XJ XJ8 / XJR ( X308 ) 1997 - 2003

Coolant Hose Malfunction

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Old Dec 21, 2013 | 07:15 AM
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Default Coolant Hose Malfunction

Just last night I drove about a mile and my engine coolant warning came on. I pulled over and saw an enormous leak coming from the passengers side, I figured it was a hose, as I opened the trunk I noticed the hose had came off from it's attachment on the engine.
I tried to search for a clamp on the ground but to no avail, I reattached/slid the hose back on, filled the coolant while checking to see if anymore leaks occurred. They did not so I drove it straight home.


My question is... Does that hose have a clamp or securing system that I am not aware of? Do I need to buy a new one?


In fear of it coming off again I am waiting to find out the best way to go about it.


Thanx.


2000 XJ8 / 80k miles
 
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Old Dec 21, 2013 | 08:29 AM
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All the hoses have clamps. Besides replacing the clamp, it would be wise to have the cooling system checked out. If the clamp popped off, there may be excessive pressure in the system due to running too hot, even if the temperature gauge is not registering overheating yet.

If you have a OBDII scanner, you can monitor the temperature. In general, you should not see the car ever running over 215F, and it should average close to 200F.
 
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Old Dec 21, 2013 | 11:16 AM
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All of the hoses have those rubbish spring type clips, in my experience I have come across some that have corroded to the point of breaking in half, which may of happened to you, obviously the clip disappears under the car whilst driving, replace it with a standard jubilee or worm screw type and you will be fine
 
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Old Dec 21, 2013 | 11:25 AM
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Upon further research and perseverance I was able to find the actual hose piece still intact after it popped off the metal pipe. It is a NORMA connector, It seems to be unbroken and maybe popped off from engine pressure as White XKR had mentioned before.
Now I am wondering if there is a way to screw/clamp this back on and see if it works?
 
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Old Dec 24, 2013 | 08:35 PM
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yes today I replaced lower radiator to engine hose on my xk8 98`had a hard time putting on the clamp `finally had replaced them with worm type clamps` and yes its very important to clamp the hoses `u are lucky still but without clamp the hose will eventually pop out and instantly drain the anti freeze maybe in the worst situations
 
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Old Dec 24, 2013 | 08:37 PM
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any idea where the ignition module on an xj8l 98 is located/?
 
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Old Dec 25, 2013 | 12:54 PM
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Originally Posted by XKRacer
All of the hoses have those rubbish spring type clips, in my experience I have come across some that have corroded to the point of breaking in half, which may of happened to you, obviously the clip disappears under the car whilst driving, replace it with a standard jubilee or worm screw type and you will be fine


We can all have our opinion but sometimes facts are better than opinion.
Those "spring type clips" that you are talking about are in fact constant pressure clamps and are much better than regular worm/Jubilee clamps.
Why:
As their name imply they apply a constant pressure on the hose, regardless of the slight expansion and contraction of the hose due that the different temperature and coolant pressure.
A regular worm clamps cannot do that and therefore have a tendency to get loose for a few heat cycles until the hose is completely compressed under the clamps.
Obviously if a regular clamp exert the right pressure on a hose when cold, the pressure will be too high when hot and vice versa.
If your clamps are rusting, you must have some serious other issues on the car.
Constant pressure clamps only fail when removed with the wrong tool (pliers) and when extended past their design limit.
 
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Old Dec 25, 2013 | 05:54 PM
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I will not deny anything you say, however I see many XKs, considering I deal with and have done for 10 years with nothing other than XKs (apart from the odd Aston Martin) I like to think I see more than your average owner or even Independent dealing in all Jaguars other than a specific model like myself......

They are rubbish..... In design when new, work well do there job and cheap to make, but show me one that has taken on a dozen plus UK winters and the car has not been looked after as it should, then it's a different story.

I know this is an XJ forum but as far as the engine is concerned the same applies
 

Last edited by XKRacer; Dec 25, 2013 at 05:56 PM.
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Old Dec 26, 2013 | 01:38 PM
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Thank you guys for your insight, just yesterday I had a notion. Could the thermostat become inop and thus caused the coolant hose to pop off the way it did?
Just trying to prevent this from happening again, i know I will have to replace the hoses and clamps but I don't want to do it twice.

Thanks Again.
 
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Old Dec 26, 2013 | 02:05 PM
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There have been many reports of thermostats stuck closed on these engines. Replacing it is not expensive IF the plastic housing doesn't crack in the process. Don't overtighten. better yet, replace it with an aluminum one.
 
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Old Dec 26, 2013 | 02:57 PM
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ant idea where the ignition module of 98 xj8l located `? is it in the ecm ?
 
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Old Dec 26, 2013 | 03:06 PM
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It is likely to be the same as the XK8, two modules at the back of the engine on the firewall. Just trace the ignition wires where they leave the valve covers and you are bound to find them.
 
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Old Dec 26, 2013 | 05:31 PM
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thanks for ignition location rj237` too cold outside in driveway in ny now to check now. will try first thing tomorrow .thanks again
 
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Old Dec 26, 2013 | 08:58 PM
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If you read the electrical guide you will see COMPONENT LOCATION in the engine management section 4.4

Ignition Module 1-2, Engine Compartment, Control Module Enclosure.

bob gauff
 
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