Question about Jaguar S-Type

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I own a 2002 Jaguar S-Type 4.0. It started overheating 3 weeks ago. Water pump, coolant reservoir, radiator, and heater control valve have all been replaced. Thermostat changed twice. Cooling fan is operating. No visible leaks anywhere. Bled and filled engine block via thermostat housing with coolant. Still same issue. Can only drive 5 blocks before engine gets hot. Have to pull over and turn engine off immediately to allow it to cool before attempting to get back home. Somebody out there, please help me????

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  • Candy Ratcliff Apr 26, 2010

    I've heard that you can buy a tester kit at an auto parts store. Is it really hard to change a head gasket??

  • Candy Ratcliff Apr 26, 2010

    Thank you so much, emissionwiz. I appreciate your reply to my post. I shall take your advise and run with it. I was totally at a loss!! You're great!!

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  • Jaguar Master
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You have done everything I would do at the shop except for one thing, this is to take the car to a shop with a gas analyzer and have the cooling system checked for combustion gases in the cooling system, this test is best performed cold, U don't always have coolant in the oil when a head gasket is blown, in fact it is something I only saw on a few cars, the reason that an engine overheats so quickly with leaking head gaskets is this, combustion gases get pushed into the cooling system during the power stroke, this forms gas bubbles and gas doesn't transfer heat away from the engine, so have the test run to see if this is the case, based on my experience with Jags 4.0 it Will be the problem.

Posted on Apr 26, 2010

  • yadayada
    yadayada Apr 26, 2010

    on this car replacing a head gasket is a job for a Jag shop, it takes special tools and a very high level of skill, it is a very complicated engine, setting the camshaft back up is where the problem's lie for the DIYer. Yes you can buy a PH kit to check the coolant, the exhaust gases in the system will make the coolant acidic, I still think the gas analyzer test is worth the money, it is much easier to do and more accurate.

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