Question about 2001 Jaguar XJ8

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Car over heating. tempature gauge fluxuates

Need locate radiator cap to check fluid

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  • Jaguar Master
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Your overheating problems can have several possible causes.
1) Airlock in heating system - solution - bleed air from cooling system. Method is dependent on make/model of vehicle
2) Radiator blocked - solution - drain and flush radiator
3) Failed waterpump - solution - fit new waterpump
4) Engine thermostat stuck in closed position - solution - fit new thermostat
5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors
6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage.
7) Faulty temperature gauge giving incorrect reading

Posted on Jun 21, 2009

  • Radio Code Pro
    Radio Code Pro Jun 21, 2009

    To add: On the XJ8 new coolant goes into an expansion tank in the engine bay and not into the radiator itself. There is NO CAP on the radiator. This webpage shows an image of the expansion tank. The blue and red circles show pipes taking coolant to and from the engine http://www.go-lpg.co.uk/XJ8_Expansion_Bo...

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I have a 2001 S-type. the temp guage will peg to hot very quickly and then will return to normal within a couple of minutes after stopping. The A/C is off. I have checked fluid level which is fine, and no signs of a water leak. My question is since the needle will peg very quickly could this be a thermostat. I am currently 120 miles from a competent garage. It is the 4.0 model

Posted on Jul 22, 2010

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I replaced my water pump for my 2006 buick lucerne and now theres no heat


Hope you didn't break a nail.

There is a air pocket in the heater core, you just didn't burp it right.

Try this

  1. Open the hood of your car. Secure the hood with the safety handle. If you have a newer car, you should have a bleeder valve on the front of your radiator. Check in your owner's manual for the location of this valve. If you do start your car, open the valve with wrench and let your car heat up. The excess air will bleed out of your cooling system. Keep your car on long enough to give the (trapped air) time to bleed out of your system.
  2. Let your car cool down. Once the car is cool, take off the radiator cap. Did the level of the radiator fluid go down? If it did, it means you bled the air out of your cooling system. Replace the radiator fluid, turn on the car, and let it run. Replace radiator fluid as needed.
  3. Step 3 (above) is the way you will remove air from your cooling system if you do not have a bleeder valve on your radiator. You will leave the cap off the radiator. You will run your car until it heats up. As the air dissipates, the radiator fluid level will go down. You will fill up your radiator fluid to the correct level. Be careful because the heated radiator fluid will be hot. Always wear leather gloves and safety goggles when working on your radiator.
  4. Once the air dissipates and you fill the fluid, shut off the car. Let the car cool down. Once the car is cool, put the radiator cap back on the radiator. You may have to put more radiator fluid in the radiator. The level may fall as the car cools down. Now it is safe to drive your car. You have removed the trapped air from your cooling system.
Tips:
Always wear gloves and safety goggles when working on your radiator.
Radiator fluid gets very hot when heated.
Check radiator fluid periodically.

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