work, its not that theyre difficult.. i have a bigger problem finding competant machine shops that doing a rebuild. And the ones that are good are buried with work and take too long
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Old 05-03-2009, 11:08 AM
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Quote:
Originally Posted by RossoCorsaItaly View Post
I burped the cooling system and the vehicle is no longer overheating at idle. I can let the vehicle sit for an hour and it will not overheat. As soon as I start driving it, it immediately overheats.

Any ideas?
Sounds like it needs a full on belch, not just a burp, keep bleeding.
________
FJ1200

Last edited by Sean B; 01-21-2011 at 07:12 AM.
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03, blown, circulating, forum, gasket, head, heats, jaguar, leaking, overheating, thermostat, type, water, xj8, xk8, xtype


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