Question about Jaguar XJ8

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This week, I purchased my dream car, a 2003 XJ8, 8 Cylinders, 4.0L engine, it has 51,000 miles on it. My problem is the Low Coolent Light comes on after driving for 10-20 minutes and stays on. The coolent level has been checked, twice, they can't get the system to show what the issue is with the light coming on. Also, I'm told the 5-7 minutes of ticking sound is normal when cooling down, is this correct? Can you help me? I'm "freaking out" as this is my luxury car, purchasing it was beyond my widest dreams and I love it! Regards, Gail

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  • gpclt Jan 23, 2009

    I appreciate MrScary66613's advice and I will follow up on his recommendations. I would appreciate any other input as I'd like to have all the information and suggestions to present to the mechanic. Being a woman, some mechanics still tend to disregard my concerns or suggestions from experts.
    Regards,
    Gail

  • gpclt Jan 23, 2009

    No leaking of antifreeze. The antifreeze has been topped off, small amout, twice. The engine indicator steeps to midline within 15 minutes of driving the car,it doen's go over the midline, though the low coolent light stays on.

  • gpclt Jan 24, 2009

    Thank you to MrScary66613, bunnydawg and MrMark52! I humblely appreciate your input as to my Jag's problem.
    Thanks again guys!
    Gail

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Low coolant light is most likely caused by the sensor in the coolant jug. If you were having an actual coolant problem you would have an overheating issue.

Posted on Jan 23, 2009

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I have an 05 dodge grand caravan and have had some dash problems with lites going off or staying on .the dealer could never find the problem.....of coarse! i like what bunny says, if its not heating up could just be a short or sensor malfunction.can you find who owned it previously and say''hay i bought this great car you had and im wondering if you had any trouble with the water temp lite''.they may be glad to give you so history on the car. God bless ,tom

Posted on Jan 23, 2009

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Hi and welcome to FixYa,

Congratulations on getting your dream car.

To your concerns:

  • 5-7 minutes of ticking sound - as MrScary66613 posted, it is normal. This would be the metals creaking when cooling down;
  • Low Coolant Light comes on - if the engine is not overheating, then in most likelihood a faulty coolant level sensor. In most vehicles, the level sensor is basically a two wire prods that senses the level by the conductivity of the coolant (water). A way to test is to deliberately empty the coolant reservoir (where most level sensors are) and determine if the Low Coolant Light lits up. If yes, try jumping the two wire prods and see if they still lit up. If yes, then sensor are defective. In some instances, it may simply require cleaning (wire prods) to be more sensitive to the water's conductivity, while in others, it could be a loose connector anywhere along the harness/wire from the said sensor.
Pls post back result(s). Good luck and than you for using FixYa.

Posted on Jan 23, 2009

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The "cool down noise" is your engines way to prevent itself from blowing up, that's what you get for having a nice car, lucky you.

The fault sounds like a faulty water level sensor. Also check the oil level. All levels should be at MAX line when the engine is cold.

Another problem may be a blocked hose though at 51,000 miles this shouldn't apply.

Or maybe a broken or seized thermostat valve.

Posted on Jan 23, 2009

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The low coolant sensor is in the radiator or the coolant recovery tank, these sensors are well known to give a false signal of low coolant level, I have replaced dozens of them over the years, the ticking is the exhaust system is from the Catalytic Converters in they exhaust system, they get up to 1200 degree's F when the engine is running to help clean up the exhaust, the tick is the noise the sheet metal of the Converter makes as it cools down, this takes 10-20 minutes, this nothing to worry about, all cars with this part do this to some degree.

Posted on Jan 23, 2009

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The ticking sound is absolutely normal for this vehicle after running, that's just the exhaust system cooling down these cars run very very hot. The LOW COOLANT light is most likely due to a malfunctioning float/sensor that on coolant reservoir bottle either the float/sensor in coolant bottle is STUCK to the bottom of coolant and therefore giving a FALSE reading and putting the LIght ON. Have float check and make sure that sensor is NOT disconnnected/pliged out. To proper check remove coolant reservoir and make sure float is moving up and down when you shake with antifreeze in bottle. Its it stuck once to get it moving and plug in reconnect this light should GO OUT. Good Luck and contact if you need more help. Thanks for using FIX YA

Posted on Jan 23, 2009

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Good Morning. Let me give you some info to take to your mechanic. I worked on Jags for years.

You Low Coolant light is on because the sensor for the coolant level is either stuck in the lower (closed) position, or it is internally shorted, which causes the light ot illuminate. To rectify the condition, have your guy order and replace the Coolant Level Sensor.

No, to the ticking noise. The re is a lot of things that get hot under the car, the exhaust pipes, and the various shields that protect the body from said hot pipes. Some of the shields are stainless steel. When heated, and then cooled, these shields make a "Ticking" noise as they cool off and contract a bit.
This is a normal condition.

I hope that this helps you out. I am sure that my suggestions will rectify the coolant light. Nothing to change/replace on the tick noise. Thnak you for choosing FixYa for assistance. Have a great day, and please get back to me when you get the sensor changed. I'd really like to hear you tell me that it is fixed, and you dream car is happy again.

Posted on Jan 23, 2009

  • Toyota Ed Jan 23, 2009

    Gail, an additional advisory: I do not recommend that you shake the coolant bottle, nor do I recommend that you check the coolant levelk with the engine hot. You could get severly burned.

    Leave these things to your mechanic.Please.

  • Toyota Ed Jan 23, 2009

    "No leaking of antifreeze. The antifreeze has been topped off, small amout, twice. The engine indicator steeps to midline within 15 minutes of driving the car,it doen's go over the midline, though the low coolent light stays on.".......



    The temperature gauge is reading normally, at the midline.

    The time factor for the temp gauge to come up is about right.

    That would eliminate any of the "guesses" regarding blocked pipes, blocked or seized thermostat valves and the like.

    Finally, the comment about about the "engine protecting itself from blowing up" is simply absurd.

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Radiator water level should always be checked with the engine hot. There is a sensor in the water/coolant reservoir that turns the light on, and if the engine has not properly been filled with coolant, then the light will come on once the engine has warmed up.

And MrScary was right, a ticking sound is just the metal cooling down (or heating up, then cooling down) unless the sound is coming from a coolant leak splashing and steaming off a hot surface in the engine compartment.

Posted on Jan 23, 2009

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Gail that is normal or at least semi normal.... there may be an issue with air in the system ... you haven't mentioned it overheating or any obvious leaks.... top up the antifreeze using the extra tank mounted on one of the sides of the engine compartment and keep and eye on that level.... any white smoke from the exhaust as well ?

Robert

Posted on Jan 23, 2009

  • Roberta Smith
    Roberta Smith Jan 23, 2009

    Toyota Ed has given you excellent advice... but i am still curious as to know what colour the exhaust smoke is.



    Robert



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Welcome to Fixya! The ticking sound is Correct and will not hurt anything at all. The Light on the Dash Could be caused by a Clogged Radiator or a Slow Water Pump. I would have these Checked out to see if they are ok.

Posted on Jan 23, 2009

  • Travis Humphries
    Travis Humphries Jan 24, 2009

    No Problem! Happy To Help!

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